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

Showing 1 response by davehrab

Are we getting a little ahead of ourselves in recommending iso and regen type power conditioners assuming the noise at 2 feet in front of the speakers is being caused by coupled or conducted EM/RF

What if the electrician failed to bond the second ground rod off the new sub panel to the main ground rod at the house's main service entrance ... cable guys do this all the time = ground loop

What if electrician didn't place both dedicated lines on the same phase in the main panel box as he was only trying to be diligent and balance the load evenly in the panel box = ground loop

What if electrician's apprentice after consuming large amounts of Gin and Corn Chips for lunch failed to tighten or fully insert the neutral wires into the audiophile grade outlets Lowrider57 spent so much money on or if he was careless in pushing those expensive outlets back in the wall and loosened up the neutral wire = lack of continuity = major buzzing

What if Lowrider57 switches interconnects and components frequently and has broken a return lead in one of the ICs or has loosened up one of the male chassis RCAs losing ground = Buzzing

What if Lowrider57 has lost a power supply cap or has a cracked solder joint in one of his component's = buzzing

Will a power conditioner of any type remedy any of this ?

I just lost a 4 year old premium Nichicon power supply cap in my amp and I'm still in denial = buzzing and crying :-(

Shouldn't the first step to problem solution be problem identification

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