Alright i have a ppi 10 in sub and alpine type x 5 1/4 components. My problem is that i have no was to test for phase. Does anyone know how to test without an spl meter? Its the phase between the mids and highs. The other thing i was wondering is my x over is set at about 80 hz and is selectable to 120, 80 and 60 hz. Whats the best way to choose the best one i listen but then i find myself changing it and liking it for a while and then changing it again. What do you listen for to judge a crossover point? Thanks for any help.