Infinity Quantum 5 loudspeakers

 Infinity Quantum 5

Hard to believe until you hear it  - and even then; that a moderately-sized speaker at a most reasonable price can house the most advanced high-and low-frequency drivers (plus a high-definition midrange dome) and set them free to operate in all their realism.

That's the beauty of the Quantum 5 by Infinity.

Our superlative EMIT and the revolutionary Infinity -Watkins Dual-Drive Woofer are vital ingredients of our formidable Quantum reference Standard speaker-and-equalization system priced at several thousand dollars.

Now the Quantum 5 - at a small fraction of the cost of the Quantum Reference Standard  - has an EMIT and a dual-voice coil woofer of its own. And a sound that would be a revelation from any size speaker, at any price.

IN a woofer, two voice-coils are better than one. In performance, our dual-voice-coil woofer is better than any other.

Impossible combination: good transient response, sufficient power, acceptable efficiency, and extended bass range - all from an enclosure of reasonable size.

Now Infinity brings you Wiliams Watkin's ingenious solution to problems of a speaker's fundamental resonance, back-EMF, and the resultant impedance peak.

The Infinity-Watkins Dual-Drive Woofer, available only in Infinity's Quantum Series speakers, works like this.

In the frequency range where rising impedance and falling response were considered inevitable, a second voice coil takes over. In the region of resonance, it presents a low impedance path to the amplifier.

Now back-EMF is reduced, so the speaker can make use of the amplifier's power at low frequencies. Now it isn't inherent resonance but input that controls the cone. Now extended bass response co-exists beautifully with accurate transient performance. Now the superb bass reproduction of the dual-voice-coil woofer is yours in a reasonably priced compact speaker, Infinity's marvelous Quantum 5.

Is this any way to treat a revolutionary woofer?

In our top-of-the-industry Quantum Reference Standard, the Watkins is the Oscar Peterson of woofers; it can loaf, and still out-perform the rest of the world. It is responsible for response only from its phenomenal floor of 18 Hz to an easy 100 Hz/

As used in the three-way Quantum 5, the revolutionary woofer handles a frequency range from 30 through 600 Hz. So we give the cone a special treatment to increase greatly its stiffness-to-mass ratio. This damping treatment eliminates a variety of circumferential modes and resonances that blur the bass and muddy the midbass in ordinary speakers. Low-frequency reproduction from the Quantum 5 is exciting in its combination of clarity with power. In the vital midrange, Quantum 5 uses Infinity's high-definition dome driver. It is exceptionally accurate in its range from 600 to 4000 Hz. And from 4000 Hz up - far up.

The superlative, soaring EMIT - clearly superior to domes and cones. And electrostatics.

In theory, the magnetic counter-part of the electrostatic tweeter would be just as clean, accurate, and high-ranging as the electrostatic - and trouble-free besides.

In fact, our exclusive EMIT with its magnets of the rare-earth substance Samarium Cobalt, the most powerful magnetic material on earth, is all of that and more.

The EMIT exhibits nearly perfect horizontal dispersion - clearly superior to electrostatics' narrow beaming of high frequencies. And EMIT, more than either electrostatics or conventional dome drivers, is capable of reproducing every transient peak, every fortissimo as accurately as every subtely in the most demanding recording. Listen.

IN scientific measurements and, more important, in listening tests, EMIT stays smooth as high as your ears can follow. beyond that, they keep going right up to 32,000 Hz. Infinity invented the Electromagnetic Induction Tweeter. And only Infinity offers you its advantages. It's standout technological advance and it blends beautifully with the midrange dome and Watkins woofer - thanks to Infinity's meticulous attention to crossover technology and phasing.

The resulting output of a Pair of Quantum 5 speakers has an almost pictorial depth. You place each musician or section front or rear, as well as left or right, as naturally as at a concert.

Specifications

Frequency Response:  38 through 32,000 Hz ±3 db

Horizontal Dispersion:  -2 dB 60°  left and Right (20 kHz)

Suggested for use with amp. or receivers of:  30 Watts to 250 watts per channel RMS

Nominal Impedance:  4 Ω 

Drivers

LF :  300 mm (12") Infinity-Watkins Dual-Drive Woofer

MR:  38 mm (1-1/2") high-definition dome midrange

HF:  EMIT tweeter

Crossover Frequencies:  600 Hz and 4,000 Hz

Level Controls: Midrange and Tweeters

Dimensions (H x W x D):  670 x 380 x 300 mm (26-1/2" x 15" x 12")

Weight (packed):  25 kg (55 lbs)

Finish:  Oiled walnut veneer or particle board;

Grille:  Black cloth removable grille.

Infinity Quantum 4 loudspeakers

Infinity Quantum 4

The sound of this smallest floorstanding speaker in the Quantum Series is eloquent. It clearly proclaims that with Infinity, a music-lover who has to compromise on the cost of elements of an audio system doesn't have to suffer equal compromises on quality.

