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Dedicated Line Noise Filter?

I don’t know if what I’m seeking exists, so I’m asking the experts.
I have 2 dedicated lines installed; one for analogue, one for digital. They originate at a sub-panel off the main circuit box. The sub-panel is connected by the hot lead and has it’s own ground including a second grounding rod. There is a home surge protector installed at the main circuit box.

I have passive conditioning on both lines for the components, yet I’m still hearing noise thru the speakers (from about two feet away). I live in a city and I suppose it could be dirty power from the grid.
Now to my question; is there a noise filter that can be installed at the site of the circuit panels? My electrician offered a surge protector with noise filtering (plus EMI/RFI), but was very expensive. So, is there a device that can be installed upstream to lower the noise floor?
Many thanks.
128x128lowrider57
lowrider57's avatar
lowrider57 OP
5,417 posts
 
After much troubleshooting I can confirm that both dedicated lines are extremely quiet. My preamp is emitting a low-level hum (even through a power transformer). Swapping preamps proved that the mains had no noise to speak of.
  So I will address this issue with the manufacturer, then hopefully move on to some "black-background" listening sessions.
Thanks again to all.
falconquest's avatar
falconquest
1,108 posts
 
I have a BPT 2.5 Signature Series and my system is dead silent. I just checked U.S. Audio Mart. This is the unit I would have purchased had I been able to find one used. I get your funds situation but this is an excellent buy. http://www.usaudiomart.com/details/649370283-equitech-2rq-20amp-balanced-power-transformer/

Here is the Equi=Tech price list confirming the price of this unit...
http://www.equitech.com/purchase/retailprices.html
gdnrbob
4,444 posts
 
@lowrider57 
That is good news for your wiring. As I said, your electrician seems like a stand up guy.
B
lowrider57's avatar
lowrider57 OP
5,417 posts
 
Yeah, he's a good guy. When he saw that I bought the Romex at Lowes, he said "save your money and return it, I'll use my wire n/c.
lowrider57's avatar
lowrider57 OP
5,417 posts
 
@falconquest , a couple of questions...
Can an analogue device plus digital be plugged into a balanced power conditioner w/o any digital noise transfer? Example, I know for a fact that my PSA Perfectwave bleeds digital noise back to the mains.

Secondly, what happens if an amp on a separate AC line is tied to the preamp in the balanced power unit?
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