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#1 Posted : Thursday, August 27, 2009 8:57:45 PM(UTC)

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One of my Counterpoint boards is producing a constant (and intolerable) "white noise" sound. The other board is silent. Both boards produce music.

When I press the top of capacitor C4 the noise increases in level.

I reflowed all of the solder joints and replaced the capacitor to no avail.

Any idea what the problem is and how I can fix it?


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#2 Posted : Friday, August 28, 2009 11:27:05 AM(UTC)

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I'm going to rotate the Counterpoint boards such that the inputs are adjacent to the Buffalo outputs. Hopefully shortening the wires significantly will squelch the noise.

What's a few more holes in the bottom of the chassis?

Edited by user Friday, August 28, 2009 11:27:48 AM(UTC)  | Reason: Not specified

Russ White  
#3 Posted : Friday, August 28, 2009 3:36:22 PM(UTC)
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Sometimes just adjusting the rails voltages a bit can make that kind of noise go away. The CFPs are high gain and can be finicky.
#4 Posted : Thursday, September 3, 2009 2:03:10 AM(UTC)

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shorten the leads from buf to counters as much as possible.
I guess you are not going symmetrical.
If so, and if let's say you are using out+ then try getting a short piece of cable (10 or so cm) from out- on each counter and wrap it around the cable from out+.
Or just fix it in the bottom of your box. Just fix it, not solder.

Also the orientation and paths of cables IS critical.
But you can make it quiet, eventually.

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