Question about Alesis M1-Active MkII Main / Stereo Speaker

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

These are fairly new monitors. not long ago the left speaker started emitting a very high-pitched whine that changes pitch/volume when standing in front of it. It sounds very much like feedback but im pretty sure its not. It's just the one speaker and it's not the cord. It happens even when the speaker is unplugged and when connected to different preamps or no preamp. whats happening??

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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

Posted on Apr 11, 2008

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Hi Tom, I have the exact same problem with one of my M1active 620 speakers. Awful high pitched sound when the power cable is plugged in, even if the speaker is off. Did you ever find a solution? It's driving me mad.

Posted on Sep 04, 2016

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Posted on Jan 02, 2017

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1 Answer

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

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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.

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

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1 Answer

Woofer doesn't work


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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1 Answer

Alesis M1 Active Mk2 Speaker won't Power Up


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

Apr 14, 2009 | Alesis M1-Active MkII Main / Stereo...

1 Answer

Alesis m1 mk2 active emits low pitch hum and does not work


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

Mar 13, 2009 | Alesis M1-Active MkII Main / Stereo...

1 Answer

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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

Jan 14, 2009 | Alesis M1-Active-MK2 Powered Studio...

1 Answer

Speaker will not turn on


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

Nov 28, 2008 | Alesis M1-Active MkII Main / Stereo...

2 Answers

ALESIS M1 ACTIVE MK2 CONE VIBRATION!


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!

Mar 17, 2008 | Alesis M1-Active-MK2 Powered Studio...

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