Velodyne

Subwoofers

Velodyne SPL-1000i

Forceful low frequencies at any volume level, but hamstrung rather by vague timing

Subwoofers

Velodyne SPL-1500R

The SPL-1500R isn’t small or cheap, but it is very good

Subwoofers

Velodyne DD-18

There’s more to this beast than blunt force