Soundhound,

Your configuration is very interesting. I have ribbon panel mids good from 10KHz to 166 Hz. (Super) tweeter goes to 25K. I have left the passive x-over for this alone. I cross my woofers at 200 Hz and sub at 50Hz -- all 4th order as well.

What size are your midwoofers. Mine are 10" that are good to 600Hz. The tricky stituation is that my two woofers (originally designed to do midbass as well as bass) have different range even through they receive the same signal. The bass woofer rolls off at 150Hz.

I want to raise the crossover frequency for the woofers from 200 to ~450Hz to get a little more punch in the upper bass region, but I may have to change the lower driver that rolls off at 150 Hz.

I really like my midrange ribbons -- they are really good with vocal reproduction. I am just greedy at this point and get that right "coloration" of deep baritone and bass sound as well. I want that note ...CIL... as intoned by Sparafucile in introducing himself to Rigoletto to be as deep and forboding as the bass can render it.

Thanks for all the advise so far.