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Need schematic or common failures for P200 Subwoofer?

Have a Cambridge Soundworks P200 subwoofer that was repaired a few years ago for emitting a high pitch sound at certain frequencies. I contacted the company and was told that they have no schematics that they could send me.

I looked online but have had no luck. The speaker seems to work find when cold but after it warms up it starts to fail. Does anyone know were I could get schematics for it, or advice on common failures for this model subwoofer?

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In my experience with subwoofers they tend to get really hot in use due to them being sealed. This tends to lead to failure of capacitors(mostly the electrolytic ones). Which exhibit problems when they warm up. IE. they don't filter the power correctly(or block DC) so the switching supply leaks its noise into the circuitry. If you had it repaired a while ago you might have brought it to a shop that uses cheap caps that will only last 1000 hours or less, therefore they might be bad again. Or they might have only replaced the bad ones, not all of them. My suggestion is to replace ALL the electrolytic caps. I recommend the UPW or UPM Nichicon electrolytics as they have a 5000+ hour lifespan at a decent price point. You will need no schematic to do so, just patience and a decent soldering iron. Hope that helps. I can expound more if you need me too. Thanks

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Speaker voice coils are made of copper or aluminum. As these voice coils increase in temperature during normal operation, the DC resistance of the voice coil increases. Greater voice coil resistance means less power transfer from the amplifier. As a result, the speaker will not play as loud when it's "warmed up" as it did when it was "cold". Some speakers may exhibit 3 to 6 dB of power compression. This means that power compression can have the same effect as taking away half of your PA!

How do I select the correct wire gauge for my speakers? Selection of the appropriate wire gauge is important to system operation. A cable that's too "light" will result in amplifier power being wasted due to the series resistance of the cable. It will also result in the loss of low-frequency performance due to a degraded damping factor. On the other hand, a cable that is too "heavy" is unnecessarily awkward and costly.

Here's a great article on understanding your speakers: http://www.jblproservice.com/general_faq...

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