2. misc-audio
  3. 1408308374

Amp buzz in speakers

I have an Aragon 4004 MkII amp, brand new Yamaha Aventage RX-A1040 receiver, with B&W 802 Series 2 speakers. I recently installed the system in a new rack system and am pretty sure there is very subtle yet audible hum/buzz coming from both speakers. It doesn't sound like a ground loop as the noise is coming from the mids and tweets as well as the woofers. I'm only mentioning these components as I believe I have narrowed it down.

With only the amp turned on(same with receiver turned on), the sound exists. Volume adjustments have no effect on it. Turning off the receiver has no effect. If I unplug the input cables to the amp, the sound goes away completely. If I unplug only 1 input cable, that channels sound goes away. I've tried different interconnects and all product the same buzz/humm. I've checked for nearby power cables, wall worts, etc, but nothing is close to them. I've also unplugged each of the other source components with no difference.

If anyone has any recommendations, I'm all ears!!

Thanks,

d
dastro
dastro OP
42 posts
 
I just tried an adapter without a grounding plug on it. The hum/buzz was much less noticeable. With it, there was no noise coming from the mids and tweets, only from the woofers. There is still a low level hum, but much better. This was done with a polarized adapter. Should I change out the outlet?

Thanks.
plato
1,543 posts
 
Don't change the outlet. Flip the interconnects to the amp around the opposite way and see if the hum lessens.
dastro OP
42 posts
 
Just flipped the interconnects, no changed. As mentioned, noise exists even when interconnects are disconnected from receiver's preamp outs.
Post removed 
morganmadden
36 posts
 
I had a similar problem when I had my Lexicon RX7 connected to my Yamaha CXA-5000. I lessened it substantially by running a stiff piece of copper cable from the ground on the back of the Lexicon to the ground connection on the Yamaha. It's not totally gone, but it's barely audible, so I quite pleased. I will be watching your post, for any tips other members might contribute...
More to discover