I dont know if my lingo is even correct, but I am looking to biamp my b&w cdm-1se bookshelf speakers. I need something to set up a band pass filter from 58Hz-4kHz and then a high pass filter at 4kHz for the tweeter. I may or may not want the flexibity to tri-amp in the future (likely determined by cost). Any other options to do this? Im familiar with the passive Harrison Labs filters (RCA style) but wanted to explore other options. Thanks!