JL Audio XD200/2 owner manual Appendix a, Necessary Equipment, Nine-Step Procedure

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APPENDIX A:

Input Sensitivity Level Setting Following the directions below will allow the

installer to adjust the input sensitivity of the XD200/2 simply and easily in just a few minutes using equipment which is commonly available in installation bays.

Necessary Equipment

Digital AC Voltmeter

CD with a sine-wave test tone recorded at

0 dB reference level in the frequency range to be amplified for that set of channels

(50 Hz for subwoofer channels, 1 kHz for a midrange application). Do not use attenuated test tones (-10 dB, -20 dB, etc.).

The Nine-Step Procedure

1)Disconnect the speaker(s) from the amplifier’s speaker output connectors.

2)Turn off all processing (bass/treble, loudness, EQ, etc.) on the source unit, processors (if used) and amplifier. Set fader control to center position and subwoofer level control to 3/4 of maximum (if used to feed the XD200/2).

3)Turn the “Input Sens.” control all the way down.

4)Set the source unit volume to 3/4 of full volume. This will allow for reasonable gain overlap with moderate clipping at full volume.

5)Using the chart on this page, determine the target voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs.

6)Verify that you have disconnected the speakers before proceeding. Play a track with an appropriate sine wave (within the frequency range to be amplified by the XD200/2) at 3/4 source unit volume.

7)Connect the AC voltmeter to the speaker output connectors of the amplifier. If the channel pair is operating in stereo, it is only necessary to measure one channel. If bridged, make sure you test the voltage at the correct connectors (L+ and R–).

8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter.

9)Once you have adjusted the XD200/2 to its maximum low-distortion output level, reconnect the speaker(s). The “Input Sens.” controls can now be adjusted downward if the amplifier requires attenuation to achieve the desired system balance.

Do not increase any “Input Sens.” setting for any amplifier channel or channel pair in the system beyond the maximum level established during this procedure. Doing so will result in audible distortion and possible speaker damage.

It will be necessary to re-adjust the “Input 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, including source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment.

Nom.

Target AC Voltage

Impedance

Stereo

Bridged

 

 

 

 

17.4 V

34.8 V

 

 

 

17.4 V

32.8 V

 

 

 

17.4 V

28.2 V

 

 

 

16.4 V

not recommended

 

 

 

14.1 V

not recommended

 

 

 

12 JL Audio - XD200/2 Owner’s Manual

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Contents 200W 2-Channel Amplifier Installation Applications Protect Your HearingSerial Number Planning Your Installation Safety ConsiderationsCooling Efficiency Considerations A fan. In normal applications, fan-cooling is not necessaryProduct Description Securely mount the amplifierPower Connections Fuse RequirementsTURN-ON Lead Input SectionInput Voltage Range Input Sensitivity Control To achieve the desired system balanceFilter Controls Most speakers are not designed to reproduceRemote Level Control Optional PreoutsSpeaker Outputs Or a summed mono center channelProblem and turn the volume up Servicing Your JL Audio AmplifierJL Audio Technical Support Nine-Step Procedure Appendix aNecessary Equipment Turn the Input Sens. control all the way downAppendix B  Appendix CAppendix D Troubleshooting My amplifier doesn’t turn onMy amplifier turns on, but there is no output INSTALLATION NOTES Page Page Page Limited Warranty Amplifiers USA If you need service on your JL Audio productJL Audio, Inc International Warranties