Any help appreciated

I just purchased a used unit and have a separate pre-amp and ground for my record player. plugged it in and it just sounds bad.. should I ground all the way to the unit? Or can i continue to use my tc760LC phono pre-amp which i like because it has volume control. I rebooked up my old adcom and it sounds great? I tried cd and vcr input also and they didn't sound right either…

2nd issue, can't get the rears to turn on.. Although they are working when i do the audyssey mic, they don't make noise otherwise? can't find the rear on off option in the menu? its just a bit confusing..

3 issue: Audyssey mic says it fails setup because Its not sensing the side rears, …. I don't have side rears, just 5.1 so I want it to just move on.. but it won't

Thank you for your time

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