Amp protection question update - I have Cambridge audio Topaz SR10

Find out what is causing the protection light to turn on. Troubleshot down to the component level.

You may be confusing an ordinary sub with a powered one.

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Sounds like the potentiometer is worn u will have to buy a new one they r cheep $3 to $6 dollars u will have to remove it and find out what it is in ohms or k/ohms it will b marked .::::::: but before u do this if u buy a can of CRC electrical contact cleaner or similar give it a spray in the gap on the control pot it might save u having to buy one .if it is not worn to badly. Good luck

amps like this only power down when there is a problem with the amp, usually a shorted output stage, but could also be shorted speaker wires or damaged speakers, it's a self protection mechanism

do you get sound from both speakers before it powers down?? if you do it is definitely an internal problem so take it to a repair facility,,,

if not check the speaker cables & the speakers themselve

What ohm rating does the receiver have and what ohm speakers are you connecting. If the receiver is rated for 8 ohm speakers and you are connecting 4 ohm speakers, you are overdriving the amplifier. This will cause the protection to trip. Also make sure your speakers polarity are matched. If they are out of phase this may also cause a problem.

You are overloading your amp. IMO 640A cannot handle heavy loads.

Better change the speaker combo and connect something that puts right load on the 640A. Else, get a meaty amp from CA.

Looks like the fuse blown.. or the classic symptom of electrical fault inside the amp. 640A uses a sensitive protection circuit often ends up in this irritating situation. Normally, there is nothing much you can do, but just check your wall plug connection for Open Ground or Left & Neutral reversed issues. If the wall plug is free of error, then you should better contact CA technical support.

The fault is on the amp! It sounds like the protection circuit is detecting a surge on the channel and shuts it down to protect the speaker. I would check the semiconductor device(s) for the right channel on the heatsink of the amp. You might even see damage of burning on one!

Put teh wire of the cable in the side of the plugs once you have untwisted them - they dont come out.