how many folks have +10kVA trannys before the rig?

Rhyno,

There are many benefits to proper selection and installation of iso transformers in your system. Besides reducing noise and creating a blacker background, I have found they eliminate grounding issues and the need for any further PCs, and make the system much less sensistive to cable/wire swapping.

See my system page below and the pictures and diagrams.

Here are some keys: Balanced configuration is OK but not necessary. Iso must be iron core (the heavier the better), and rated 2-3 times your peak power demand. Follow electrical codes for a subpanel and grounding.

Jeffcott, if by "downstream iso", I assume you are referring to the small 125va iso on the CD dedicated line. That iso, while next to the subpanel and large iso, is only 15 ft. from the CD player. Note that I mounted it at right angles to the main iso to minimize any cross coupling. I have tried the small iso in the room on the CD, and tried it as presently mounted, and could not perceive any difference. Note also that the class D amps in each speaker are on dedicated lines but not through the main iso.

Jeffcott,

No disrespect taken. My comments were mearly directed at trying to pass what I learned when experimenting with the small iso location.

WRT to the desirability of having an iso in the living environment, while the small iso is virtually inaudible and only slightly warm to the touch, the large iso can easily be heard from several feet away, and is quite warm to the touch. Hence, I decided to locate both isos on the block wall just outside the audio room.