Not really, an amp is an amp, but normally a car stereo amp is 2 Channels (or more) and some of the 1 Ch amps are espesially made for subs, sometime they have built in filters that removes all but the lower frequencys. Thay can be used for regular speakers in mono also, if you bypass the filter section or set it so it sounds good, like your'e doing. I have a 5 Channel amp waiting to go in my Challenger, but no room for rear speakers
. (Convertible)