In 1976 our Quantum Line Source (height, well over five feet price well over $1000) set a whole new industry standard with the first use of superlative EMIT tweeters and the Infinity-Watkins Dual-Drive Woofer, among other advances.

 Now The Quantum 4 (much smaller size, much lower price) seems certain to set the new standard for compact three-way speakers, with an EMIT and dual-voice-coil woofer ot its own. Among other advances.

What two voice coils do for our remarkable woofer.

It has always been impossible to get good transient response, sufficient power, an acceptable level of efficiency and extended bass range from an enclosure of reasonable size. Till now.

Now William Watkins has found, and Infinity has made excellent use of, the solution to problems of a speaker's fundamental resonance, back-EMF, and the resultant impedance peak. Watkins's invention, available in Infinity speakers and no others, is a woofer with two voice-coils, called the Infinity-Watkins Dual-Drive Woofer. It works like this:

Down among the frequencies where rising impedance and falling response were inevitable before, the second voice-coil takes over. In the region of resonance, it presents a low impedance path to the amplifier.

Now the speaker can make use of the amplifier's power at low frequencies, because back EMF is reduced. Now input rather than inherent resonance can control the cone. Now extended bass response and accurate transient performance can co-exist beautifully. Now you can enjoy the superb reproduction of the Dual-Drive Woofer in a compact speaker, the Quantum 4.

Is this any way to treat a revolutionary woofer?

In our top-of-the-industry Quantum Line Source, the Infinity-Watkins is the Oscar Peterson of woofers; it can loaf, and still out-perform the rest of the world. We've made it responsible for response only from its phenomenal floor of 18 Hz to an easy 200 Hz.

As used in the Quantum 4, the revolutionary woofer handles a frequency range from 30 through 600 Hz. We give the cone a special treatment that greatly increases the ratio of its stiffness to its mass. This damping treatment eliminates a variety of distortions, circumferential modes and resonances that otherwise could blur the bass and muddy the midbass. And low frequencies from the Quantum 4 are exciting in their combination of clarity with power.

Next up in the Quantum 4 array of drivers is Infinity's high-definition dome midrange driver. In its range from 600 to 4,000 Hz it speakers nothing but the accurate truth. And above all.

EMIT - the eminent exclusive tweeter that stays smooth as high as your ears can reach - and beyond.

Infinity wrote the book on the electrostatic tweeter. It was a story of triumph over adversity. Now we/ve gone the electrostatic on better.

Electrostatics, with their low-mass diaphragms driven uniformly overall, delivered sweet undistorted reproduction of high frequencies. But they were subject to voltage break-down and tended to "beam" sound narrowly.

Our dream of creating a trouble-free magnetic counterpart of the electrostatic became a beautiful reality after we hit on the use of the magnetically powerful rare-earth material called Samarium Cobalt.

now our EMIT - with Samarium Cobalt magnet provides gloriously accurate and musical high-frequency performance minus the limitations of electrostatics, plus nearly perfect horizontal dispersion and high power capability, clear up to a superauditory 32,00 Hz.

EMIT tweeters are used in Infinity speakers. And in no other speakers in the world.

In the Quantum 4 the Dual-Drive Woofer, dome midrange driver, an EMIT, and Infinity's meticulous attention to phasing and crossover technology join together to produce startlingly lifelike stereo imaging and depth.

The sound of a pair of Quantum 4 speakers would be a joy no matter what size enclosures or what price instruments it came from, From compact speakers in the Quantum 4 price range it is a revelation .

specifications

Frequency Response:  35 through 32,000 Hz ± 3 dB 

Horizontal Dispersion:  -2 dB 60°  left and Right (20 kHz)

Minimum Rec. Amp. Power:  30 Watts per channel RMS

Maximum Rec. Amp. Power:  250 watts per channel RMS

Nominal Impedance:  4 Ω 

Drivers

LF :  12" Infinity-Watkins Dual-Drive Woofer

MR:  1-1/2" high-definition dome midrange

HF:  EMIT tweeter

Crossover Frequencies:  600 Hz and 4,000 Hz

Level Controls: Midrange and Tweeters

Dimensions (H x W x D):  910 x 380 x 300 mm (36" x 15" x 12")

Weight )packed):  41 kg (90 lbs)

Finish:  Oiled walnut veneer; removable grille.

 

Infinity Qb loudspeakers

State-of-the art. Technology is what sets the Qb far ahead of anything else in its range of reasonable size and price.

Three advanced drivers combine their linear output so accurately that the recorded musicians "appear" arrayed left to right and front to back, between, beyond and behind the speakers. The stereo imaging of a pair of Qb speakers is true - and truly awesome.

One big reason is our exclusive little EMIT - infinity's Electromagnetic Induction Tweeter. The superlative EMIT was utilized first in our Quantum Line Source speaker. Our EMIT,, plus an accurate and efficient midrange driver, plus our advanced new Q-woofer reproduce the entire frequency range from 42 Hz through a super-auditory 32,000 Hz with utter realism. And with as little as 15 watts per channel.

