Peter,
Thank you for all the help as its been greatly useful for beginners as the thread is still active throughout the past 8 years. I am attempting to build my first PA system having just about completed my first TH18 build based off of one of Brian Steele's sheets and wanted to find a suitable mid high top to pair with it. Trying to get as much value/performance as possible, I have DCX2496 for active crossover which it seems the IIR filters will be able to handle for the PM60, and for the amps a NX6000d and the FP14000 clone I plan to purchase.
As I've gone through this and the pm90 thread, I still have some (rudimentary) questions regarding the wiring, if you could please correct me on these. The three crossover points needed will be at around 120hz for the subs, around 650hz for the BMS horn, and around 6.3khz for the BMS or other compression driver used between its two drivers.
-With the passive crossover, does this mean I would have the mid (2 12" in parallel) on one output NLX connector and the high (BMS) on another output NLX connector and crossover the channels within the DCX2496?
-Am I correct in saying that if the BMS passive crossover is not used, it then requires an additional output connector and amp channel to crossover at 6.3khz for the VHF range?
-How is it possible to filter out all these frequencies on a single NL4 or NL8 connector even though they are on separate poles? It seems that on the DCX2496 the crossover point is between each output channel, do other DSP units have a different method to crossover within the poles?
From the DCX2496 manual
Thank you again for any reply and help; I work in a completely different area of Electrical Engineering (and admittedly did not have great grades in DSP), but this has been lots of fun 
Derick
