SFB-200.4 V2

The SFB-200.4 V2 is a four-channel full-range amplifier that stays stable down to 1 ohm on every channel. Output is 200W x 4 at 1 ohm, 125W x 4 at 2 ohms, and 75W x 4 at 4 ohms, for 800W total.

That 1-ohm rating per channel is the feature that matters. Most four-channel amps stop at 2 ohms, which limits how many speakers you can parallel. With the SFB you can wire several speakers on each channel, which is how P.A. mid and high arrays, large marine systems with multiple zones, and multi-pair car builds get powered from one compact chassis.

SFB stands for Sundown Full Bridge, the Brazilian-style design built around raw power per cubic inch. Filtering covers a variable 12dB low pass from 50 Hz to 6 kHz and a variable 12dB high pass from 15 Hz to 6 kHz, plus variable 12dB bass boost at 50 Hz, so the same amp can run component sets, midbass, or bridged bass duty.

Frequency response is 10 Hz to 20 kHz at -3 dB, input impedance is 56k ohms, input sensitivity is 5V max, and signal to noise ratio is 100 dB. Protection circuitry covers thermal, voltage, speaker short, and DC-offset conditions, with power, protection, and clipping indicators on board. An optional wired remote with clipping indicator is available.

Working voltage is 10.5V to 15.5V with an 80A recommended fuse.