 

EMIT: demonstrably superior to domes and cones = and electrostatics

Like the finest electrostatic tweeters, Infinity's Electromagnetic Induction Tweeter has an extremely low-mass diaphragm, driven uniformly over its effective radiating area - not locally, as cones and domes are driven

Like electrostatics, the EMIT is highly responsive to high frequency transients in the music.

Unlike electrostatics, our exclusive EMIT displays vastly superior dispersion and power handling capability. It has the ability to reproduce delicate nuance and powerhouse sounds without distortion. The superlative EMIT, a significant advance over conventional tweeters, has previously been used only in Infinity's more expensive Quantum family of speakers. Now you may enjoy its sweetness, range, and accuracy in our lower-priced Series Q speakers.

In the interest of true stereo imaging. Infinity has devoted unusual care in the design of the Qb to the area of crossover frequencies (600 and 4000 Hz) and to balancing the output of our four-inch midrange and EMIT and woofer drivers.

 

A new technological advance Q-woofer

Infinity's new bass driver varies the mass of its moving element with frequency. At low frequencies the specially treated woofer cone is coupled to its butyl surround for extended response. As frequencies rise, the light cone mass is progressively uncoupled to improve transient response and raise efficiency in the upper bass range.

The butyl surround more effectively absorbs waves that reflect in conventional woofers, muddying and coloring their output

The voice-coil former, or bobbin, is of phosphor bronze. Like the aluminum traditionally used, it helps dissipate heat, but unlike aluminum it does not create reverse eddy currents that slow down rise-time. The result is noticeably better transient response. And the voice-coil is unusually long, allowing long excursions while maintaining linearity.

You don't listen to a pair of Qb speakers. You listen to the live performance through them

When you comparison-test the Qb against any other speakers near its price, do this: Raise the Qb off the floor, as its optional pedestal does - but don't hem it in between bookshelves. As with all good speakers, the Qb should be placed a couple of feet  away from the wall. Use familiar records. Switch between speakers frequently. And prepare for something that happens again and again. After a sample of the sheer realism of the Qb by Infinity, other good-to-excellent speakers begin to sound simply wrong.

 

A pair of Qb speakers "open up" all kinds of music in all frequency bands, and reveal a very real sense of depth. And you realize you've heard sound this realistic somewhere before - but not from speakers. Oh, maybe from more expensive Infinity speakers, but certainly not from anything close to the sensible price of phenomenal Qb

 

Specifications

Frequency Response:  42 - 32,000 Hz ±3 dB

Horizontal Dispersion: -2 dB at 60°,, left or right (20 kHz)

Suggested for use with amplifier or receivers of :  15 to 150 watts per channel rms

Nomnial Impedance:  4 Ω

Drivers

LF :  10" Q-woofer

MF :  4" midrange

HF :  EMIT tweeter

Crossover Frequencies:  600 and 4000 Hz

Dimensions(H x W x D);  630 x 370 x 300 mm ( 25" x 14-1/2" x 12")

Weight :  19,5 kg (43 lbs) shipping

Finish:  Birch grain vinyl on particle board

Grille:  Brown cloth, removable

 

Infinity Qa speakers

The new Qa, our lowest priced speaker, has actually been compared to our formidable (and formidably expensive) Quantum Line Source.

Small wonder, Qa was conceived with much of the same advanced technology and all of the same commitment to excellence that gave birth to the QLS. In both speakers you'll find our exclusive EMIT electromagnetic induction tweeter, originally developed for the QLS, EMIT achieves a super auditory 32,000 Hz with extraordinary power and wide dispersion. Our technologically advanced Q-woofer delivers a tight, clean rock-solid 42 Hz at the bottom.

Yet Qa can be driven with as little as 15 or as much as 150 watts per channel (wherever you're at with amp power, Qa is there , too)

The proof is in the listening, qa is everything you'd expect from Infinity.

 

The Landmark EMIT

EMIT - Infinity's exclusive new electromagnetic induction tweeter is a significant advance in the technology of high frequency transducers. You'll find EMIT in our Quantum Line Source. You'll also find it in Qa.

The magnetic analogue of an electrostatics - as well as to cone and dome drivers. EMIT radiates sound from an ultra-thin and light plastic film diaphragm. Because it is driven over all of its effective radiating area, it is always controlled by the input signal. And because it is lightweight, it can be controlled accurately and precisely, providing a smooth, extended frequency response and excellent transients.

Performance of cone and dome drivers, on the other hand, is inherently limited by their technology.

Driven locally by a voice coil, accurate control of the radiating area is limited by the cone/diaphragm stiffness, as well as by its weight. Cones and domes therefore are limited in their transient response and in their ability to effectively couple to the air. These limitations are most evident at high frequencies.

EMIT, with a low-mass diaphragm driven over its entire area by powerful magnets of rare-earth Samarium Cobalt, achieves superior levels of transient response and accuracy.

