The EP500 is definitely a powered sub. It has a 500W digital amplifier built in and plugs into an AC outlet (with a big hefty power cord ). I haven't heard the Earthquake line, hopefully someone else who has can jump in re: comparison.

Last edited by bridgman; 02/02/06 07:52 AM.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8