I take that back about the ED 9.1 having an equal power supply to the Sundown SAZ-1500D. It's not true, it uses the same count and same mosfets on the power supply, but only has one little weak torroidial transformer, whereas the Sundown SAZ-1500D has 2 large transformers, capable of much more current handling (more like what the 8 mosfets are rated for) capacity. So the ED 9.1 has beefy mosfets on the power supply, but not the transformer to back up those mosfets. Hands down Sundown SAZ-1500D would be the choice between these two, it's obvious and I don't know why anyone would have compared a ED 9.1 to a SAZ-1500D in the first place, I am confused. 1200 watt amp compared to 1500 (@12V mind you) amp. The ED is probably rated at 1200 watts at 14.4 volts. The SAZ-1500D will do about 1800 at 14.4V if I recall correctly.