Thanks for the replies. I was skeptical about driving these with my onix sp3 but I've been pretty pleased with the combination. Definitely more substantial bass with a solid state feeding them (i've tried an sae 2200, amber model 70 and b+k st202) but the onix does just fine. I'll check the impedance and the terminals tonight but i've been hooking them up to the 4ohm taps on the onix
