Im not sure I remember those amps that had that option. Did S.Stream have something such as that? Those SIP cards or? Kicker ZR Series?.Way back, late 80's or early 90's, there was an amp that you could add sections to for more power. I believe it was A/D/S. Do any of you guys remember this amp?
Also, I just noticed that Harmon Kardon sells aftermarket car/boat audio. Now I'm really curious about how they sound.