SFB-600D

The SFB-600D is a full-bridge mono amplifier that puts out 600W RMS at 1 ohm from a chassis measuring 7.25" x 5.00" x 2.50". It runs full-range, so the same terminals can power a subwoofer or an array of P.A. speakers. Output tracks impedance: 600W RMS at 1 ohm, 350W RMS at 2 ohms, and 250W RMS at 4 ohms, which covers single-sub bass builds and multi-speaker installs on one amplifier.

Tuning happens onboard. The variable 12dB low pass filter sweeps 80Hz to 20kHz for subwoofer duty, and the variable 12dB high pass filter spans 15Hz to 1kHz when the amp is running midbass or P.A. speakers. A 12dB bass boost centered at 50Hz adds 0-9dB of low-end lift. Input sensitivity tops out at 5V, so it accepts signal from factory head units and aftermarket processors alike.

A dual MOS-FET PWM power supply holds output steady across a 10.5V to 15.5V working range, and an 86dB signal-to-noise ratio keeps the noise floor down. Protection circuitry covers thermal overload, voltage swings, speaker shorts, and DC offset, while power, protection, and clipping indicators report status at a glance. Recommended fuse rating is 60A.

The small footprint is the practical part: it mounts behind a seat, under a console, or on a crowded amp rack where a full-size chassis will not fit, which makes it a straightforward pick for a truck bass build, a work van P.A. rig, or a first subwoofer system.