Musically, this translates into a clarity and transparency, a filigree-detailing of mid and high frequencies that is unsurpassed by any other driver in the world.

EMIT is sound years ahead of other drivers in other ways as well. Its phenomenal power capacity derives from several EMIT ingredients; its impedance, which is almost pure resistance, allowing the amplifier to drive it more easily; a unique "voice-coil" which is etched directly onto the surface of the diaphragm, allowing efficient heat dispersion - all of these result in a speaker that can reproduce exceptionally high sound levels.

Wide dispersion is another Emit benefit. Its one-half-inch wide radiating source achieves wide horizontal dispersion through the highest audible frequencies.

As you can hear for yourself, EMIT gives Qa a combination of subtle delicacy, sledgehammer power capacity and dispersion never attained by either electrostatics or by conventional dome drivers.

 

Our Q-woofer

You'll find advanced Infinity technology in our Q-woofer as well. A specially-formulated QX™ material damps out spurious resonances that cause coloration in other cone drivers. Our low-mass, high-excursion Q-woofer delivers tight, extended and startlingly accurate bass as well as extraordinary midrange - the kind of midrange associated with 3 and 4-way systems.

A heavy butyl surround couples its mass progressively to that of our light weight Q-woofer cone ay low frequencies. This result in superior transient performance in the upper part of the woofer's range without sacrifice of low frequency response.

A unique voice-coil former, or bobbin, in the woofer is of phosphor bronze. Like the aluminum traditionally used in voice-coil formers, this metal aids in heat dissipation; but it avoids the reverse-eddy currents that slow down rise-time.

Therefore the rise-time of our Q-woofer is extremely fast, bass transient response is phenomenally accurate.

 

Enough about means

Listen to the end result. Test Qa in an Infinity dealer's showroom against the toughest musical parameters; the breadth and sweep of the Horenstein Mahler Third on Nonesuch, the slashing brass of McConnell on Umbrella, the introspection of Almeida on Crystal Clear, the transparency and three-dimensional depth of Randy Sharp on Nautilus.

Then listen to your own favorite and familiar records through Qa. We guarantee you'll be hearing them for the first time.

 

About Power and Positioning

The Qa was designed to be suitable for low-powered amplifiers. Yet if you have a $10,000 system you'll find that Qa can handle your highly-powered amp - to and beyond any comfortable living-room listening level. Put a pair of Qa's in your study as second speakers (then don't be surprised when you start spending more time in your study.)

A word about placement. Don't hem in the Qa between bookshelves, but  do raise it off the floor. Our optional pedestals do the job easily and optimally - about twelve inches worth. And when you place these speakers a couple of feet away from the well, remarkable things happen;

A sense of spaciousness will "appear" around the musicians; all frequencies will "open up" with a very real sense of depth; no voices or instruments will be thrust unnaturally forward from the speakers or made unnaturally larger than reality - but those musicians farther away during the original performance will be perceived as farther from the listener.

This spatial imagery and total musical honesty is characteristic of our most expensive Infinity speakers; and now, of our least expensive speakers as well.

In fact, the Qa has everything you'd expect from Infinity.

 

Specifications

Frequency Response:  42 Hz through 32 kHz ±3 dB

Horizontal Dispersion:  -2 dB at 60°, left or right (20 kHz)

Suggested for use with amplifier or receivers of"

15 through 150 watts per channel rms

Nominal Impedance:  4 ohms

Drivers

1 x 250 mm Woofer

1 x EMIT tweeter

Crossover Frequencies:  2,5 kHz

Level Control:  Tweeter control

Dimensions (H x W x D):  630 x 370 x 300 mm (25" x 14" x 12")

Finish: Birch grain vinyl on particle board

Grille:  Brown cloth, removable

Weight (packed):  18 kg (40 lbs)

 

Infinity Quantum 2 speakers

 

Where in the world can you hear the revolutionary woofer with the dual voice coil? Only in Infinity's Quantum Series. Our Quantum Line Source speaker reaches down to 18 Hz.

Here in its closest competitor, the Quantum 2, it goes to 24 Hz - nut you get an extra 2 dB of efficiency.

And where will you find the satiny sounding Electromagnetic Induction Tweeter (EMIT)/? Only in Infinity's Quantum Series.

The Quantum Line Source stacks them four feet high. The slightly more compact Quantum 2 uses the same tweeters, but not quite so lavishly.

In between those extraordinary, exclusive low and high drivers, both QLS and Q2 use Infinity's high-definition 1-1/2-inch dome midrange driver and transmission-line midbass coupler.

 

What comes out of the Dual-Drive Woofer is a new bass experience

Everybody knew for years it was impossible to get acceptable efficiency, good transient response, enough power, and extended bass range out of any enclosure of reasonable size. So every speaker system in the world represented a serious compromise of one or more of those desirable characteristics. Until, William Watkins found the solution to problems of the speaker's fundamental resonance, back-EMF and the resultant impedance peak. He invented a woofer with two voice coils. Right down where rising impedance and failing response were inevitable before, his second voice coil takes over, presenting a low impedance path to the amplifier in the region of resonance.

