KLH Model Six (1958–1972)
A two-way acoustic suspension loudspeaker system designed by Henry Kloss, produced for 14 years.
Overview
The KLH Model Six is a two-way loudspeaker system developed by KLH, founded in 1957 by Henry Kloss. Designed by Kloss himself, it was produced from 1958 to 1972 and is recognized as one of the company's landmark speakers of that era. The speaker uses an acoustic suspension design and features a newly developed small cone-type tweeter. It was noted for its fidelity, bass performance, and simple crossover construction, and later inspired the naming of the Cambridge SoundWorks Model Six in tribute.
Specifications
| Impedance | 8 ohm |
| Speaker type | two-way |
| Power handling | RMS – 12 W, Max RMS – 150 W |
| Dimensions | H – 24", W – 13", D – 12 5/8" |
| Weight | 42 lbs ea |
Design
The KLH Model Six uses an acoustic suspension enclosure with an inverted surround woofer. The high-frequency section employs a newly developed small cone-type tweeter. The crossover is simple in design, using an oil-filled capacitor and a few resistors. Some units feature an epoxied woofer, and crossovers have been rebuilt in restored examples, which also include new finish and grill cloth.
Context
The KLH Model Six was described as one of the company’s landmark products following its founding in 1957, with production spanning 14 years from 1958 to 1972. It was later honored by Cambridge SoundWorks, which named its own Model Six in recognition of Kloss’s original design.
Market
Used pairs of KLH Model Six speakers have sold between $150 and $325 in recent years, with one pair listed at $300 a decade ago. Replacement grill cloth is available for $74.99. Common issues include failed tweeters, and some early models have epoxied woofers that may require servicing.
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