Dan_ed
If you are going to lift the ground (cheater plugs) try to do that on the preamp and let everything ground through the amps. >>>>>>>>Will try but I think this worsens other hums
If you haven't already, try to plug both amps into the same outlet and see if the hum is diminished.>>>>>>NO help
Matter of fact, you may need to plug everything in your system into one outlet to see if this helps even more.>>>>>>>>Will try
Try swapping the ICs between amps and see if the hum follows the change. >>>>>>No help
When you can, try turning off all of the breakers in the house except the one feeding your system and see what happens. >>>>Have tried without obvious source as I recollect but will try again
Jea48
*How long is this IC cable? >>>~ 15'
*What type of cable supports are used under the floor? Plastic? Metal? >>>>>>>>Blue flex hose supported with plastic hangers
*How often is the cable supported, distance between supports?
>>>>>>>>About 5' apart as I recollect
*What is the area, space, under the floor? Basement? Crawlspace?
Space is under entire first floor of house ~ 1800' I guess
Room is 15X20 -sort of isolated from other parts of house Crawl space is ~ 18" dirt to bottom of rafter
Magnumpi205 - > I don't disagree and will try this
Shayl123 - I have -> no help
Rwwear -> I have -> no help
BUT I replaced right channel with balanced IC's tonite AND SO FAR NO NOISE. Can even use the dimmers in room that were clearly problematic. Able to remove the cheater plugs without hum (which was an issue before)
Not ready to declare victory (as there was variation in level of hum) but things are looking up so far.
MAGIC SO FAR
If you are going to lift the ground (cheater plugs) try to do that on the preamp and let everything ground through the amps. >>>>>>>>Will try but I think this worsens other hums
If you haven't already, try to plug both amps into the same outlet and see if the hum is diminished.>>>>>>NO help
Matter of fact, you may need to plug everything in your system into one outlet to see if this helps even more.>>>>>>>>Will try
Try swapping the ICs between amps and see if the hum follows the change. >>>>>>No help
When you can, try turning off all of the breakers in the house except the one feeding your system and see what happens. >>>>Have tried without obvious source as I recollect but will try again
Jea48
*How long is this IC cable? >>>~ 15'
*What type of cable supports are used under the floor? Plastic? Metal? >>>>>>>>Blue flex hose supported with plastic hangers
*How often is the cable supported, distance between supports?
>>>>>>>>About 5' apart as I recollect
*What is the area, space, under the floor? Basement? Crawlspace?
Space is under entire first floor of house ~ 1800' I guess
Room is 15X20 -sort of isolated from other parts of house Crawl space is ~ 18" dirt to bottom of rafter
Magnumpi205 - > I don't disagree and will try this
Shayl123 - I have -> no help
Rwwear -> I have -> no help
BUT I replaced right channel with balanced IC's tonite AND SO FAR NO NOISE. Can even use the dimmers in room that were clearly problematic. Able to remove the cheater plugs without hum (which was an issue before)
Not ready to declare victory (as there was variation in level of hum) but things are looking up so far.
MAGIC SO FAR