Question at bottom.

Channel 1 on my 223xl dropped the lows, like engaging its Butterworth low cut. But it did it all on it's own and the low cut switch operates normally. When I pushed on the faceplate on ch1 side, the lows came back, until I let off. So odd.

I have a set of Grund Audio dual 15" with horn and internal crossover that I want to re-wire to biamp with my external crossover. Can I just run new wires from the speakers straight to jacks or do I need any signal modification? Also should I wire the 15's parallel or series? The whole system will be run stereo 3way with a separate set of 18" cabs.