KLH 354 loudspeakers

KLH has always made fine loudspeakers. It's a tradition. But with the introduction of our new Model 354,, we believe we are adding a new dimension to that tradition. For the 354 is the best of KLH, made even better. Like all of our classic loudsppeakers, it is of acoustic suspension design. It also uses our famous 273 mm extended low-frequency woofer. But the tweeter, midrange and crossover network are all vastly improved devices of completely new manufacture that represent the industry's most advanced technology. Indeed, the 4-1/2" midrange used in the 354 is considered by most experts too be the finest cone-type ever made. The 354 is considerably more efficient than previous models - with an extended top end, more open sound and greater overall musically. It flawlessly recreates the subtleties and innervoices of the orchestra. Stated simply. It is easily one of the best loudspeakers we, or anybody else, have ever made. It is unquestionably the most beautiful - finished both inside and out in a deeply handsome walnut veneer on high-density particle board. Whether you put a pair of 354s on pedestals (optional) or display them with their grille cloths on or off, they are striking and important additions to any home. But for all their richness, they are surorisingly modest in price.

Specifications

Type:  tree-way acoustic suspension loudspeaker system

Impedance:  8 ohms

Frequency Response:  25 Hz - 22,000 Hz

Drivers:

1 x 12-inch low resonance KLH woofer

1 x 4-1/2-inch midrange

1 x 2-1/4-inch cone tweeter

Minimum Recommended Power (per channel):  25 watts RMS

Maximum Power Handling:  can be safely used with amplifiers rated up to 175 watts RMS per channel

Two Rotary Switches - one 3-position midrange control and one3-position tweeter control

Walnut veneer on high density particle board (including baffle)

Removable front grille panel (Hedlok)

Dimensions (W x H x D):  360 x 660 x 320 mm (14" x 25" x 12-6/8")

Weight:  50 lbs (per carton)

KLH-1 and Analog Bass Computer

 KLH-1

The most dramatic expression of computer control technology

Uncompromising. That's as close as any single word comes to describing the performance of the new KLH-1. It is certainly one of the finest speakers ever made. Its twin computer controlled woofers provide flat bass all the way down to 30 Hz (-3 dB). Like the KLH-2 and KLH-3, it has polypropylene cones for a clear, uncolored mid-range and high end - with remarkable smoothness and clarity - and a control that lets you adjust the response for room placement.

The KLH-1 is our largest computer-controlled model. At 11" x 30-1/2" x 10-1/4", though, it's not much larger than most bookshelf speakers. yet the clarity, the openless, the precise stereo imaging, and, of course, the accurate wellcontrolled bass of the LKH-1 can be compared with loudspeaker systems of any size. And at any price.

Audition the KLH-1 against the toughest competition you can think of. With any type of music you like. You simply won't find anything better.

 The KLH Analog Bass Computer, supplied with the speakers is a separate component which connects to your receiver or amplifier. It continually monitors the bass signal and automatically controls woofer excursion as the needs of the music dictate, to prevent, distortion.

The Analog Bass Computer allowed us to design speakers closer to their theoretical performance than ever before.

What this means is a line of speakers that can reproduce clean tight bass equal to optimally designed acoustic suspension speakers four times their size.

In fact KLH computer controlled speakers will outperform comparably prieced speaakers regardless of size. They, finally obsolete the notion that great sound requires great furniture.

 Analog Bass Computer technology is such a big step forward in speaker design, we could have easily quit right there. But we didn't.

After researching a wide range of speaker cone materials, we chose polupropylene - a material first developed for speaker use by BBC engineers.

The movement of the polypropylene cone more faithfully reflects the electrical signal than either paper or bexterne cones. So it reduces coloration caused by "break-up" - uncontrolled cone movement.

The result is exceptional definition and clarity in the midrange - particularly noticeable on the sounds which are most familiar, such as the human voice, hand clapping, and the subtle ambiance around instruments and singers. Of course, we chose the other elements of our speakers with equal care.

Instead of stamped steel baskets to support the speaker cones ours are precision die cast.

Our magnet, assemblies are massive - bigger than those found on much larger speakers.

We even added an acoustically absorbent foam baffle around our high-range drivers, for smoother response and clear precise stereo imaging.

