Sealed box instead of ported design. Strong amplifier, can reach down to 22hz.
very musical, RABOS makes it easy to integrate into your systm, but it takes time.

Heavy!!. must be moved around in room to find best location. RABOS system take a lot of time to set up.

Good sub for the money, it is a very musical sub, that excelles well with music and movies, I purchased two of these for my ht room and could not be happier, on movies like dark night and iron man the room is perssurized quite well. The sub is very heavy and must be moved arround at first to find the best location which is a pain. the R.A.B.O.S system works very well but takes a long time to set up. good value.