Anyone have recomendations based on experience of a good Amp/dac combo unit to use with a pair of HD650's? I'm mainly trying to reduce cable clutter, and I think a unit that runs on batteries or recharges would be a great way to go. That would eliminate a power cable as well as rca cables...

I could really use some guidance on what my next step(s) should be in improving my listening setup. I’m still pretty new at this so some of the concepts are a little confusing. My goal is to just have a nice primarily headphone based listening system in the living room, but that could go...