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Table of Contents
- 1 Protect Your Hearing
- 2 Installation Applications
- 3 Typical Installation Sequence
- 4 Power Connections
- 5 Fuse Requirements
- 6 Turn-On Options
- 7 Input Section
- 8 Input Voltage Range
- 9 Input Sensitivity Controls
- 10 Filter Controls
- 11 Speaker Outputs
- 12 Bridging Considerations
- 13 System Configurations
- 14 Multi-Amplifier Systems
- 15 Servicing Your Amplifier
- 16 Appendix C: Troubleshooting
- Download this manual
OWNER'S MANUAL
400W 4-Channel Class D 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 contact the JL Audio Technical Support Department
at technical@jlaudio.com/support.
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Table of Contents
Related Manuals for JL Audio JD 400/4
Summary of Contents for JL Audio JD 400/4
- 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
INPUT SECTION PREOUTS CH. 1&2 CH. 3&4 CH. 1&2 (only) Filter Mode Input Sensitivty Filter Mode Input Sensitivty (pg. 8-9) Control (pg. 8-9) Control (pg. 8) (pg. 8) Filter Filter Frequency Frequency Control Control (pg. 8-9) (pg. 8-9) JL Audio... -
Page 3: Installation Applications
This is an extremely dangerous Cooling Efficiency Considerations: practice which can result in severe damage to The outer shell of your JL Audio amplifier your vehicle and person. is designed to remove heat from the amplifier • Protect all system wires from sharp metal edges circuitry. -
Page 4: Typical Installation Sequence
If the fused main power wire is shared aftermarket source unit or OEM Interface with other amplifiers or devices, fuse each processor (like the JL Audio FiX™ 82 or FiX™ 86). amplifier/device within 12 inches (30 cm) of Additional steps and different procedures may wire length, via a fused distribution block or be required in some applications. -
Page 5: Fuse Requirements
30 cm of wire length). The fused output of the distribution block will connect to the amplifier I M P O R TA N T ! with 4 AWG copper power wire. JL Audio ECS Many vehicles employ small (10 AWG - fused distribution blocks are recommended (XD-FDBU–2 and XD-FDBU–4). -
Page 6: Turn-On Options
The circuit is tuned to react to signals at mid- range frequencies. This prevents false switching from signals created by moving loudspeakers that are in parallel with the amplifier’s input signal. The circuit senses the input signal from the CH. 1 (L) channel input only. JL Audio... -
Page 7: Input Section
RCA cables or plugs or use the JL Audio ECS Speaker If you wish to send four discrete channels into Wire to RCA adaptor (XD-CLRAIC2-SW). -
Page 8: Input Sensitivity Controls
Appendix A (page 14). INPUT SECTION Doing so will result in audible distortion and CH. 1&2 CH. 3&4 possible speaker damage. JL Audio... - Page 9 PREOUTS 1) “Filter Mode” Controls: The JD400/4 The JD400/4 includes a buffered, pass-through preamp output section, so that additional employs 12 dB per octave filters for each pair of channels. Each of these filters can be amplifiers can be easily added to the system. The controlled or defeated completely by way of the preamp output delivers the same signal that is three-position “Filter Mode”...
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Page 10: Speaker Outputs
1) Left Channel Only or Right Channel Only Information: If you wish to send a left-only or right-only signal to a pair of the JD400/4’s channels, use a “Y-Adaptor” to split the single channel signal into both left (CH. 1&3) and JL Audio... - Page 11 2) Flashing/Constant Red: The Protection right (CH. 2&4) RCA inputs. This option is useful when using a pair of the JD400/4’s LED also illuminates during over-current channels to drive left channel speakers only conditions. This may result in the LED and the other pair of the JD400/4’s channels to flashing as it corresponds to peaks in 242 mm...
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Page 12: System Configurations
Appendix A (page 14), you can fine Inp ut Connections: the first stereo pair of source tune filter frequencies and attenuate either unit outputs is connected to the “CH 1 (Left)” pair of channels to achieve proper balance. JL Audio... -
Page 13: Multi-Amplifier Systems
JL Audio dealer so user adjustable from the front of the vehicle. that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. - Page 14 Sens.” if any equalizer boost is activated after overlap with moderate clipping at full volume. setting the amplifier's input sensitivity with this procedure. This applies to any EQ boost circuit, including source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment. JL Audio...
- Page 15 APPENDIX B: JD400/4 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 Bridged, all channels driven: 150W RMS x 2 @ 8 ohms, 200W RMS x 2 @ 4 ohms Rated Power @ 12.5V with less than...
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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. JL Audio... - 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 amplifier 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.
- Page 18 INSTALLATION NOTES: Use this diagram to document your amplifier’s switch and control positions. INPUT SECTIO CH. 1&2 JL Audio...
- Page 19 PREOUTS 3&4 CH. 1&2 (only) JD400/4...
- 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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