after researching and debating whether to get a colossus or a 2500d, i think the 2500d is a better amp. The colossus pulls alot of current and is very inefficient 200+ amps, and put out only 1500 rms at 2 ohms acoording to tcab's test. 2500d has been benched at 2600 rms at 1 ohm at 12 volts.