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Power Ratings: The Sound Ordnance M-4075 is a 4-channel
Class AB amplifier with an RMS power rating of 75 watts per channel into 4
ohms, and 120 watts per channel into 2 ohms. The amp can also be bridged into a 4-ohm load for a power rating of 240 watts (x 2). Power ratings are measured with an
input power of 14.4 volts.
Crossovers: The M-4075 is equipped with both high-pass and
low-pass crossovers. The front channels (channels 1 and 2) and the rear channels
(channels 3 and 4) have separate crossovers. You can set the low-pass cutoff
frequency between 50Hz and 250Hz, and the high-pass cutoff frequency between
80Hz and 2 kHz. Separate switches let you select low-pass, high-pass, or
full range operation for the rear channels, and high-pass or full range for the
front channels. The crossovers have a 12dB per octave slope.
Bass Boost: The amplifier has a bass boost switch, labeled
Super Bass, to give small subwoofers more volume in the low frequencies. You can
select the amount of boost with the 3-way switch: 0dB, 6dB, or 12dB. The Super
Bass feature is available for the rear channels only.
LED Indicators: The M-4075 features two LED indicators: a green LED
that illuminates when the amp is powered on, and a red LED that illuminates when
the amplifier is in protect mode due to overheating or a short circuit in the
Removable End Caps: The end caps on the M-4075 are removable
with a 3mm Allen wrench (not supplied) to make it easier to attach the power and
Power Connections: The power
and ground connections are set screw terminals that will accommodate up
to 8-gauge wire. (An 8-gauge amplifier wiring kit is recommended.) The remote turn-on terminal is a set screw terminal that will
also accept up
to 8-gauge wire. A Phillips-head screwdriver (not supplied) is required to tighten/loosen
Speaker Connections: The
speaker connections are set screw terminals that will accommodate up to 8-gauge wire.
A Phillips-head screwdriver (not supplied) is required to tighten/loosen the terminals.
RCA Inputs and Outputs: The amplifier features two pairs of stereo RCA
inputs for connecting your head unit--one pair for the front channels and one
pair for the rear channels. If your head unit only has one pair of preamp
outputs, you can feed all four amplifier channels by connecting optional
Y-adapters. (You will lose front-to-back fader capability if you connect the
amplifier using Y-adapters.) There is also a pair of stereo RCA outputs for
feeding the preamp signal to another amplifier, if needed.
Fuses: The M-4075 features two 30-amp ATC blade fuses.