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Table of Contents
- 1 Protect Your Hearing
- 2 Installation Applications
- 3 What's Included
- 4 Planning Your Installation
- 5 Product Description
- 6 Typical Installation Sequence
- 7 Power Connections
- 8 Fuse Requirements
- 9 Input Section
- 10 Input Type
- 11 Input Voltage Range
- 12 Speaker Outputs
- 13 System Configurations
- 14 Appendix C: Troubleshooting
- 15 Installation Notes
- Download this manual
OWNER'S MANUAL
400W 4-Channel 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 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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Table of Contents
Related Manuals for JL Audio RD400/4
Summary of Contents for JL Audio RD400/4
- 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 CHANNELS 1 & 2 CHANNELS 3 & 4 CH. 1 CH. 3 Mono Right CH. 2 CH. 4 Only CH. 1 CH. 2 CH. 3 CH. 4 +12 VDC Ground Remote 2 | JL Audio - RD400/4 Owner’s Manual... -
Page 3: Planning Your Installation
You should also take the time to Cooling Efficiency Considerations: securely mount the amplifier so that it does not The outer shell of your JL Audio amplifier come loose in the event of a collision or a sudden is designed to remove heat from the amplifier jolt to the vehicle. -
Page 4: Product Description
PRODUCT DESCRIPTION The JL Audio RD400/4 is a four-channel, full- ground lug, XB-MGLU is recommended). Use range audio amplifier utilizing JL Audio NexD™ 4 AWG copper wire, no longer than 36 inches ultra-high speed switching technology to deliver (90 cm) from the amplifier to the ground outstanding fidelity and efficiency. -
Page 5: Power Connections
For optimal grounding, we recommend the use of a JL Audio ECS master ground lug CH. 1&2 CH. 3&4 Speaker Outputs Speaker Outpu (XB-MGLU). - Page 6 TURN-ON OPTIONS The RD400/4 can be switched on and off using These methods are useful when a conventional one of three methods, determined by the position +12V remote turn-on signal is not available in a of the amplifier’s “Turn-On Mode” switch. Please system.
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Page 7: Input Section
CH. 1 CH. 2 CH. 3 CH. 4 +12 VDC Ground Remote Right or use the JL Audio ECS Speaker Wire to RCA Only Bridged Bridged adaptor (XD-CLRAIC2-SW). Line output converters are usually not needed Turn On Mode Input Type with the RD400/4. - Page 8 (louder for a given input voltage). Rotating the The active filter built into each channel control counter-clockwise will result in lower section of the RD400/4 can be used to eliminate sensitivity (quieter for a given input voltage). potentially harmful and/or undesired frequencies...
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Page 9: Speaker Outputs
Tuning Hint: If you are using the RD400/4 the “Input Level” switch is in the “High” to drive a subwoofer system (“LP” mode), a position, the level of the input signal is attenuated component satellite speaker system (“HP” mode) –12 dB to produce a line level signal at the or both, 80 Hz is a good baseline “Filter Freq. - Page 10 Information: If you wish to send a left-only to blue and the amplifier will return to normal or right-only signal to a pair of the RD400/4’s operating mode. channels, set the “Input Type” switch for your bridged channel pair to the “Mono”...
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Page 11: System Configurations
Because the muting with a single RD400/4 are explained in detail. behavior may be very short in duration, it Once you have selected your desired... - Page 12 Freq.” (again, 80 Hz is a good starting point). unit outputs is connected to the “CH 1 (Left)” After proper adjustment of the “Input and “CH 2 (Right)” inputs of the RD400/4. Sensitivity” controls for both channel pairs using The second stereo pair of source unit outputs the method shown in Appendix A (page 14), you is connected to the “CH 3 (Left)”...
- Page 13 JL Audio dealer so B) Subwoofer Level Control Only: that it may be sent in to JL Audio for service. Req uired: a source unit or processor with left, There are no user serviceable parts or fuses inside right and dedicated subwoofer outputs.
- Page 14 “Clipping” LED is solidly lit with the “Input Sensitivity” control turned all the way down, set the “Input Voltage” switch to the “High” position, then slowly increase the “Input Sensitivity” control until the “Clipping” LED is solidly lit. 14 | JL Audio - RD400/4 Owner’s Manual...
- Page 15 APPENDIX B: RD400/4 Specifications Amplifier Section: Amplifier Topology: NexD™ Ultra-High Speed Class D Power Supply: Unregulated MOSFET switching type Rated Power at 14.4V with less than 1% THD+Noise (20 Hz - 20 kHz) RMS Method Stereo, all channels driven: 75W RMS x 4 @ 4 ohms, 100W RMS x 4 @ 2 ohms...
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Page 16: Appendix C: Troubleshooting
Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier. 16 | JL Audio - RD400/4 Owner’s Manual... - Page 17 “My amplifier shuts off once in a while, usually at higher volumes.” Check your voltage source and grounding point. The power supply of the RD400/4 will operate with charging system voltages down to 10V. Shutdown problems at higher volume levels can occur when the charging system voltage (or remote turn-on voltage) drops below 10V.
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Page 18: Installation Notes
Use this diagram to document your amplifier’s switch and control positions. Turn On Mode 4 Channel Amplifier Left ( L ) CH. 1 CH. 3 Mono Right ( R ) CH. 2 CH. 4 Only +12 VDC Ground Remote 18 | JL Audio - RD400/4 Owner’s Manual... - Page 19 Input Type Input Sensitivity Input Type Input Sensitivity Stereo | Mono Stereo | Mono Filter Mode Filter Mode O | HP | LP O | HP | LP Filter Freq. (Hz) Filter Freq. (Hz) CHANNELS 1 & 2 CHANNELS 3 & 4 CH.
- Page 20 All warranty returns should be sent to JL AUDIO ’s Amplifier Service Facility freight-prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original sales receipt). Direct returns from consumers or non-authorized dealers will be refused unless specifically authorized by JL AUDIO with a valid return authorization number.
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