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owner's manual
Monoblock Wide-Range Marine Amplifier
Thank you for purchasing a JL Audio amplifier for
your marine sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vessel.
For maximum performance, we highly recommend that you have
your new amplifier installed by an authorized JL Audio dealer. Your
authorized dealer has the training, expertise and installation equipment
to ensure optimum performance from this product. Should you
decide to install the amplifier yourself, please take the time
to read this manual thoroughly so as to familiarize yourself
with its installation requirements and setup procedures.
If you have any questions regarding the instructions in this
manual or any aspect of your amplifier's operation, please contact your
authorized JL Audio dealer for assistance. If you need further assistance,
please call the JL Audio Technical Support Department
at (954) 443-1100 during business hours.
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Summary of Contents for JL Audio MHD750/1
- Page 1 For maximum performance, we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer. Your authorized dealer has the training, expertise and installation equipment to ensure optimum performance from this product.
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Page 2: Protect Your Hearing
Left & Right Preamp Remote Level Connector Connector Output Jacks Control Knob (pgs. 6-7) (pgs. 6-7) (pg. 12) (pg. 13) +12 VDC Ground +12 VDC Ground Remote Remote Inputs Preouts Remote Level Control 2 | JL Audio - MHD750/1 Owner’s Manual... -
Page 3: Safety Considerations
The outer shell of your JL Audio amplifier Your amplifier needs to be installed in a dry, is designed to remove heat from the amplifier well-ventilated environment and in a manner circuitry. For optimum cooling performance, which does not interfere with your vessel’s factory... -
Page 4: Product Description
Unlike most monoblock amplifiers, the MHD750/1 is a wide-range design, so it can be used as a subwoofer amplifier or as a very powerful mid-bass or mid-range amplifier, using a second HD750/1 to form a stereo pair. -
Page 5: Typical Installation Sequence
14) Make necessary adjustments to the input distribution block when additional amplifiers are being installed with the MHD750/1 and sensitivity controls to obtain the right powered from the same main power wire. overall output and the desired balance 3) Connect power wire to the positive battery in the system. -
Page 6: Battery Connection
If only the MHD750/1 is being run from terminal connector, such as the JL Audio that power wire, we recommend a 60A fuse XB-BTU. -
Page 7: Ground Connection
(pull The MHD750/1 uses a conventional +12V back firmly) and back out the set screws on remote turn-on wire, typically controlled by the connector plug, using the supplied 4 mm hex wrench for the “+12 VDC”... -
Page 8: Standard Mounting
Lateral Mounting Feet. Check before drilling any holes in your vessel to make sure that you will not be drilling through a gas tank, brake line, wiring harness or other vital vessel system. 8 | JL Audio - MHD750/1 Owner’s Manual... -
Page 9: Input Controls
OEM (factory-installed) systems. To use speaker-level sources, splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs for each input pair or use the JL Audio ECS Speaker Wire to RCA adaptor (XB-CLRAIC2-SW). -
Page 10: Crossover Controls
While this may sound counter- critical to sound quality and reliability. intuitive, it is correct as described. The MHD750/1 has one filter, which can be configured as a high-pass filter (attenuates low “input sens.” control frequencies) or as a low-pass filter (attenuates Located to the left of the “Input Voltage”... -
Page 11: Infrasonic Filter
inFrasonic Filter 2) “Filter Slope” Control: This switch allows you The “Infrasonic Filter” is a 24 dB/octave high- to select from two filter slopes: pass filter, with a fixed cutoff frequency of 30 Hz. This filter is designed to conserve amplifier power “12dB”: Configures the filter to attenuate and protect subwoofer systems, without audibly frequencies above or below the selected... -
Page 12: Preamp Outputs
750/1 allows you to quickly peform this polarity any crossover filter or input sensitivity setting inversion without touching any wires. Simply selected on the MHD750/1 (if the input signal flip the switch from the “0” (normal) to the “180 is full-range, the Preamp Output will be full- deg.”... -
Page 13: Speaker Connections
The MHD750/1 employs JL Audio’s exclusive Control (HD-RLC), you can control the volume of Regulated, Intelligent Power Supply (R.I.P.S.) the MHD750/1 from the front of the vessel. This design. This sophisticated power supply allows is particularly useful for subwoofer level control. - Page 14 Do not chassis ground any speakers connected (except for the “Status” LED) will shut itself to this or any other JL Audio amplifier. Doing off to protect itself and the vessel’s charging so will cause the amplifier to go into protection system.
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Page 15: Preamp Output
Filter Type: State-variable, 12 dB/octave Butterworth or return it to your authorized JL Audio dealer so 24 dB/octave Linkwitz-Riley that it may be sent in to JL Audio for service. Filter Modes: Low-Pass or High-Pass, Defeatable. There are no user serviceable parts or fuses inside Cutoff Freq. -
Page 16: Necessary Equipment
Sens.” for the affected channels if any equalizer boost is activated after setting the “Input Sens.” with this procedure. This applies to any EQ boost circuit, source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment. 16 | JL Audio - MHD750/1 Owner’s Manual... - Page 17 The “Input Sens.” controls can to 3/4 of maximum output. This will allow for reasonable gain overlap with moderate clipping now be adjusted downward if the MHD750/1 at full volume. requires attenuation to achieve the desired 5) Using the chart below, determine the system balance.
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Page 18: Appendix D: Troubleshooting
Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier. 18 | JL Audio - MHD750/1 Owner’s Manual... - Page 19 “my amplifier shuts off once in a while, usually at higher volumes” Check your voltage source and grounding point. The power supply of the MHD750/1 will operate with charging system voltages down to 8.5V. Shutdown problems at higher volume levels can occur when the charging system voltage drops below 8.5V.
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Page 20: Installation Notes
20 | JL Audio - MHD750/1 Owner’s Manual... - Page 22 22 | JL Audio - MHD750/1 Owner’s Manual...
- Page 23 notes...
- Page 24 - marine Products (usa) JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of two (2) years from the original date of purchase. This warranty is not transferable and applies only to the original purchaser from an authorized JL AUDIO dealer.
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