110 (or 120) vs 220

My reason for doing this is that my tube amp is rated at 35 watts / channel. I'm buying new speakers after having my Paradigm 5se's for over two decades.

I naively thought if I doubled the voltage I could ~double my available power (~quadruple at 4 ohms?) and that would vastly increase the pool of speakers I could choose from (e.g., Totem, Magnapan).

Never ran across no 2 pole breakers feeding audio equip in NEC.
Only advantage would be 1/2 current so you could use small gauge wire.

Also Audio equipment doesn't draw that much current to warrant 220v