I recently bought a emotiva umc 1, a sub12 and a xp 5 amp, I was having trouble with the auto mode on the sub, emotiva sent me a replacement sub, but it had the same problem, after some research on the umc I found that it had bass managment issues. also, it did not sound any better sonicly then the receiver that it replaced, so I took a loss and sold it, I bought a used parasound c2 prepro and after hooking it up, I found a huge jump in quality of sound in both music and ht, I had planned on buying the new prepro that emotiva has comming out, but not anymore, I hooked all my video sources up direct to my tv and will forgo hdmi and stay with the parasound. the sub auto feature works with the parasound. on a positive note, emotiva xp 5 5 channel amp is excellent, and the sub sounds great through the c2 .