Just finished a speaker build and I have a buzz that needs to go.

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Just finished a Zaph Hi-Vi B3s for my computer. It has a buzz on certain notes, when just moderately loud.. So I tried two other speakers , they all buzz. So I checked for a ground loop , moved them away from the amp which is a small Lepy LP-2020A and the computer but it still buzzes. What should be the next step. Thanks. By the way, other then the buzz the little speakers are sweet.
 
Since this occurs with different speakers it would indicate the buzz is coming from some source other than the speakers. It would be a bit odd for the electronics to only buzz at a specific frequency, are you sure it's not something else in the room resonating at that frequency? If you you hold the speaker off the table do you still hear the buzz, if so is it coming from the actual driver?
 
Ground loops can be trickier to resolve than you think, - I've had systems with a total of half a dozen components connected and found that a culprit has been shield on cable TV coax feed not properly grounded to AC mains panel. Disconnect it, or isolate with appropriate filters, and it goes away.

Try feeding your amp with signal from a DC powered mobile device such as iPod, phone, etc. to isolate if it's upstream.
 
The idea is to decouple your PC from amp completely. So the source chain is PC > SPDIF (optical) > DAC > AMP.

As chrisb already suggested try using a battery-powered source like a mobile phone instead of your PC. Are you using built-in PC sound card? If so, you can try a USB DAC.
 
Well after a couple of days , I realise that through my Nakamich amp it sounds fine, in fact these two Zaph designed speakers are amazing. I haven't put fiberglass insulation in them yet and I'm looking forward to see if that improves them even more. If I decide otherwise, I'll do a DAC. thanks for the help everyone.
 
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