.....make no mistake, when I had strapped K2's hitting the 15's, I could explode a cockroach from three feet....but it didn't sound "natural"....the ohmage/impedance changed as a massive amount of 2 ohm bullets were fired at a 4 ohm target....sticking out as warmly as it did, gave the effect of muddyness....same thing happened on a strapped K2 hitting the center sub....I guess it boils down to what speakers ya' got, I don't know....I want only "natural" impedances from the front soundstage, and crispy honey poured all over the front soundstage by the surrounds....must hear to understand....will hear that again....filling the dual voice-coils of the 15's, will allow 1600 watts to affect the cone instead of 800, with the impedance not changing....it's a game of impedances, Gentlemen, imho....