Now the speaker can make use of the amplifier's power at low frequencies, because back-EMF is reduced. Now input rather than inherent resonance can control the cone. Now extended bass response and accurate transient performance can co-exist beautifully. The bass driver that makes all this happen is called the Infinity-Watkins Dual-Drive Woofer. It is one of the significant audio advanced that set Infinity's Quantum Series apart.

 

Infinity EMIT is like the sweetest of sopranos without a trace of temperament

Working for years to perfect the electrostatic tweeter for what became our $4000 Servo Statik 1A speaker system, we dreamed of creating the magnetic counterpart of the electrostat. Without any of the same problems of breakdown or need for a transformer. With the same advantages of a low mass diaphragm driven uniformly overall. If only there were a magnet powerful enough. We finally found our magnet, made with the rare-earth material Samarium Cobalt, four to seven times more powerful than the finest alnico magnet.

And then we found we could make a tweeter that was not only easier to control than the electrostatic, but also easier to listen to. With admirable range and realism and nearly perfect horizontal dispersion. This new breed is named EMIT Electromagnetic Induction Tweeter Audio technicians esteem it technically. Music-lovers love it instantly.

 

More than merely a revolutionary woofer and superlative tweeters

High-definition 1-1/2" dome drivers reproduce the midrange in the Quantum Series. And in the midbass (200 to 600 Hz), where about half of all musical fundamentals lie, we felt it vital to provide our Quantum 2, like our Quantum Line Source, with a driver that could speak with absolute accuracy. The answer is our meticulous midbass coupler.

We at Infinity have strong feelings and a goodly store of savvy about phasing and crossover technology. The finest fruits of our stubbornness and know-how are the startlingly lifelike stereo imaging and depth that our Quantum Series speakers produce.

 

Specifications

Frequency Response:  24 Hz - 32 kHz ±3 dB

Horizontal Dispersion:  -2 dB at ±60°, 20 kHz

Suggested for use with amplifiers of 45 through 350 watts per channel RMS

Nominal Impedance:  4 ohms

Drivers

12" Infinity-Watkins Dual-Drive Woofer

4" midbass coupler, transmission-line loaded

Two 1-1/2" dome midrange, specially treated

Three EMIT tweeters

Crossover Frequencies:  200 Hz, 600 Hz and 4000 Hz

Controls:  Level for midbas coupler, midrange and tweeters.

Variable crossover point for tweeter

Dimensions (H x W x D):  1240 x 460 x 330 mm (49" x 18" x 13")

Finish:  Oiled walnut veneer, Removable grille

Weight:  63 kg (138 lbs) packed

Infinity 7 Kappa loudspeakers

 

A New Generation Of High Accuracy Technology

The Kappa woofer has a highly innovative cone that is injection molded from a mixture of graphite fiber and polypropylene. The advantages of these two materials - graphite for its stiffness and polypropylene for its inertness - compliment each other. During the high pressure injection molding process, graphite fibres are forced into the polypropylene in a radial pattern. This composite structure exhibits extreme stiffness and pistonic operation up to nearly 1 kHz, low mass, fast acceleration and very high self damping. The result is taut, precise bass reproduction at all volume levels, with sufficient bandwidth to permit very smooth transitions to midrange drivers. We use the same composite cone (and the rigid cast frame of the heavier 12" Kappa woofer) in our no-compromise Infinity Reference Standard, Series V and we believe that it is the most accurate cone made - at any price.

Our revolutionary Polygraph k superwoofer handles the critical mid-bass and lower midrange frequencies. The spectrum of 80 Hz to 800 Hz where half of all musical energy appears and where most speakers are at their weakest. This new 5" dome-shaped driver operates throughout this range and delivers a seamless, coherent performance. Allowing voices and instrumental textures to emerge with an airiness and clarity that is musically convincing.

Diaphragm construction on the Polygraph k is more akin to that of a grand prix car than a loudspeaker. It is a composite structure, made from unusually thin polypropylene supported by an extremely stiff lattice of graphite fiber. These two materials provide an unprecedented combination of stiffness, low mass and damping. The Polygraph's transient response and resistance to breakup rivals that of the most expensive planar drivers. Its power handling and dynamic range surpass them.

The equally important upper midrange frequencies are covered by another new dome design. Our 3" Polydome k uses an edgewound voice coil for high electrical efficiency and a new formulation of soft polypropylene for a combination of excellent self damping and speed. Our research paid off in a driver of exceptionally low coloration. This dome mates beautifully with the potent Polygraph k and, because of its size, can go low enough to meet the 10" and 12" kappa woofers in our more affordable 3-way systems.

The higher frequencies still belong to our famous EMIT electromagnetic induction planar tweeters. Now, however, there are two of them, and both feature evolutionary improvements first used in our IRS, Series V.

