Tphaliaros,
You said monoblocks. Both buzzing? If so, I don't know what the odds of both amps having a xformer failure at the same time are but I'll bet it's real low.
I had the same problem with a big Krell and a trip to the factory and a huge sum of money replaced the xformer and the buzz was gone. I hope you are not plugging your amps into the P300. I use a P300 on my front-end also and I know that it's not large enough for any kind of high current loads.
If you are starving the amps for current, the xformers could be complaining. Do you have dedicated circuits? Maybe not necessary but always better. Also, It could be as simple as loose wiring connections at your circuit breaker. These connections should be tight. If extremely loose you may be able to actually feel heat build-up on the front of the breaker. These should be checked. If you aren't comfortable doing this yourself get and electrician. It's tough to listen to music if you are dead unless you listen exclusively to harp music. Check the wiring connections at the outlets too, to be sure they are sufficiently tight. Loose connections can create a high resistance creating heat gain and can limit current to your amps. Especially if they are big.
Good luck,
Woodrow
You said monoblocks. Both buzzing? If so, I don't know what the odds of both amps having a xformer failure at the same time are but I'll bet it's real low.
I had the same problem with a big Krell and a trip to the factory and a huge sum of money replaced the xformer and the buzz was gone. I hope you are not plugging your amps into the P300. I use a P300 on my front-end also and I know that it's not large enough for any kind of high current loads.
If you are starving the amps for current, the xformers could be complaining. Do you have dedicated circuits? Maybe not necessary but always better. Also, It could be as simple as loose wiring connections at your circuit breaker. These connections should be tight. If extremely loose you may be able to actually feel heat build-up on the front of the breaker. These should be checked. If you aren't comfortable doing this yourself get and electrician. It's tough to listen to music if you are dead unless you listen exclusively to harp music. Check the wiring connections at the outlets too, to be sure they are sufficiently tight. Loose connections can create a high resistance creating heat gain and can limit current to your amps. Especially if they are big.
Good luck,
Woodrow