Any Differences 120v vs 220v dedicated circuit on Krell EVO Equipment

[deependx]

I have Evo's mono's as my amplifier.

Questions:
1) Since Krell requires a lot of power, is there any differences on performance using a 120V dedicated circuit vs 220v dedicated circuit (of course the Krell's would need to be converted). Most of the 3 prong conductors are rated as 125v 15A % 250V 10A. Moreover, the most IEC 20AMP are rated as 125v 20A vs 250V 16A. If there any a differences, any suggestions?

2) Schuko connectors are normally used on circuits with 230 V, 50 Hz, for currents up to 16 A. So if i move my equipment to Countries that uses 200-240V, should i re-terminate all plugs to schuko not because of the plug differences but sonic improvements (if any)?