Kenwood KAC-D3104 4-Channel Class D Power Amplifier

The Kenwood KAC-D3104 is a compact four-channel Class D car audio power amplifier designed to add dedicated amplification to a vehicle sound system. It provides 50 watts RMS to each of four channels at 4 ohms, making it suited to powering upgraded front and rear speakers. Its compact chassis helps address installations where space behind panels, beneath seats, or in a trunk is limited.

This amplifier is a practical choice for listeners who want clearer, more controlled output than a typical factory head unit can provide. It supports both RCA line-level input and speaker-level input, allowing it to work with a variety of aftermarket or factory-source systems. Signal-sensing turn-on support can simplify integration when using a speaker-level source.

The KAC-D3104 uses Class D amplification and a Power MOS-FET switching power supply in a compact format. Its frequency response extends from 20 Hz to 50 kHz, supporting full-range speaker systems and high-resolution audio playback. Kenwood's Dual Sigma Drive negative-feedback circuit is designed to improve damping and signal accuracy.

Each A/B channel pair has selectable variable high-pass or low-pass filtering from 50 Hz to 200 Hz. This flexibility lets the amplifier run full-range speakers with high-pass filtering or support a filtered speaker/subwoofer configuration when the system design calls for it. Bass boost is available on the B-channel section at 40 Hz, adjustable from 0 dB to +18 dB.

For larger system plans, the KAC-D3104 can also be bridged to deliver 150 watts RMS to each of two 4-ohm channels. That makes it adaptable for a two-channel higher-power speaker setup, while its standard four-channel mode is appropriate for front-and-rear speaker upgrades. Proper impedance matching, power wiring, grounding, and gain setup remain important for reliable operation.

Key Features

• Four-Channel Class D Design: Powers four speakers from a compact amplifier chassis.
• 50W RMS x 4 at 4 Ohms: Delivers dedicated power for full-range speaker upgrades.
• 2-Ohm Load Capability: Produces 75W RMS per channel at 2 ohms.
• Bridgeable Channels: Configures as two 150W RMS channels at 4 ohms.
• Variable HPF and LPF: Helps match output to speaker system needs.
• Speaker-Level Input: Supports integration with systems lacking RCA outputs.

Design & Installation

The KAC-D3104 uses an extruded aluminum heat-sink design and a compact 6-11/16 by 2-3/16 by 7-3/8 inch chassis. Its terminal layout includes M6 screw-type battery and ground terminals plus M4 screw-type speaker output terminals. The design combines four channels of Class D amplification with separate A- and B-channel filter and sensitivity controls.

Install the amplifier in a dry, ventilated location with secure mounting and appropriate power, ground, remote-turn-on, signal, and speaker wiring. Use four-channel mode for separate front and rear speakers, or bridge paired channels only with a 4- to 8-ohm bridged load. Set input sensitivity and crossover controls after matching the amplifier to the source unit and connected speakers.