Hi,
No, the EPZero is a passive subwoofer driven by the Audiobyte amplifier. Deep bass requires large amounts of amplifier power compared to the frequency range of the Audiobytes, so it's possible that you may have been exceeding the output limits of the Audiobyte amplifier.
How large a room are you using them in and how far back are you sitting? The system was designed for desktop use and smallish office, bedroom and den-sized spaces.
The EPZero subwoofer is very linear. It doesn't add a lot of artificial subwoofer "thump" or "boom" as many small powered subwoofers typically do to substitute for smooth linear bass.
Regards,
