JL Audio MHD750/1: marine monoblock amplifier, 750 W
The MHD750/1 is the marine monoblock amplifier, 750 W in the JL Audio MHD series: very compact amplifiers with plenty of power and carefully designed signal processing. It delivers 750 W RMS on one channel, at both 4 and 2 ohms.
It is the wide-range model meant for subwoofers, with filter, output polarity switch and the option of adding a remote level control.
Key features
- Monoblock: 750 W RMS x 1 at 4 and 2 ohms
- Frequency response 6 Hz-8 kHz
- Operating voltage 11-14.5 V
- Weight 2.99 kg; indicated fuse 60 A
- Class D amplifier with Single Cycle Control plus the R.I.P.S. supply
- Filters switchable between 12 and 24 dB per octave
- Switchable RCA inputs: 200 mV-2 V or 800 mV-8 V RMS
- Footprint 273 x 199 x 49 mm
Single Cycle Control plus R.I.P.S.
The Single Cycle Control circuit corrects the output more than 400 thousand times a second: sound benefits while current draw and heat go down. The regulated R.I.P.S. supply keeps full power into loads between 1.5 and 4 ohms per channel, whatever the supply voltage within the intended range.
Filters and inputs
The filter can be defeated or used as low-pass or high-pass, with frequency adjustable from 50 to 500 Hz. Slopes are 12 dB per octave Butterworth or 24 dB per octave Linkwitz-Riley, with calibrated potentiometers to blend subwoofers and component systems precisely. The differential-balanced inputs also accept the high-level signal from speaker outputs, with no converter, and reject noise. Alternator whine stays out.
Protection and cooling
If temperature climbs too high, the protection circuit lowers power instead of shutting the amplifier down: music carries on even in the toughest conditions. The chassis sheds heat with no fans and, with the optional kit, lets one amplifier sit on top of another without losing cooling capacity.
Build and installation
The chassis is all aluminium, powder coated, with hardware chosen not to corrode, and a waterproof safety door shields the controls. Every MHD model has the same footprint, which simplifies laying out several units. Power and speaker connectors unplug, a help in tight spaces. It runs on 11 to 14.5 V and weighs 2.99 kg; the indicated fuse is 60 A, AFS, AGU or MaxiFuse type. The power and ground cable indicated is 4 AWG copper at least.
What's in the box
- The amplifier
- Plug-in power connector
- Plug-in speaker connectors
- Four fixing feet
- 2.5 mm and 4 mm hex keys
- Four set screws
- JL Audio badge
