I've had Apogee Duetta Sigs for over 25 years and I still love them, however, they really don't go much below 50 Hz. So quite awhile ago I added 2 Paradigm Reference 15" subs. I'm getting chest thumping base whenever I want it.
As suggested by others, you might try that befoe changing amps or speakers.
As suggested by others, you might try that befoe changing amps or speakers.