Alesis M1-Active left speaker emitts a very high pitched wine that sounds like feedback

You just fix the power supply and Brige and check the transformer

There clearly is a fault in the sub's amp section. It's probably the main part that does most of the work. It will need to be replaced.

I see from the manual there are several controls on the speaker that could affect the sound in the way you describe (gain, hi- and mid-boost, acoustic space). Why don't you compare the actions of each control with the working speaker as the standard and a test tone or FM noise as the source? It might help you to identify a specific internal function that has changed. After that, someone's going to have to crack it open and do surgery.

You might also try using the opposite input (TRS vs XLR) than the one you're using. It might reveal something.

Thanks for following up...I took it to get fixed..$150.00 later it works..

sounds like the voice coil could be open or damaged. the woofer can be reconed. reconing replaces all the moving parts in the speaker frame returning to new condition in most cases.
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Hi, This is usually the Capacitor C8 on the powerboard it usually bulges and pops, its becuase its right next to a resistor which gets very hot and sometimes puts the capacitor into meltdown, yours might have gone past that stage but this is worth a look; http://www.neufeld.newton.ks.us/electronics/?p=232

Hope this helps

Cheers

Steve

You need to take a closer look really, see if anything on the power supply board inside has melted, burned, popped, etc.

Hi Mate, This seems to be a common problem now, go here looks like you need a new capacitor or two, possibly a resistor aswell depending.

http://www.neufeld.newton.ks.us/electronics/?p=232

Actully the problem is your speaker which is shorted. The speaker assembly or the one who crashed out always, when you excited the volume to max it feedback to amplifier Ic to cut the fuse blown. The amperage goes up and sent to either left or right amplifier power supply.
Even you replace the fuse with a new one it will repeat the situation and story.
later sooner it will damage more.

r_ic7

Hello!
my speaker Alessis M1 Active 620, with a roar is very strong in the speaker, the potentiometer does not attenuate, change the volume. Ja switched capacitor C8, based on my research of other users, but got no result. When you press the power button, the LED lights in blue, and even change the color to red, producing a noise (snoring) very strong.
help!
Please help me!