JL Audio 98621 - Manuals - manualsarea.com

Page 4 - PRODUCT DESCRIPTION; The RD400/4 can be operated with a wide; TYPICAL INSTALLATION SEQUENCE; The following represents the sequence

4 | JL Audio - RD400/4 Owner’s Manual PRODUCT DESCRIPTION The JL Audio RD400/4 is a four-channel, full- range audio amplifier utilizing JL Audio NexD™ ultra-high speed switching technology to deliver outstanding fidelity and efficiency. The RD400/4 can be operated with a wide variety of source units...

Page 5 - POWER CONNECTIONS; FUSE REQUIREMENTS

5 POWER CONNECTIONS Before installing the amplifier, disconnect the negative (ground) wire from the vehicle’s battery. This will prevent accidental damage to the system, the vehicle and your body during installation. INPUT SEC TION (L) (R) Left or Mono Right Only CH. 1&2 CH. 3&4 CH. 3 (L) CH...

Page 6 - The RD400/4 can be switched on and off using; If a source unit does not have a dedicated; These methods are useful when a conventional; DC Offset-Sensing: The amplifier will turn on

6 | JL Audio - RD400/4 Owner’s Manual TURN-ON OPTIONS The RD400/4 can be switched on and off using one of three methods, determined by the position of the amplifier’s “Turn-On Mode” switch. Please read these options and decide which is best suited for your specific system. 1) +12V remote turn-on lea...

Page 7 - INPUT SECTION; INPUT VOLTAGE RANGE

7 INPUT SECTION The RD400/4’s input section allows you to send signals to the amplifier section through the use of two or four differential-balanced inputs. Input connections are via two pairs of traditional RCA-type jacks. INPUT SEC TION (L) (R) Left or Mono Right Only CH. 1&2 CH. 3&4 CH. 3...

Page 8 - FILTER CONTROLS; Most speakers are not designed to reproduce

8 | JL Audio - RD400/4 Owner’s Manual INPUT SENSITIVITY CONTROLS The control labeled “Input Sensitivity” and “Clipping” LED are used to match the source unit’s output voltage to the input stage of the RD400/4 for maximum clean output. Rotating the control clockwise will result in higher sensitivity ...

Page 9 - Tuning Hint: If you are using the RD400/4; PREOUTS; The RD400/4’s speaker outputs are designed

9 Tuning Hint: If you are using the RD400/4 to drive a subwoofer system (“LP” mode), a component satellite speaker system (“HP” mode) or both, 80 Hz is a good baseline “Filter Freq. (Hz)” setting. After properly adjusting the “Input Sensitivity”, as outlined in Appendix A (page 14), you can fine tun...

Page 10 - BRIDGING CONSIDERATIONS; Bridging is the practice of combining the; STATUS LED / PROTECTION CIRCUITRY; There is a bi-color LED light strip on the top; functioning normally, audio output is active.

10 | JL Audio - RD400/4 Owner’s Manual BRIDGING CONSIDERATIONS Bridging is the practice of combining the output of two amplifier channels to drive a single load. When bridged, each channel produces signals of equal magnitude, but opposite polarity. The combined output of the two channels provides tw...

Page 12 - Crossover Setup for Bi-Amplified System; MULTI-AMPLIFIER SYSTEMS; Here are three possible configuration options:

12 | JL Audio - RD400/4 Owner’s Manual B) Fade Subwoofer Level vs. HF Level Req uired: a source unit or processor with two pairs of stereo outputs. Inp ut Connections: the first stereo pair of source unit outputs is connected to the “CH 1 (Left)” and “CH 2 (Right)” inputs of the RD400/4. The second ...

Page 13 - right and dedicated subwoofer outputs.; SERVICING YOUR JL AUDIO AMPLIFIER; If your amplifier fails or malfunctions, please

13 “Input Sensitivity” settings and will not be user adjustable from the front of the vehicle. B) Subwoofer Level Control Only: Req uired: a source unit or processor with left, right and dedicated subwoofer outputs. Inp ut Connections: The main stereo pair of source unit outputs is connected to the ...

Page 14 - Follow the steps below to adjust the input; Necessary Equipment; • CD with a sine-wave test tone recorded at; The Seven-Step Procedure; amplifier’s speaker output connectors.; It will be necessary to re-adjust the “Input

14 | JL Audio - RD400/4 Owner’s Manual APPENDIX A:Input Sensitivity Level Setting Follow the steps below to adjust the input sensitivity of each amplifier channel pair, simply and easily, in just a few minutes to achieve overall system balance. Necessary Equipment • CD with a sine-wave test tone rec...

Page 15 - Rated Power at 14.4V with less than; Signal to Noise Ratio:

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 MethodStereo, all channels driven: 75W RMS x 4 @ 4 ohms, 100W RMS x 4 @ 2 o...

Page 16 - driving a load equal to or greater than 2 ohms.; “My amplifier’s output fluctuates when I tap on it or hit a bump.”; contact with the input jacks on the amplifier.; APPENDIX C: TROUBLESHOOTING

16 | JL Audio - RD400/4 Owner’s Manual “How do I properly set the input sensitivity on my amplifier?” Please refer to Appendix A (page 14) to set the input sensitivity for maximum, low-distortion output. “My amplifier doesn’t turn on.” Check the fuse, not just visually, but with a continuity meter. ...

Page 20 - If you need service on your JL AUDIO product:; (do not send product for repair to this address); International Warranties:; by that country’s distributor and not by JL Audio, Inc.

LIMITED WARRANTY - 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 Connecti...