Most passive cabinets advise 2 octaves of overlap between drivers, but most passive crossovers are 6db or 12db octave. I've no idea of the slope on my Yamaha PB-1 crossover, but it does have separately adjustable crossover frequencies for HPF and LPF sections. The drivers I've been looking at for subs all roll off around 200 hz. The three midrange drivers I've been considering run between 1.5 and .7 octaves of overlap. The driver with the highest degree of overlap is the least desirable to me because it'd pretty much need a tweeter. I'd like a little more overlap, but how much do I really need with the PB-1? Does the ability to overlap the crossovers change any rules of thumb for this preamp?