Custom Jackplate wiring

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I have some 2 way PA speakers that I want to make a jack plate setup for. Right now the speaker is setup with a 1/4" jack for the woofer and a 1/4" jack for the tweeter (bi amp only). I want to be able to switch between bi amp and conventional internal crossover setup using a switch. When the circuit is in Parallel mode I want the two jacks to be Parallel. I’m not sure whether its okay to common the negatives in the circuit to save the hassle of switching them. Take a look at my diagram so far if its a “Big No No” to combine negatives I think it would be good to know before proceeding. The XO is the crossover in the image.

An externally hosted image should be here but it was not working when we last tested it.
 
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