JL Audio RD400/4 Owner'S Manual Download Page 1

Page: 1 / 20

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.

OWNER’S MANUAL

400W 4-Channel Amplifier

Summary of Contents for RD400/4

Page 1: ...stallation 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 wit...

Page 2: ...h 12 volt negative ground electrical systems Use of this product in vehicles with positive ground and or voltages other than 12V may result in damage to the product and will void the warranty This pro...

Page 3: ...not interfere with your vehicle s safety equipment air bags seat belt systems ABS brake systems etc You should also take the time to securely mount the amplifier so that it does not come loose in the...

Page 4: ...unding point close to the amplifier and connect the negative power wire to it using appropriate hardware use of the JL Audio ECS master ground lug XB MGLU is recommended Use 4 AWG copper wire no longe...

Page 5: ...tighten the set screw firmly taking care not to strip the head of the screw The ground connection should be made using 4 AWG copper wire and should be kept as short as possible while accessing a solid...

Page 6: ...der one of the following alternative turn on options These methods are useful when a conventional 12V remote turn on signal is not available in a system These allow you to operate the amplifier withou...

Page 7: ...200mV and 2V This means that the Input Sensitivity rotary controls will operate within that voltage window If you are using an aftermarket source unit with conventional preamp level outputs this is th...

Page 8: ...uts and the speakers which are acceptable and commonly used for filtering between mid range speakers and tweeters Filtering between subwoofer systems and satellite speaker systems is best done with ac...

Page 9: ...same signal that is connected to the RD400 4 s inputs The preamp output signal is not affected by the amplifier s filter controls If the input signal is full range the preamp output will be full range...

Page 10: ...ition Doing so will internally connect a mono signal to both left and right inputs of the bridged channel pair This option is used when deploying a pair of the RD400 4 s channels to drive left channel...

Page 11: ...are explained in detail Once you have selected your desired configuration you can use the amplifier panel drawing on pages 18 19 to mark the required switch positions for easy reference BI AMPLIFIED...

Page 12: ...and select HP high pass on the Filter Mode switch and an appropriate Filter Freq again 80 Hz is a good starting point After proper adjustment of the Input Sensitivity controls for both channel pairs...

Page 13: ...ut Inp ut Connections one stereo pair of source unit outputs is connected to the CH 1 Left and CH 2 Right inputs of the RD400 4 The second stereo pair of source unit outputs is connected to the CH 3 L...

Page 14: ...sonable gain overlap with moderate clipping at full volume 5 Verify that you have disconnected the speakers before proceeding Play a track with an appropriate sine wave within the frequency range to b...

Page 15: ...d 20 Hz 20 kHz noise bandwidth 84 dB referred to 1W A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 12 Hz 22 kHz 0 1 dB Damping Factor 150 4 ohms per ch 50 Hz 75 2 ohms per ch 50 Hz Input S...

Page 16: ...y is required To test for this problem jump the 12VDC wire to the Remote terminal to see if the amplifier turns on I get a repetitive ticking or popping sound coming out of the speaker s Check the spe...

Page 17: ...while an appropriate test tone is played through the source unit disconnect the input cables from the amplifier prior to this test The frequency used should be in the range that is to be amplified by...

Page 18: ...am to document your amplifier s switch and control positions Left or Mono Right Only 12 VDC Ground Remote Input Mode 2 Ch 4 Ch Input Voltage Low High Rem Offset Signal CH 1 CH 2 CH 3 CH 4 L R INPUT SE...

Page 19: ...rn On Mode CH 3 L CH 4 R CH 1 L CHANNELS 1 2 CH 2 R Filter Mode Filter Freq Hz Filter Freq Hz Off HP LP Filter Mode Off HP LP Input Type Input Sensitivity Input Sensitivity Stereo Mono Input Type Ste...

Page 20: ...retail and no warranties whether express or implied shall apply to this product thereafter Some states do not allow limitations on implied warranties therefore these exclusions may not apply to you T...