Hi HiFiThor, I don`t know if you resolved your remote amp/preamp setup as posted a little more than a month ago as I just stumbled across your post.. I had the same kind of situation in 1995.. What I tried first was to run 40 ft. custom made Monster Cable interconnects between the remote amp and preamp.. It worked but also had ground loop hum and switching noise from light/ceiling fan switches, ect. because of the preamp was plugged into one power circuit & and the power amp in another.. I tried to isolate with Cat 5 cable & baluns later on and also line level RCA to RCA isolators, but neither passed any signal because of the very low impedance output of the preamp was basically shorting out the galvanic isolation transformers of either type of method.. What I ended up doing was to run a small 16 ga. extension cord from the power amps 120 volt power source to the preamp and its low powered connected devices(tuner, CD player) so all connected audio gear was at, or nearly at the same ground potential, which greatly reduced the ground hum noise.. Anyway, FWIW. that worked well for me until I totally reworked the whole setup differently years later.. I don`t know of any other HiFi quality "safe" ground loop prevention/breaking methods, though others on this site might.. The" common ground power source" feed setup that I described above worked every time for me when I setup and ran PA`s for rock bands with all the power amps on stage and the mixer, eq`s, crossovers, & effects were out in the audience fifty or more feet away, even when there was a closer power outlet nearer to the sound board in some cases.. Just my .02 worth. Good luck with whatever method you end up using & enjoy the music Sir.. Regards, OKB