I ran em on 16", 17" and 18" and the 18"s bar none make her fly best,,,, amp draws with an epic hovering was 78, pushed it to 130 amps, has 400 amp buss.... 20 amp of 20c so 400 amp service all across the board, prc6 times 2 are probably my biggest limiter. Haven't felt much in the way of heat...