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Humming and static noise, Plinius SA 100 MkIII

Hello. I am currently using a pair of Plinius SA 100 MkIII's as mono blocks to power my B&W 802D's. First the amps have a slight hum when on and sometimes they are very quiet. More importantly, when I turn the volume up all the way without a signal from source, there is a very noticable high frequency hiss like radio signal distortation at the speakers. I have tried many things including changing preamps, cables, cords, etc but nothing worked. These amps generate 400 watts as mono so with the volume turned up all the way the noise may not be abnormal.

I would appreciate if any one with similar issue has an answer for me. I love the amps but the noise level is a bit too high. Note: in normal listening volume the noise is very low and not noticable at all only at vey high levels the noise is very noticable. Thank you.
espoverload
espoverload OP
14 posts
 
I tried everything I could and it appears the noise is from amp or some signal it picks up. The noise is there even when the CD player and the preamp are off. I also tried stereo mode rather than mono with no luck. I even tried without biwiering and still the noise is there. Now even at listening volume levels the hiss is there and getting more anoying by the minute. Thanks
espoverload OP
14 posts
 
OK. It appears the amps have some noise (barely audible). The preamp, when turned on, picks up the noise and amplifies it even with the volume at zero. The higher the volume the higher the hissing noise. CD player has no effect on the noise. Thanks
ngjockey
1,042 posts
 
Suckered again.

Disconnect cable from TV. Any noise?
Turn off all dimmer switches ...
Try without RGPS ...
...
newbee
4,767 posts
 
I agree with Ngjockey, I think your source of noise is external to your components. Sounds like your PC's/IC's are picking up some RFI.
stringreen's avatar
stringreen
6,436 posts
 
Plinius amps are noted for hum/noise problems. I had a friend that had these feeding Arial speakers. The hum was awful. He was told by Plinius that they are investigating a fix.
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