Hey guys I'm kind of new to home theater audio. I currently have a paradigm set of speakers Monitor7 v2 front floor speakers Adp170 rears And a ps1000 v3 sub that I need to reform the surround. I currently have an onkyo receiver that is on its way out (loses audio periodically) seems to stay on if I put a fan over it. I found a set of polk audio rti12 floor speakers for a reasonable price that I'm interested in upgrading to, and I also already have an adcom gfa-555ii amp to power them. So here is where I'm a little lost. I need a preamp to power the gfa-555ii, which is a 2ch amp. I would run the polk rti12's off of it. But I would need a preamp, with hdmi inputs as well as Bluetooth for music. And then a way to run my 2 rear speakers as well. I'd prefer not to spend a fortune on just a preamp. Any suggestions on a budget new or used one that fits the bill?