Kenwood KAC-721

A stereo power amplifier designed for car audio systems

Overview

The Kenwood KAC-721 is a 2-channel stereo power amplifier marketed for car audio use. Described as a "retro amplifier" and "vintage old school audio," it delivers rated output power of 37 watts per channel into an unspecified load with less than 0.5% total harmonic distortion. At maximum output, it produces 70 watts per channel at 1 kHz into 4 ohms. It features color-coded speaker wiring and standard automotive power connections, with red for +12V, black for ground, and blue for remote turn-on. This unit has appeared in listings across North America and Europe, often noted for its compact size and suitability 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, with prices ranging from $20 to €139. One listing noted 14 watchers and accepted Best Offer at a price of C $123.64. A service manual is available separately for $12.50, and replacement harnesses suggest parts availability. It is described as a great small power amplifier for mid-range or tweeter use in active systems.