that unit was seen more in prof. studios where they used DBX, and had it on 16/24 track machines. That unit was not intended for home use. You see alot of other stuff in that style frame...from that era. However, DBX did not really do well as Dolby seemed to fair better as noise reduction when noise reduction was the big thing in the studios....kinda prior to decent digital. The stereo 150 units where more popular for home use...or even the little 4 channel units. worth?....not too much, unless someone is looking for one.