20 Amp Dedicated line: 10 gauge vs 12 gauge wire

There is no issue running 10-gauge wire for a 20-amp circuit. I have a circuit run with hand-pulled solid-core 10-gauge and high-grade conduit that is 100' from breakout box to listening room with great results. I use Oyaide R1 cryo'ed outlets and have found like others on the thread that removing my power conditioner after the fact (Furman IT-Ref20i) actually resulted in even better sound. The comments on ground potential over multiple dedicated circuits as written above are also well-founded. One suggestion I would make is to move away from Romex; there are better sounding alternatives out there in terms of both stranded and solid core options that will cost you more but be more than worth it in the long run (pun intended)!

By all means, I'd be interested in alternatives to Romex.

Analysis Plus makes a 10-gauge extremely high-quality in-wall certified conduit, "Power Oval 10" that lists for $30/foot. I have great conduit already in-wall (10-gauge multi-9's, solid core, hand-pulled) as referenced above however I am getting ready to experiment with a length of this product....A friend is a Tara and Analysis Plus dealer; he made a 10 foot cord out of the Power Oval 10 recently with Wattgate plugs and it did great things for various components even when using this 10 foot section from an existing run of the mill wall outlet. I am wondering just how good it would be with Oyaide or high-grade Furutech/Wattgate plugs to extend my current circuit across the room and allow me to relocate my system leaving speakers and amp alone in the front. If you want more details, write me offline.