JL Audio HD750/1 Owner's Manual
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JL Audio HD750/1 Owner's Manual

Monoblock full-range amplifier
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owner's manual
Monoblock Full-Range Amplifier
Thank you for purchasing a JL Audio amplifier for
your automotive sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vehicle.
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 HD750/1

  • 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.

  • 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 - HD750/1 Owner’s Manual...
  • Page 3 Your JL Audio amplifier employs an Your amplifier needs to be installed in a dry, advanced type of heat management, called well-ventilated environment and in a manner RealSink™. This feature takes advantage of which does not interfere with your vehicle’s safety...

  • Page 4: Product Description

    Product descriPtion The JL Audio HD750/1 is a very powerful and compact monoblock (single channel), full-range amplifier utilizing patented Single Cycle Control™ Class D technology. This groundbreaking technology delivers reference- grade sonic performance while requiring far less current from the vehicle’s electrical system than a conventional amplifier.

  • Page 5: Typical Installation Sequence

    Then insert any questions, please contact your authorized the power connector plug into the amplifier’s JL Audio dealer for assistance. power connector receptacle, pushing firmly. 1) Disconnect the negative battery post 9) Connect the RCA input cables connection and secure the disconnected cable to the amplifier.

  • Page 6: Battery Connection

    “CCA” wire because the vehicle and your body during installation. this wire is significantly less conductive than pure copper wire. Only use pure copper power wire, such as JL Audio’s Premium Power Wire. +12 VDC Ground +12 VDC Ground Remote...

  • Page 7: Ground Connection

    When using smaller wire, it may optimal grounding, we recommend the be necessary to strip 1 inch of insulation from use of a JL Audio ECS master ground lug the wire and fold the bare wire in half prior to (XB-MGLU). Alternatively, a sheet metal insertion.

  • Page 8: Standard Mounting

    (not included), secure the amplifier by its four Lateral Mounting Feet. Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank, brake line, wiring harness 8 | JL Audio - HD750/1 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 (XD-CLRAIC2-SW).

  • Page 10: Crossover Controls

    Appendix C (pages 18, 19). Doing so will result in Useful for connection of subwoofer(s) audible distortion and possible speaker damage. in a bi-amplified system. 10 | JL Audio - HD750/1 Owner’s Manual...

  • 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

    If you change crossover slopes or crossover filter frequencies, you may need to revisit this control as these can affect the phase of the speaker systems in the overlap region. 12 | JL Audio - HD750/1 Owner’s Manual...

  • Page 13: Speaker Connections

    The RBC-1 Remote Bass Control used with JL Audio Slash, Slash v2, e-Series, A-Series and If you connect a load higher than 4Ω nominal, G-Series amplifiers is NOT compatible with the power will drop by half with every doubling of HD Series amplifiers.
  • Page 14 Do not chassis ground any speakers connected to this or any other JL Audio amplifier. Doing so will cause the amplifier to go into protection and mute the output.
  • Page 15 JL Audio dealer so that may require service of the amplifier, its that it may be sent in to JL Audio for service. wiring or the vehicle’s charging system. Audio There are no user serviceable parts or fuses inside is muted when this fault occurs.
  • Page 16 16 | JL Audio - HD750/1 Owner’s Manual...

  • Page 17: Preamp Output

    aPPendix a: Hd750/1 specifications Amplifier Topology: Class D, switching type with patented Single-Cycle Control™ technology. Power Supply: Pulse width modulation-regulated switching power supply Recommended Fuse Value / Type: 60A (AGU or MaxiFuse™) Rated Power: 750W RMS x 1 @ 1.5-4Ω (11V - 14.5V) THD at Rated Power: <0.03% @ 4Ω...

  • Page 18: 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. 18 | JL Audio - HD750/1 Owner’s Manual...
  • Page 19 the nine-step Procedure 1) Disconnect the Speaker Connector Plug. 6) Verify that you have disconnected the Speaker 2) Turn off all processing on the source unit Connector Plug before proceeding. Play a (bass/treble, loudness, EQ, etc.). Set fader track with an appropriate sine wave (within control to center position and subwoofer the frequency range to be amplified by each level control to 3/4 of maximum (if...

  • Page 20: Appendix D: Troubleshooting

    Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier. 20 | JL Audio - HD750/1 Owner’s Manual...
  • Page 21 “my amplifier shuts off once in a while, usually at higher volumes” Check your voltage source and grounding point. The power supply of the HD750/1 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.
  • Page 22 22 | JL Audio - HD750/1 Owner’s Manual...
  • Page 24 - amPliFiers (usa) JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of two (2) years. The warranty is extended to three (3) years total if installation is performed by an authorized JL Audio dealer using a JL Audio Premium Power Connection System for power wiring.

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