Decent sound, fits in a small space.

Doesn't create the sound pressure that many like.

I bought this sub to install in my daughter's 92 Celica convertible. Since it is a convertible, it can only except 4" speakers and bass is an issue, so is space. This is mounted in the trunk where there is very little room and bass gets cut down significantly when the top is down. My daughter likes her music balanced, not high sound pressure. She is a musician and appreciates the entire spectrum of sound.
I was worried if this sub would have enough power to give at least decent performance. Once I turned it on, my fears were gone! This sub kicks. Not as intense as my son's 12" sub setup, but we had to turn down the sub amp as well as the bass output on the headunit in order to balance the system. She is running an Eclipse headunit, 4 -4" infinity reference speakers and this sub. It's overall sound is better than my Alpine CDA-9853 with a 300w. Alpine V-12 4 channel amp pushing 4 Alpine R 6.5" speakers. I am now buying one of these so my stereo will sound as good.