PPI!!!!!!!!!!!! GET THE PPI!!!!!!!!!! it has the better of the 2 crossovers and i also think the PPI sounds better. when i say it has the better crossover, the PPI crossover has little clicks in it. in the manual it tells you what crossover point each of these clicks represents. this way you know exactly what the X-over is set at. unlike most other crossovers where you just kinda have to set it by ear. PPI PC anything is good stuff. PPI PCX on the other hand, i would have to not like as much.
J