Finally, we use genuine walnut veneers in our cabinet construction. Because we think a speaker should look as good as it sounds.

Specifications:

Designed for vertical use on stand supplied.

1,25 cu.ft./35 litre floor standing speaker system, with Analog Bass Computer.

Optimally designed equalied sixth-order system.

-3 dB at 30 Hz, 105 dB s.p.l. (system in room)

Sensitivity:  87 dB/1W/1m at 1 kHz

Drivers:

Two new 200 mm KLH woofers with polypropylene cones, cast baskets

New 100 mm KLH mid-range with polypropylene cone.

New 25 mm KLH tweeter.

Acoustically absorbent foam on front baffle reduces high frequency diffraction effects, improves stereo imaging and smoothness of response.

Suggested for use with receivers or amplifiers of 2 x 40W to 2 x 200W

Controls:  Computer in/out; tape monitor, Low frequency position compensation; High frequency , and amplifier overload indicators.

Dimensions:

Speakers :  280 x 775 x 260 mm (11" x 30-1/2" x 10-1/4")

Analog Bass Computer :  60 x 270 x 150 mm ( 2-1/2" x 10-1/2" x 6")

Shipping Weight:  57 kg ( 125 lbs)

Finish: speaker finished in genuine walnut veneer - black removable grille. Speaker stands included

KLH Model Five

 Acoustic Suspension Speaker System

The KLH Model Five represents our best efort to make the highest level of loudspeaker performance available in a system of reasonable size and cost. It combines very wide frequency range, low distoetion and exceptionally uniform response across the audible frequency range. It offers the greatest low frequency and power handling capabilities of all KLH bookshelf size speaker systems. And its high frequncy response and dispersion provide the impression of an open, completely unrestricted sound source, with fullmusical definition of even the most complex and demanding orchestral material.

The Model Five is a four-speaker, three-way system of acoustic suspension design, housed in a cabinet of oiled walnut measuring 26 inches by 13-¾ inches by 11-½ inches. It is finished on four sides, and may be used vertically or horizontally on the floor or wall. Its impedance is 8 ohms, allowing efficient power transfer from solid-state amplifiers. And its power demands (suggested minimum; 25 watts IHF music power per channel) are well within the capabilitles of good amplifiers of both tube and transistor design.

 The low frequency speaker is a 12-inch driver with heavy cone and magnet assemblies. Its cone is a critically controlled mixture of cotton and wood pulps, wool and asphalt. Like other KLH acoustic suspension speaker, it does not rely on the stiffness of a conventional outer cone suspension to control the motion of its cone at low frequencies.

Instead, it uses the acoustic stiffness of the air trapped within its tightly sealed cabinet to supply the necessary restoring force for the cone. This "air spring" is far more linear in action than the best mechanical speaker suspensions, and reinforces the cone's ability to make accurate axcursions over long distance to reproduce the lowest frequencies without distortion. Its low frequency harmonic distortion, the most critical factor in determining the usable bass response of a loudspeaker, remains minimal at the lowest frequencies and the highest listening levels ever likely to be called for in a living room. Its overall bass capabilities are greater than those of far lerger conventional speaker systems.

The two mid-range speakers are he same remarkable miniature, heavy magnet drivers used as full range units in the KLH Model Twenty-One radio and model Eleven phonograph. These speakers, with the highest ratio of magnet power to cone weight over built into a loudspeaker, are capable of far wider frequency coverage than they are called on to supply in the Model Five. Their use here over a limited frequency range helps to achieve a trully remarkable clarity and uniformity of response in the mid-range, and to supplement the excellent dispersion of high frequencies.

The high frequency speaker, also mounted in a sub-enclosure, is a 1-¾-inch direct radiator with a cone of critically shaped shell-like amterial. The high frequency response of the Model Five is greatly responsible for both its remarkable musical definition and the impression of an open, unrestircted sound source. High frequencies actually play a more important role than bass in achiving breadth and spaciousness of reproduced sound, and the Model Five's overall performance at high frequencies is equalled. In our experience only by the KLH Model Twelve, which uses the same mid- and high frequency drivers. The Model Five's capability for revealing without exaggeration, previously missing details of musical definition is best judged by listening to a good record with which you are throughly familiar. We believe you will be genuinely startlrd by the results of such a lest.

