Question about Alesis M1-Active MkII Main / Stereo Speaker

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Oops! hello i left my speakers on whilst i was doing something else and my laptop decided to go to sleep and one of my speakers made a ftttt noise and now it wont turn back on, have i blown something? can i repair it myself? advice would be great! thanks davina

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It could have triggered a signal to your powered speakers that was not able to handle it. you may busted your output stage (power amp) and went on standby protection mode.

Posted on Apr 11, 2008

  • J. R. Oct 20, 2011

    How do you remove the Protect Mode ??



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Yamaha hs50m

Make the sure the cables are connected properly to the monitors, as in Left Positive to Left Positive, Left Negative to Left Negative on both ends of the cable. Having one polarity switched can burn out your speaker and internal electronics.... I'm speaking from experience. When you burn up a $400 speaker by incorrectly connecting them... it's a big OOPS that makes you feel pretty dumb. Even as a professional A/V guy, it happens.... and sucks. If this doesn't fix the problem, contact Yamaha or an authorized dealer about it. Could be bad electronics internally, but my guess is it's the cables being improperly connected.

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You are getting DC offset voltage on one of your amplifiers that is the reason the speaker pushes out and you might be hearing a humming noise too. Do not turn on the speakers till you get it fixed or else you would end up burning the speaker voice coil too.The dim blue LED is also an indication of a short circuit in the output stage.
Your left amplifier needs a output chip (IC ) replacement. You will need professional help to do that. Will cost you about 20$ plus service charges.

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thrust bearing ,whilst its working ok leave well alone as it will involve removinig the gearbox ,it could run with this noise for years so dont loose sleep over it ,and even if it does break you can still drive the car home with no clutch ,just start it in 1 gear then when speed right it will just slide back into next gear ,trust me here as do you think old ford thames trader trucks had syncros or a two stroke diesel commer ,OOPS showing my age here

Mar 05, 2011 | Ford Fiesta Cars & Trucks

1 Answer

The noise is certainly not coming from the speaker as I have muted it. The noise more like a low frequency noise, I am not able to decide whether it is from the fan or from some other components

Hi. Check for outside sources that might be causing the static noise. The laptop might be near an Electro-magnetic emitting device like a high-powered lamp or speakers or wireless phones or even a device with a running motor.


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1 Answer

I have a Toshiba equium p22d 139. Occasionally the screen blanks out whilst the computer remains on. I have to restart the computer to get rid of the blank screen. Have you any ideas what the problem could...

Will sounds like your working with good equipment What it may be is a failing vcu on the motherboard
you may try getting something that doesn't let the screen sleep but it might drain the laptop battery

Oct 19, 2009 | Computers & Internet

1 Answer

Loud noise from speakers when laptop closed/standby

Hi there.
Your microphone is on, and when you close the lid it is closer to the speaker. It needs
a loud noise (like closing the lid faster) and it enters into a feedback loop.
We need to find a way to make the microphone not play back.
Try left clicking on the speaker icon in the bottom right of the screen, and click playback
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Good luck

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While closing the laptop without switching it off the laptop normally goes into sleep mode, thats happeninig, but a whistling noise is coming in my laptop while closing it, also when i touch or tap on the...

It seems that microphone is on.
To turn it off, double click on volume icon on lower right corner of windows taskbar and then click on mute option for microphone

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1 Answer

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It would probably be with the speaker. That is easily checked by simply unhooking the speaker and running the test again.

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sounds a lot like you have a speaker that's crying for removal and could try to use the volume slider, with the left/right balance, and see if it's generic to the system, or just one particular application. sounds like it's happening all the time your computer is on

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I need help with my docking station (speakers)

Most docks not compat
could be hardware issue - replace

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