1 Attachment(s)
I like to call this Thread:"the thread that won't go away.."
But I felt I'd post my solution to the issue and the pictures . This picture was before the sheetrock was reinstalled (which I just found in an archive file)
I previously posted;
I isolated all my equipment by adding an isolated 15 kVA transfomer. That'll give you 5 to 6 20A circuits. it requires a 60A 240V amp breaker off the mains, feeding a primary coil (in us=120/240V). The 2nd transformer has its own isolated ground (to an 8' grounding rod through my garage floor) with its own 100A 120V breaker and 5 20A secondary circuits each at 120V.
Once plugged in to the 2nd transformer, the audio equipment is COMPLETELY isolated from every mother loving fan ,computer, clock, or electrical device on the main breaker box.
Results>>>>bingo all hums eliminated, and I have 15 amps, so it works. It also helps to use balanced audio connections only. But the you knew that.
I worked on these problems for two years, this solved all issues associated with hum and electrical interference, and is sure fire >> at a cost of 400US.
See the attached picture. This completely eliminated any ground loop hum, although running the #4 wire through the conduits was tough. The 15kVA transformer was goof to 125 amps (6 x 20A) ; but as stated I'm only using 5 x 20A. You'll notice this picture was taken when 4 of the 5 20A circuits still needed to be wired in, as the yellow 12G romex going up the right side of the larger(mains) breaker box is the 5 isolated 20A circuits in the room above. You'll also notice the bottom plate hadn't been placed on the transformer either when this picture was taken.
My only comment is I might have saved a few $ by doing it myself; when when the wife & I head for retirement in Oklahoma in 9 years; I'll hire this done next time, as it occupied the better part of two weekends when I did it.:D