The cross over is for telling the system where to send low frequencies. If you have a sub then anything below 50Hz goes to the sub. If you have no sub with full range fronts then if you set the crossover for the rears it will send low frequencies to the front.

Seperately there is a bass limiter for each speaker to protect the speaker and uses the calculator to determine it's limit.

The only effect distance would have is a delay. I'd just measure it and set it right.

Sounds like you have a node in the room. Very common. One reason subs are common is that you can move them to try to reduce problems like this.

Anyone please correct me if I'm off here.

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