 

Compared to its predecessor, the Kappa EMIT has a kapton diaphragm of approximately half the mass, a lighter, thinner aluminum trace (analogous to the voice coil on conventional cones and domes) and new ultra-linear, ultrahigh gauss rare neodymium magnets. High frequency response has been extended to 44 kHz, and though you won't hear fundamentals up there, you'll find that kind of bandwidth makes a difference in reproducing transients and instrumental attacks. In our more expensive 8 k and 9 k loudspeakers two of these EMIT k's are used - one in front and one in the rear - for true dipolar dispersion and superior imaging.

 

Reference Standard 7 Kappa

The 7-Kappa is a stylish 12" three-way floor standing loudspeaker system. It's cast frame woofer utilizes our graphite fiber reinforced polypropylene cone coupled directly to the superb Plydome k, a 3" soft polypropylene dome. And improved EMIT k tweeter uses the same light diaphragm and neodymium magnets as our other Kappa speakers. These drivers are housed in a handsome cabinet which, with its rounded front and rear vertical edges, looks right at home with the finest furnishings. This combination of larger woofer and greater cabinet volume provides deeper, more powerful bass than the 6 k, along with greater power handling and dynamic range. The enclosures modest footprint contributes to ease of placement - even in confined living quarters.

 

Specifications

Frequency Response:  37 Hz - 45,000 Hz +3 dB

Crossover Frequencies:  800 Hz, 4500 Hz

Power Rating:  40 - 200 watts RMS

Sensitivity:  88 dB at 1 watt/1 meter

Nominal Impedance:  4 to 6 Ω

Drivers

1 x EMIT k tweeter

1 x 3" Edgewound Voice coil Polydome k midrange

1 x 12" Graphite/Polypropylene woofer

Dimensions (H x W x D):  37" x 17" x 12"

Weight:  31,4 kg (shipping)

Infinity 6 Kappa loudspeakers

Kappa is a concept and group of products. Five unique drivers and four loudspeakers that incorporate them. Kappa speakers differ radically from conventional speakers in appearance, underlying design philosophy , and certainly in performance.

Woofer.

A newly developed composite polypropylene/graphite fiber injection molded cone enables Kappa woofers to produce powerful, taut bass.

Mid-range

Utilizing a 3" edgewound voice coil and a powerful magnetic structure, the new Polydome k midrange driver delivers low distortion, exceptional linearuty and fast transient response.

Tweeters

New neodymium magnets and a special ultralight diaphragm extend the EMIT k tweeter's bandwith to beyond 44 kHz. The result is incredibly fast transients within the audible frequency ranhe.

Network.

Kappa crossovers are computer designed, then carefully handtuned during critical listening sessions. Components are chosen for their electrical excellence and musicality.

 

Reference Standard 6 Kappa

The 6 Kappa is a monitor-size loudspeaker that performs properly on the bookshelf or, with its optional pedestal, the floor. Low frequencies are reproduced by our 10" graphite/polypropylene woofer, mids are handled by our new 3" Polydome k and high frequencies are handled by our improved EMIT k. in virtually all aspects of performance, aside from extreme bass extension, the 6 k surpasses European and American monitor systems costing up to three times the price. The linearity of its Kappa drivers and their integration - through a high quality computer optimized crossover network - provide for notably higher resolution than is possible with conventional drivers. The 6 k is a fitting complement to the best electronics and signal sources and forms the foundation of an affordable perfectionist audio system.

 

Specifications

Frequency Response:  39 Hz - 45,000 Hz +3 dB

Crossover Frequencies:  800 Hz, 4500 Hz

Power Rating:  30 - 150 watts RMS

Sensitivity:  88 dB at 1 watt/1 meter

Nominal Impedance:  4 to 6 Ω

Drivers

1 x EMIT k tweeter

1 x 3" Edgewound Voice coil Polydome k midrange

1 x 10" Graphite/Polypropylene woofer

Dimensions (H x W x D):  25" x 15" x 10,5"

Infinity ES-1 headphones

The most acurate headphones ever created. That was the goal.

When Infinity's scientists set out to develop such a stereo component, we determined to start from the highest achievement to date in headphone reproduction - electrostatics - and to remove the previous limitations of electrostatics.

The ES-1 Headphone System demonstrates that accomplishment. And no longer are the finest headphones any less accurate than the finest speakers.

An altogether new diaphragm material is employed in these headphones because it follows dynamic changes much faster and more precisely than the polyester others use. This extremely low-mass material, called Polyurethin, is so responsive as to provide a transient fullness impossible to achieve in the past.

 as a result, Infinity's electrostatic headphones deliver a frequency response of 20 to 25,000 Hz ±2 dB; at a sound pressure level of 100 dB; they show total harmonic distortion of less than 0,3%; their maximum output is a full 118 dB SPL; the realism of their reproduction is startling.

