i just recently swtiched out a P.A. 2400 watt max amp (it was at 2 ohm per channel) and his voltage drop hit 11.8 for a DC Audio 2.0k (at 1 ohm) and the voltage drop went up to 12.9 and the subs increases by 5 DB
that is from 14.4 starting and on some shitty subs in a shitty box until i have time to built him a new box for his 4 DC 8s
moral of the story is the good amps arent that much more money, are a thousand times more efficient (even at lower ohms), sound a million times better and are far easier on your equipment.