Kenwood KAC-721
A stereo power amplifier designed for car audio systems
Overview
The Kenwood KAC-721 is a 2-channel stereo power amplifier sold for car audio. Listings call it a "retro amplifier" and "vintage old school audio." Rated output is 37 watts per channel into an unspecified load, with less than 0.5% total harmonic distortion. At maximum output it makes 70 watts per channel at 1 kHz into 4 ohms. The speaker wiring is color-coded, and the power connections are the standard automotive ones: red for +12V, black for ground, blue for remote turn-on. Units have turned up in listings across North America and Europe. Sellers often mention the compact size and its fit for driving mid-range speakers or tweeters in active systems.
Specifications
| Product type | Stereo Power Amplifier Car Amp |
| Max Power Output | 70W + 70W (1 kHz, 4 Ω) |
| Rated Output Power | 37W + 37W (less than 0.5% THD) |
| Wire identification | red: +12V, black: ground, blue: remote turn-on, speaker wires color-coded |
Market
Pre-owned units have been listed in the United States, Germany, and the UK, at prices from $20 to €139. One listing had 14 watchers and accepted Best Offer at C $123.64. A service manual is available separately for $12.50, and replacement harnesses suggest parts are available. One description calls it a great small power amplifier for mid-range or tweeter use in active systems.
eBay Listings
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