Nuforce with Stillpoints ERS fabric

I replaced the Nuforce with my Anthem amp and the buzz went away, That's how I figured out that it's the Nuforce amps.
I am only using balanced for the amps, I don't have balanced inputs anywhere else. It is not a dedicated line,but I will be having that done in the near future.
I have satelite tv and do not have this issue with anything but the phono playback.

Jdodmead,

I had the same problem with a pair of early vintage NuForce Reference 8 amps that caused noise in my phono stage. In fact I ended up selling that phono stage thinking it had some issues, but now I realize that it was the RFI from the NuForce amps that caused the noise. This was an expensive solid-state phono preamp. In that same system with the NuForce amps, a Musical Surroundings Phonomena phono stage worked fine -- I guess it had better shielding. Also, The TAD-150 tube phono seemed to be okay.

You didn't say which NuForce amps you had or which vintage they are. If they are the older Reference 8 amps, (below version 8.02) they probably don't have the RFI chokes on the speaker output wiring, in which case you can return them to NuForce and have the RFI supressor chokes installed.

If they are a newer model, and they have the chokes (you can see them if you remove the covers) then another approach would be to move the NuForce amps as physically far away from the BAT phono as you can manage. Perhaps use long interconnects and put them on the floor by the speakers. I have another system set up that way and there is no phono interference at all. But that one uses a MM phono preamp and not the higher gain MC phono amp. I think that if your NuForce amps have the supression chokes and you separate them from the BAT phono by a fair distance you shouldn't have any interference issues.

Good luck, and let me know how you make out.

Jdodmead,
I had a similar problem after purchasing a bel canto eVo6 which is also a switching amplifier. The amp forced me to clean up my AC. I removed all dimmers and flourescent lamps and installed a Dayton videa isolation transformer on my FM antenna cable lead and grounded my Marantz SR7200 chassis to my BBT PP1 power strip. My system is dead quiet now and I like the the amps power, tone, efficiency and the fact that it is good tool for testing the quality of your AC. I had ordered Stillpoints ERS cloth(6 adhesive sheets) before performing the above mentioned steps and it arrived after I had quieted my system. I lined the inside of my amp and Marantz DV8400 with the ERS Cloth anyway. I'm not sure if it made a difference but I have been very pleased with my system and have not had the urge to make any big changes.

My friend had a funny idea. Line the inside of a hat with the ERS Cloth. Has anyone tried this. I bet Harvey R. (Gizmo) would have.

ERS cloth on each Nuforce amp makes a significant improvement in my system. CAT preamp and Eidolon speakers and Shunyata King Cobras on everything.

Here's my guess: the NuForce amps are injecting RFI back into the power lines and emitting it in the air, so your BAT phono, which amplifies much smaller signals than line level, is most vulnerable. You can try installing a power conditioner (such as Exactpower or PS Audio products) where different outlets on it are isolated from each other, and use different outlets for the NuForce and BAT. On top of that, you can plug in noise filters into various AC outlets, like the Audioprism quiet line filters, AC Enacom and PS Audio Noise Harvester. Lastly, as Hals_den has mentioned, an isolation transformer should be able to completely isolate the amps (or phono) from AC noise. That takes care of the AC part.

Stillpoint ERS can partially filter out RFI/EMI emission from the amps, which is beneficial as well. There's also a device called Quantum Symphony Pro, which is designed to "neutralize" airborne RFI/EMI. It makes a big difference in sound, but I'm not sure if it removes the noise in your case. If you put all your gear on a rack, e.g., your phono in the middle and the amps at the bottom, you can stick a piece of u-Metal or copper foil at the bottom of the shelf supporting the phono, thus protecting the phono from being attacked from the bottom by the amps.

Good luck.