Hum issue - driving me more crazy

But there is constant low level hum - right side only EVEN with preamp and XOVER turned off.

I agree with Gs5556. Try some ground cheaters.

Just because you turned off the preamp and xover that would not break the ground loop current path through the right channel amp.

Have you tried to isolate the right channel amp from all other equipment? Nothing connected to the input of the amp... That would tell you if the low level hum is caused by the amp or not.

"Bringing the IC to the right amp TO ABOVE the floor-> RESOLVES NOISE. In my unknowing frog brain, this implies something is inducing noise in the right sided IC (when under the floor - down about 12-16" is all though)."
05-26-11: Imdoc

Imdoc,

*How long is this IC cable?
*What type of cable supports are used under the floor? Plastic? Metal?
*How often is the cable supported, distance between supports?
*What is the area, space, under the floor? Basement? Crawlspace?

Ozzy,

I don't think the Iso-Max VRD-1FF will work on a SAT dish
system.

...I've checked and made sure the dish is grounded properly;
05-31-11: Mribob

Mribob,

Properly.... Please explain.
jim

Mribob,

how come my bedroom sat system has no ground hum;

More than likely the associated equipment is two wire cord and plug. Is that correct?

I switched out my Meridian 861 processor for a Marantz 7005 processor;(no hum before with same sat box and connections)

Marantz uses a two wire cord and plug. Does the Meridian 861 processor use a three wire cord and plug?

I had electrician come out to house and attach dedicated ground wire to a grounded piece of metal on house; ie; electrical conduit.

Does not meet NEC code......

Good chance what you have with the metal conduit is a poor lightning grounding conductor at best. Every fitting, connectors and couplings, could be adding resistance to the length of the conduit run.

NEC code says the cable grounding block shall be bonded, connected, to the main grounding electrode system of the main electrical service by means of a ground wire. NEC code is bare minimum safety standards.....

How far is the SAT cable grounding block from the main electrical service panel?

For a test, test only, disconnect the existing pipe ground wire from the SAT cable ground block. Check for hum and post back.

Note:
The ground block must be earth grounded for lightning protection. For the test you will not cause any harm....