Im trying to figure out how exactly the crossover in my 18" Peavey cab works. It has a full range input, low input biamp, and 2 highpass outputs. Am i correct in thinking the highpass outputs send the high signal to another cab? I plugged a 4x12 guitar cab into the highpass out, and my amp into low input biamp... The fullrange sound sent to the 4x12. I then plugged the amp into the full range input, and it only sends signal to the 18 andnot the high cab. Can anyone explain if im understanding this wrong or there an issue with the xover?