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.
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