Question about Boston Acoustics BA735 Computer Speakers

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My B/A 735 speakers were working fine then a hum started for a day or 2 & they totally quit working. Power supply is OK & other speakers work on my computer. Where can I get the control board repaired & how much would it cost?

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If your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager scroll to sound,video and game controllers you might see a yellow question mark? Right click to reinstall drivers
click start control panel sounds and audio,volume,advanced,speakers make sure you have selected the
(((appropriate speakers))) also audio you will find 3 drop down lists make sure you have the correct settings there
also
click start control panel sounds and audio devices you can adjust the volume there also select speaker volume you can change your settings there you can also tick in the box place icon in taskbar
if his does not fix the problem

have you tried this control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or navigate to the device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable) also you might check
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the sound card and the CPU central processing unit dust causes static to build up in a computer
hope this helps don

Posted on Mar 11, 2011

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1 Answer

When turning up the volume speakers start to humn. Tried on all inputs still humming. Sound comes out but humming is there. Humming only stop when turning the volume all the way down.


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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.

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