 The cones suspensions and other critical parts of all four speakers in the Model Five are designed, manufactured, and rigidly controlled by KLH. It also allows attention to the small details of construction that are at least as important as basic design principles in achieving a given and consistend level of performance. And it allows us to guarantee that any two Model Five all the production line will  match within 1-½ dB across the entire frequency range - a level of uniformity which can be promised, to our knowledge, by no other manufacturer.

To provide for a final choice by the listener of the relative balance of important segments of the frequency range, the Model Five is provided with two three-position switches that adjust the 2500 - 7000 cps and 7000 - 20,000 cps ranges. These switches permit far more precise and repeatable adjustments than do the simple variable resistors offered for high frequency adjustment of most multi-speaker systems.

The Model Five is constructed of ¾-inch plywood carefully finished with furniture grade walnut veneer. Its cabinet design is intended to make the system appear smaller and less obtrusive than speakers of equivalent size. The grille panel can be shapped out for cleaning or substitution of other grille materials.

Specifications:

Power Handling:  25 watts minimum

Nominal Impedance:  8 Ω

Dimensions (W x H x D):  13 ¾ x 26 x 11 ½ inches

Weight (unpacked):  44 lb

KLH Model Seven

 The development of the Model Six has served as a valuable source of information for the design and construction of the Model Seven. Believing that a need exists for a loudspeaker system of about this size, the disign staff of KLH began the construction of prototype units using dynamic loudspeakers of various sizes and types. The system which resulted after a number of different units had been made and tested is now in production.

 The low frequency section of the Model Seven is a 12-inch acoustic suspension loudspeaker. The enclosure volume of 2,6 cu. Ft. Permits a very compliant moving system for extended low frequency response.

The high frequency section of the Model Seven consists of two small cone-type direct rediators operating as rigid pistons over a range from 1500 to 20,000 Hz. The use of two such loudspeakers gives a surprisingly large apparent sound source.

The low and high frequency sections are united by an LC crossover network, which establishes the crossover point at 1500 Hz. The relative levels of the low and high frequency section can be varied ±2,5 dB by means of a switch on the back of the enclosure. This provision is made to offer some degree of control over different room acoustics.

Cabinet Size: 24-3/4 x 21-1/2 x 11-7/8 inch (H x W x D)

Volume:  2,6 cu. Ft.

Impedance:  8 ohms

Weight:  52 lbs (shipping)

Finish:  mahogany or oil Walnut

KLH Model Seventeen

"The KLH Seventeen costs $74,95 (1971). But, unfortunately, a lot of people feel they have to spend more to get really great speakers.   So they sink most of their budget into a pair of super-duper loudspeaker.  Then they try to save a few bucks by buying a soso receiver. Figuring they can always trade up later. But what happens is the inexpensive receiver chokes itself trying to drive inefficient, expensive loudspeakers. And that's usually enough to make most people lose interest in their stereo system. So they forget about trading up, down, or sideways and just let all that shiny new equipment collect dust. But we think we can satisfy people looking for high-priced sound. With our Seventeen. One reviewer even wrote "Its sound matches or surpasses most other speakers we have heard which sell for twice the price.' The Seventeen effortlessly produces rich, full-bodied bass response.  In fact only slightly less than our now-famous Model Six. The highs are clean and unfurry and they snap through the room with all the resonance and presence of the live performance itself.  And, most important, the Seventeen will do all this hooked to a relatively low-power receiver.  So, which would you rather have?  A moderately priced stereo system which delivers an extraordinary amount of sound?  Or an expensive pair of bookends?"

The Model Seventeen is an 8 ohms full range, two-way system consisting of 10" acoustic suspension woofer and a 1¾" direct radiator tweeter in a handsome, compact enclosure. Any high quality 12-watt-per-channel amplifier is sufficient to drive it, yet its power handling capability is such that any amplifier intended for home music reproduction may safely be used.  3-position switch permits increase or decrease of 2,5 dB in hi-frequency level for matching system to any acoustic environment.  Its audible smoothness and balance reflect its carefully integrated system.

It is housed in a ¾" furniture-grade vennered cabinet, completely sealed and filled with fibreglass.

Dimensions (W x H x D):  11¾" x 23⅛" x 9"

Weight:  30 lbs (shoping)