They are very tightly regulated, from 11v -16v there's but one watt of difference. THD is. 01%, S/N is >105dB, 250w x 2 @ 4 ohms, 500 x was @ 2 ohms, or 1000 x 1 @ 4 ohms. It'll do about 1500 x 1 @ 2 ohms but you better have a very stout electrical system and a fan on the amp is a must per...