This is one of the handful of subs that I believe is truly made for music and not for chest thumping home theater effects. The bass is very smooth sounding which never muddies the high frequencies. Infact, it accentuates the highs during my listening experiences with this sub. Since this is a downward firing sub, you need a solid foundation for the sub to perform optimally. IF you living in an apartment or something where the floor is sort of hollow, then you might get reduction in volume.
Velodyne ULD-15 II sub performance
The ULD -15 sub only allows adjustment of the "subwoofer level" volume control. When listening to music at low volumes, the sub is invisible unless I turn the sub's amp to 80%. Is this typical of this sub woofer? I thought it is a 400 watt amp? Shouldn't it put out more sound and lower volume controls?