......do one of those graphs showing frequency response of my sub? I am borrowing an SPL meter and an AVIA set up disc and not only do i want to set up all of my speakers correctly but also produce a graph showing the frequency/room response of my REL Q200e sub. I assume that i will have to turn off all of my speakers apart from the sub and then do a frequency sweep and record the numbers. Is it then a case of sticking the information into Excel and producing a graph? I am assuming that this will also help me ascertain the crossover point between my sub and mains to get the very best out of my setup?