Question about M-Audio Studiophile BX8a Speaker

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Humming BX8 I have not opened it up yet. I would like a schematic on it before doing sol I doubt it being a cracked speaker cone, etc. They have not been driven that hard. I suspect capacitor probelm in the the prower supply but wthout a shenmatic, I am hesitant to starr poking around in there. Could I carry it to any shop that works on amps like guitar, bass, etc? I am not afraid of trying it myself if I know what is in there. I have worked on power supplies many time before in the old days with TVs. John

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Hi,

I would have to agree on the possibility of the power supply/capacitor, zener,/regulator and/or diodes.. I sincerely doubt if the circuitry inside would be that too complicated and expect that you can wing it. Other than the power supply, perhaps you may also consider:
1. grounding/shielding of the signal input; and
2. a partial short in the amp section thereby drawing excessive current which would result to the humming sound.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 25, 2008

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Hello docjgg,

This sounds like it may be a loose connection (ground) generation common mode noise or it may be a capacitor in the power supply going bad and not providing enough filtering of the AC voltage (allowing for 60 cycle hum). You should get a schematic for the speaker or just take some rule of thumb measurements of the power supply output, with an oscilloscope (you will be looking for ripple voltage, what you could do is use one of your good speakers as a comparison of good to bad.

If you do not want to work on this yourself, you could take the speaker to any TV repair shop or audio repair shop.

I hope this helps

Thank you,

Shuttle83

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