Donnie I agree that the labeling is not intuitive and that the manual is poorly written. But correct me if I'm wrong here but you're not certain one way or the other that if putting the subs in link mode disables the crossover or not. Well there is one way to tell that should be pretty obvious, just send it full bandwidth audio and you should know right away.

Obviously it's easy to sit here and logically think about it when not in the rush to get things done. But I suspect that the low pass on the cross over is probably just always engaged and that switch just turns on and off the high pass for the output port. Who knows I could be wrong. But if it's a speaker you're going to use all the time, as I mentioned above it wouldn't be all that hard to figure it out.

I get it you're just venting. But really what do we expect from some cheap crap loudspeaker. You don't always get what you paid for, but you often do. Better brands have better manuals and less cryptic labeling.