My JBL GTR-1001 mono amp crossover is 32hz - 320hz and no option to go full pass. I believe it is also -12db slope. If I wanted to use the low pass crossover on my Pioneer also what should I set that to and what should the amp be set to, matched at 80hz or go to 320hz? I heard not to use multiple crossovers but combining the slopes may be better I don't know. What do you think?