Hello. I haven't tried this particular configuration yet. So I have a Crown Drivercore 1500. It bridges into 4 ohms. I plan on daisy chaining 2 - 8 ohm passive 15" PA cabs for a 4 ohm load. I'm ok so far. But we just purchased 2 powered subs. The connection instructions are to run speaker cable to the sub, then out of the sub to the passive main. Each side if running stereo of course. So going bridged, I plan to run the 1 bridged cable like this: Amp>Sub in>Sub Out>Speaker Main In>Speaker Out>Sub#2 In>Sub#2 Out>Main Speaker #2 In. My question is will the Crown ignore the ohms (unknown) of the powered subs so that it is seeing a 4 ohm load? I don't want to blow my amp or the drummers PA. My guitarist has an idea of utilizing the sub outs on the Mackie board, but not sure if we'll go there this gig...maybe next time. Thank You!