Nice low sub-bass (below 60Hz) - put it in the trunk of my hatchback and I got a car sound system for below $300 that rocks and bumps.
I loved it so much I bought 2 eventually - 1 still is enough but I like electronic dance music so I wanted a rave in my car/backyard.
Now they come with updated firmware so no more messing around with updates.
Using with XEQ on my android phone to tweak the sound just the way I like it