There are some relay based preamps that won't work with isolated ground outlets. The Pass Labs Aleph P, I have, is is one.
I was thinking that "isolated ground" simply meant that the ground conductor of the outlet was isolated from all other conductive componants in the outlet - preventing ground to the junction box, conduit, etc. If this is not correct, please let me know. Or if it is correct, and still applies to what you just said, then I guess I need to research this further (or hope it doesn't apply to any of my componants).
I'm installing a dedicated line, and my intention is to ground the conduit at the breaker box end, but be sure that it does not get grounded at the outlet end. The advice I got was to do it this way to prevent negating the shielding effect of the conduit.
The 8300 is available in both isolated or regular ground configuration.
Thanks
Don