The ES-1 Headphone System consists of one headphone set and the walnut-enclosed adaptor containing power supply and matching transformers. Front-panel output connectors accommodate two headsets; an optional second set is available from your Infinity dealer.

The power supply is to be connected between your amplifier and speakers. Front panel switchingwill let you leave your headphones connected whether you are listening to them or to your speakers. Power supply is also provided with a fast-acting protection circuit to switch off either channel or both in case of overloading that might otherwise damage the unit. A re-set button on the front panel easily puts the circuit back into operation.

Infinity Electrostatic Headphones operate in the push-pull mode, that is, the power amplifier's signal is boosted by the transformer, and constant bias (DC) voltage sets up electrostatic fields which push and pull the diaphragm between two grids.

Infinity coats the Polyurethin of the diaphragms precisely evenly with conductive chemical compounds. The material and the process deliver three benefits:

A high "ratio of extension", the ability to respond to the smallest signal variations and return instantaneously to original tension. Infinity has achieved a marked improvement over polyester, which is 20 times heavier than Polyurethin.

Reduction virtually to zero of the distortion that can be caused when energy is reflected at the suspended edge of a headphone diaphragm.

Voltage spread evenly over the entire diaphragm surface so it will move as a perfect piston with no "hot spots" moving sooner or more than other portions.

As with every Infinity product, the purpose and the result of our using the most advanced technology is to deliver the original, uncolored sound of music exactly as recorded. In the case of the ES-1, you experience a spacious, open quality. Not only can you hear sounds around you (baby's cry, doorbell), but in addition, the music seems to be spread naturally all around you, and not focused unnaturally inside your head.

Your private listening experience with Infinity Electrostatic Headphones will be gratifyingly comfortable, supremely accurate, and totally musical.

Specifications

Frequency Response:  20 Hz to 25,000 Hz ±2 dB

Total Harmonic Distortion:  less than 0,3% at 100 dB SPL

Sensitivity:  98 dB SPL at input of 2 volts at 1000 Hz

Maximum Output:  118 dB SPL

Maximum Input:  50 watts at 100 Hz

Source Impedance:  4 to 16 Ω

External Power Requirements:  117 or 220 volts AC 50/60 cycles, ,01 watts

Headphone Weight:  9 ounces

Headband Adjustment:  11-1/2 to 13-1/2 inches

Headphone Cord Length:  98 inches

Adaptor Size (W x H x D):  5-1/4" x 3" x 7-1/4"

Adaptor Input Cord:  33-1/2 inches

Adaptor AC Cord:  67 inches

Infinity Reference Series 61i

Reference Series The Next Generation

In an era when pride in quality craftsmanship, independent creative thinking and conscientious attention to detail seem to be rapidly vanishing from almost every field of consumer goods, Infinity continues to lavish our unique blend of tender loving care and cutting edge engineering on every loudspeaker that bears the Infinity logo.

Most recently, we turned our attention to the popular Reference Series with an eye toward further elevating the already exceptional level of performance of this fine range of loudspeakers.

The result is Reference Series II - The Next Generation, quite simply one of the finest loudspeaker lines ever introduced. The second generation Reference Series loudspeakers represent substantial improvements in key areas such as efficiency, power handling and in both the quantity and quality of deep bass. One of the major contributing factors to this giant step forward is the introduction of drivers which incorporate proprietary APG lightweight cone technology, allowing them to respond to musical waveforms with amazing accuracy.

With higher efficiency, increased power handling and enhanced low frequency output, the new Reference Series is ready to take on any sonic challenge, from chamber melodies to operatic climaxes, from cheerful Aladdin to fearful Jurassic Park.

The Second Generation Reference Series incorporates:

Space-age APG driver technology with carbon and Kevlar fibers.

Super-light cones for improved sensitivity.

Low insertion loss crossovers for improved transient response.

Increased internal volume for extended deep bass response.

Rear-mounted port for undistorted bass response.

Crossover optimized for uniform phase response both on and off axis.

Internal bracing for reduced resonance.

Strategically placed internal damping to eliminate standing waves.

Sloped cabinet for reduced diffraction.

Redesigned grille for optimum vertical and horizontal dispersion.

Spikes for decoupling of floor-standing models.

Finest furniture craftsmanship. Sleeker, slimmer enclosure design.

APG cone technology

Without a doubt the most revolutionary innovation in the Reference Series is the implementation of a specially formulated graphite coated APG (acrylic polymer graphite) cone which combines the excellent internal damping of acrylic polymer with the stiffness of graphite. Extensive subjective and objective testing confirms that APG represents a major breakthrough in cone materials technology with stunning performance in terms of low distortion, linear frequency response, spacious sound and overall musicality.

