ALESIS 620 REFERENCE SPEAKERS

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

It's probably blown tweeters. But if you want to spend the money on a hipshot guess, try to find the the crossovers somewhere first; then find the readily available tweeters if/when that doesn't work out. Google "alesis monitor one MK2 tweeter".

You could test the tweeters by just removing one non-functional tweeter and wiring it directly to the speaker leads and with REALLY LOW volume containing NO BASS see if it makes any sound, which would prove it does/does not work.

Going forward, if the speakers sound stressed at high volume - THEY ARE. Too much power or too much distortion (overdriven amplifier) will kill speakers.

well, if you have aftermarket speakers with no amp, the radio may not have the power the speakers need and it clips at that volume to protect for damage. if you have factory speakers, I don't know what it would do that, the speakers would blow before the radio would clip if they were factory because the radio would have more than enough power to push them.

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..

if it is a factory radio then your factory amplifier is bad. if it is an aftermarket radio the outputs are clipping you possibly have a blown speaker ot too many speakers. then again the radio could just be about had it.

It could be a power problem, unless you have blown the driver ?, carefully pull out the power supply board, and look to see if anything looks melted, burned, or capacitors popped etc. Be carefull though as I do not want to be responsible if you get an electric shock, etc. preferably look and dont touch, just use common sense ;)

A couple of possibilities: Bad solder on power regulators (attached to main heat sink) or cooling fan may not be turning on when volume is raised.

have your built-in amp checked for trouble. there should be trouble in the output stage feedback loop. this is something to be done by a repair technician