Eleven Rack white noise issue

[Marshall199]

I just picked up an eleven rack recently. I hooked it up to my old event ps 5's with the xlr mains (15ft) and played.. Really like the units sound, but the old white noise hiss is there. Unplugged from CPU, turned off monitors and unplugged from 11r.. Tried headphone jack and guit with a brand new monster cable, the "tape hiss" is still there. Unplugged guitar, bypassed all amps fx etc, still hissy, changed internal clock to 48, tried main volume 10 everything else, amp out, amp level at lowest setting. Still there. Tried my VRM unit thru the CPU with headphones to make sure I'm not just imagining the noise.. Headphone out in eleven rack is just noisy... Don't think I have a faulty unit judging by prev posts.. Any help is greatly appreciated.

Marshall