The exclusive APG process aligns carbon and Kevlar fibers precisely along the polymer matrix, allowing total control over the contour and weight of the cone, while making it possible to create a lightweight cone with varying thickness, for greater dispersion of sound. Carbon and Kevlar fibers are embedded in an APG matrix in carefully controlled proportions. Following oven heating, the compound forms an extremely rigid, ultra-lightweight and super-strong composite cone material with maximum internal damping which offers a significant reduction in distortion caused by colorations, vibration and break-up modes. The sonic benefits of the fast transient response and high sensitivity of the new lightweight driver cones are readily apparent in the astonishing openness, lucidity and harmonic fidelity of the Reference Series loudspeakers. Their crisp, detailed sound is the result of innovative materials and driver technology unrivalled in contemporary loudspeaker engineering.

High sensitivity

Since APG cones are 30% lighter than paper cones of equal stiffness, Infinity engineers could design the new Reference Series with higher efficiency, without employing heavier, more costly magnetic structures.

The high sensitivity of the Reference Series loudspeakers, with highly efficient magnetic systems, super-light cones and low insertion loss crossovers, means far less work for your amplifier. Since amplifier distortion increases with higher power output, reducing power demands also yields a significant reduction in distortion.

Since lightweight cones respond more rapidly and linearly to transients, the rigid, high-tech cone materials employed in the high efficiency Reference Series dynamic drivers offer enhanced transparency, improved resolution of low level detail and of the ambience cues which create a wide and deep soundstage. An increase of 3dB in sensitivity reduces by 50% the power required from your amplifier to achieve the same sound pressure level.

Sophisticated crossover

The new Infinity Reference Series' low insertion loss crossover networks employ select-grade components in o crossover configuration designed to preserve signal integrity and efficiency.

Crossover design assisted by state of the art. computer technology and controlled by  extensive listening tests ensures optimum linearity combined with lowest distortion and the finest sonic quality.

The high efficiency of the crossovers permits  the use of Reference Series speakers in high power applications, including demanding home theater systems.

Enclosure design

In the new Reference Series loudspeakers  radical steps have been taken to eliminate the "boxiness" normally associated with conventional cabinet construction.

The midrange drivers are installed in separate air-tight compartments filled with special damping material to provide smooth, linear reproduction of the crucial midband.

Internal bracing and damping reduce the deleterious effects of resonances and standing waves. Front baffle diffraction phenomena, which typically introduce smearing in the time domain, are reduced through the implementation of an optimized grille shape and through tapering of cabinet top and sides. Rear-mounted bass reflex ports minimize noise, while providing extended, punchy bass.

The Reference Series speakers in Chatsworth Oak or Black Ash vinyl are finished to the highest standards of furniture craftsmanship and their sleek contemporary "Tower" look will match most interiors.

 Reference 61 i

The top of the line Reference tower includes spikes for effective decoupling from the floor and gold-plated terminals for long-term purity of signal transmission. The Reference 61 i adds a second 210 mm APG woofer to the driver complement found in the Reference 51 i, further extending low frequency response and power handling with two woofer voice coils to share the workload.

The 25 mm APG-coated dome tweeter minimizes break-up of the radiating surface across its operating range for smoother, more natural high frequency response with very low distortion. The mechanically isolated 25 mm unit reproduces the midrange with outstanding clarity and definition.

The Reference 61 i brings music to life with a new fullness and richness.

Note: Include spiked feet.

Specifications:

Model:  Reference 61i

Frequency Response: 35 Hz - 25,000 Hz, (±3 dB)

Crossover:  350 Hz / 3 kHz

Sensitivity (2,83 V / 1m):  92 dB

Nominall Impedance:  6 Ω

Power Handling:  35 - 200 watts

DRIVERS:

High Frequency:  Tweeter  25 mm

Mid Frequency:  Midrange 130 mm

Low Frequency:  Woofer  2 x 210 mm

Vinyl Cabinet Finish:  Chatsworth Oak/ Black Ash

Dimensions (HxWxD):   1070 x 274 x 310 mm

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Infinity Reference Series 51i

Reference 51 i

The Reference Series floor-standing three-way system employs the same driver components and technology as the Reference 41 i, but in a larger enclosure with increased internal volume for deeper, punchier bass. The extended low frequency response and higher levels of clean, solid bass from the Reference 51 i add a more realistic physical dimension to your listening enjoyment, regardless of musical style.

The carefully sculpted tweeter faceplate provides exceptional linearity across the driver's operating range combined with ideal vertical and horizontal dispersion, while the 130 mm midrange unit, installed in its own air-tight compartment, delivers resonant-free spacious sound in this critical frequency range.

Note: Include spiked feet.

Specifications:

Model:  Reference 51i

Frequency Response: 38 Hz - 25,000 Hz, (±3 dB)

Crossover:  400 Hz / 3 kHz

Sensitivity (2,83 V / 1m):  92 dB

Nominall Impedance:  6 Ω

Power Handling:  25 - 150 watts

DRIVERS:

High Frequency:  Tweeter  25 mm

Mid Frequency:  Midrange 130 mm

Low Frequency:  Woofer 210 mm

Vinyl Cabinet Finish:  Chatsworth Oak/ Black Ash

Dimensions (HxWxD):   890 x 274 x 275 mm

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