Yes you may be underamping. But your main problem is likely speaker and seating placement/positioning, and their relation! If your speakers or seats are not coupling well in parts of frequency spectrum, you WILL get a weak bass response! Also, from a "height perspective", if your ceiling is 8', the standard Sonus stands at 30+ inches are too high in my experience! The speakers do better aimed up slightly on 24-26" stands at best!
Still, you need to put the speakers where you sit,play music, and move around near the room, with your head down where the speakers go!. Then you move around till the bass sounds right!...repeat for each speaker.This is the easy quick way to "earball" the response for each speaker. If you don't get your seats and speakers set up where they couple best for "flat frequencey response", you'll get poor overall response in the bass. You can also measure when you're done with test tones and a sound level meter to make sure. IF it measures reasonably flat from the bottom of the bass to the upper bass, you'll have dynamic, full, fast, accurate sounding bass!
Learn to set up speakers in a room, and you'll be rewarded. Also, if a large large room, don't expect deep room filling bass, as the woofers can't fill the room. Good luck
Still, you need to put the speakers where you sit,play music, and move around near the room, with your head down where the speakers go!. Then you move around till the bass sounds right!...repeat for each speaker.This is the easy quick way to "earball" the response for each speaker. If you don't get your seats and speakers set up where they couple best for "flat frequencey response", you'll get poor overall response in the bass. You can also measure when you're done with test tones and a sound level meter to make sure. IF it measures reasonably flat from the bottom of the bass to the upper bass, you'll have dynamic, full, fast, accurate sounding bass!
Learn to set up speakers in a room, and you'll be rewarded. Also, if a large large room, don't expect deep room filling bass, as the woofers can't fill the room. Good luck