Question about Crown-Audio XLS 402D Amplif 300 with 8o 450 with 4o XLS402D

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My crown amp (model xls 402) lost sound and the fault light came on

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Chances are you have a failure in the final amp stage.

Check the voltage on the buss where the output transistors merge via the equalizing resistors. The voltage here should be very near zero.

Posted on Jun 03, 2010

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Our sound system runs two separate xl 5000 crowns individually to 2 srx728 subs(2241hpl speakers). Amps are run bridged and have been connected to "discrete" inputs on cabinets (I think this is...


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My crown Itech 4000 left channel is phasing in and out. Could it be a collection of dust problem?


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This probably means there is a failure and the internal protection circuits have activated. It will probably have to go to a shop for repair.

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Very carefully... SInce the outputs are not specified as isolated, your speakers would be connected across the hots and the returns would be jumpered.
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Nov 28, 2010 | Crown-Audio XLS 402D Amplif 300 with 8o...

1 Answer

Crown XLS402 amplifier will not work


It is probablly in protect mode due to a failure. This prevents blowing your speakers.

You will need to have or do servicing on it. First verify that you can unplug ALL INPUTS and that speakers are connected and problem of the protect LED exists. A bad input MIGHT be causing this due to a ground loop.

Make sure NONE of your speaker leads are grounded or shorted.

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1 Answer

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Most likely the power supply has failed. Could be any component in the power supply section. Best to have a competent tech. check it out.

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