Wow, what a great thread, I really like (and agree with) Elizabeth's rules for living, and who'd believe someone would actually quote Captain Beefheart. Way to go, Pehare. This thread has really brought out the "inner poet" in you two.
Regarding ground loops, consider trying Jensen input transformers just ahead of your amps. Totally solved my problem going from a single-ended preamp to my balanced only amps. Went from all sorts of noise (almost sold the Clayton's) to dead-nuts quiet. Go to their website and give them a call - very helpful folks and the stuff is not that expensive. BTW, since you have "multiple amps" be aware that they sell single line models of the transformers that may be logistically easier for you than the twin versions shown on the website. They will make them as you need, rca-rca, xlr-xlr, rca to xlr, and xlr to rca.
Regarding ground loops, consider trying Jensen input transformers just ahead of your amps. Totally solved my problem going from a single-ended preamp to my balanced only amps. Went from all sorts of noise (almost sold the Clayton's) to dead-nuts quiet. Go to their website and give them a call - very helpful folks and the stuff is not that expensive. BTW, since you have "multiple amps" be aware that they sell single line models of the transformers that may be logistically easier for you than the twin versions shown on the website. They will make them as you need, rca-rca, xlr-xlr, rca to xlr, and xlr to rca.