Harman HK-40 (ca. 1966)
Little is documented about the Harman HK-40 on its own, because it didn't really exist on its own. Period reviews describe it as the speaker system supplied with the Harman-Kardon SC-440 modular system. HiFI-Stereo (September 1966, p.48) called the HK-40 "perhaps its most outstanding feature," and measured a very smooth overall response: within ±2 dB from 850 to 15,000 Hz, and ±3 dB over a wider range. Each enclosure used a 10-inch acoustic-suspension woofer. Tone-burst tests showed excellent 1.6-kHz and 300-Hz output, with slight ringing at 800 Hz.
The cabinets measured 13½ × 10½ inches and weighed about 30 pounds each. They suited floor or shelf mounting, and felt pads were supplied to protect the finish. High Fidelity (July 1966, p.59) covered the SC-440 modular system as a whole. The HK-40's standalone availability, original price, and production years are not recorded in the period sources we have.
Known specs from period coverage:
- 10-inch acoustic-suspension woofer per enclosure
- Frequency response: ±2 dB from 850 to 15,000 Hz; ±3 dB over a wider range
- Cabinet: 13½ × 10½ inches, ~30 lbs each
- Floor or shelf mounting with supplied felt pads
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