I plan to use a pair of bookshelves coupled with a sealed sub for 2ch crossed at around 60-80hz. The sub is a passive one, so I plan on using an outboard amp, a bridged ATI 1502. The amp doesn't have any volume control or high pass XO as with a typical sub plate amp. Thus, I need some sort of high pass and low pass crossover to use the sub in conjunction with the bookshelves. I was looking into the NHT X2 and the Paradigm X30 as well as the Velodyne SMS-1. I am slightly hesitant to adding more things to the signal chain, but it seems like the only way. Each unit has there pros and cons, especially with the SMS-1's very spartan high-pass crossover (@80hz 6db/slope). I had also looked into the mini-dsp, looks slightly complicated but will this be fruitful for my setup?
Thus my question: is there a better unit for my needs? or should I just scrap this and buy a sub amp and using the high and low pass XO's in those.