My apologies if this has already been asked and answered ( I looked but didn't find ). I have a new 1000 W solid state amplifier ( 10A 240V or 20A 120V ). Is there any REAL advantage to having a 240V dedicated line over a 120V dedicated line? Seems to me that the real issue is having a "dedicated" line. My amplifier manual says 240V is preferred for "stability" ... but wouldn't ANY dedicated line do that? From earlier experience ( 1960s ) I know that using such an amplifier on a non-dedicated ( 15A ) line will cause problems ( light-dimming, etc. ) but I wouldn't expect any of that with a dedicated ( 20A ) line. My ( non-ham ) electrician says I only have room in the breaker for adding one 120V dedicated line ( and no room for a 240V breaker ). The run would be 100 feet or less. Romex 12-2 wire with ground. Any advice or insights would be appreciated.