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Overview: The Rockford Fosgate Prime Marine M750-1D is a
750-watt mono Class D marine amplifier. It is optimized to power
subwoofers, and is 1-ohm stable. The Class D design is very efficient with a cast aluminum heatsink to keep it in a small footprint.
The amplifier has 78% average efficiency at 4-ohms.
Marine Amplifier: The M750-1D is designed for the harsh
marine environment. The amplifier features a conformal-coated PCB and
UV-resistant finish, and conforms to UV and Salt-Fog protection standards.
CEA-2006 Compliant: CEA-2006 is a system of testing and
measurement methods for mobile audio amplifiers. This voluntary standard
advocates a uniform method for determining an amplifier's RMS power output and
signal-to-noise ratio. The criteria for measuring power uses a DC input voltage
of 14.4 volts and the RMS power output is measured into a 4-ohm load with 1% or
less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is
measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4
ohms. CEA-2006 allows consumers to compare amplifiers and receivers on an equal
basis. The CEA-2006-rated RMS power output is as follows (measured with a 14.4
volt input, <1% THD+N, 20 Hz-250 Hz):
- 4-Ohm: 250 watts x 1
- 2-Ohm: 500 watts x 1
- 1-Ohm: 750 watts x 1
Cast Aluminum Heatsink: The cast aluminum heatsink
dissipates heat generated by the amplifier's circuitry. The inherent advantage
of casting provides a 30% improvement of cooling over conventional extrusion
LED Indicator: The amplifier is equipped with a top-mounted
LED indicator which illuminates blue when the
unit is turned on. The LED illuminates red when a
protection circuit engages (thermal, short circuit, or too low an
impedance is detected at the speaker connections). The
amplifier automatically turns off if this occurs.
Mounting: The amplifier can be mounted vertically, horizontally,
or inverted using the supplied mounting screws; horizontal mounting (right side up)
will provide the best cooling.
Amp Controls: The M750-1D has the following top-mounted controls:
- Gain Control: a rotary gain control that can be
adjusted from 1
- Low Pass Filter: a 12 dB/octave Butterworth low pass
filter with a crossover point variable from 50 Hz to 250 Hz
- Infrasonic Filter: a variable 15-40Hz, 12 dB/octave infrasonic
filter designed to prevent frequencies below the audio range from being
applied to the subwoofer
- Punch EQ: a rotary bass
boost control, centered at 45 Hz, from 0 dB to +18 dB
Remote Punch Level Control: The amplifier includes a wired
Remote Punch Level Control, which is linked to the gain control of the
amplifier. The module allows you to remotely control the output level of the
amplifier from the dash or center console of your vehicle. The Remote Punch
Level Control features a rotary dial, and comes with mounting hardware and a 16.5'
Terminals: The amplifier features heavy duty, nickel-plated
set-screw terminals. The set screws can be tightened or loosened with the
supplied 3mm Allen wrench. The terminals include:
- Power/Ground: will accommodate up to 4-gauge wire
- Remote Turn-On: will accommodate up to 8-gauge wire
- Speaker Terminals: will accommodate up to 8-gauge wire. Two
Positive (+) and Negative (-) terminals are provided for installation
flexibility. Both terminals are wired in parallel internally.
Fuses: The amplifier does not have on-board fuses. A 60A
fuse should be placed on the power wire within 18" of the battery.
RCA Input Jack: The RCA input jacks are nickel-plated to resist signal degradation caused
RCA Pass-Thru Jacks: The nickel-plated RCA pass-thru jack
provides a convenient source for daisy-chaining an additional amplifier without
running an extra set of RCA cables from the front of the vehicle to the