I have a Morel CAW 538 and CAT 378 I am trying to design into a 2-way bookshelf in a 7L bass-reflex enclosure tuned to around 42Hz. I know if I flush mount the tweeter and surface mount the woofer I will have near perfect time alignment. It is coming down to the crossover and I wanted to bounce a few ideas off the forum because I see two strategies.
First strategy is to do a simple 2nd Order LR Filter at 2500Hz with an L-Pad on the tweeter and call it a day.
Second strategy is a little more ambitious, but I think may yield a better result and take advantage of the excellent FR of these drivers. I think I can get away with a Dynaco A25-esque design. The woofer has a nice rolloff starting around 4000Hz with a small peak around 8000Hz (cone breakup?). My idea would be to address this with a 1st-order filter around 5-6kHz to make sure it is far enough down it will be inaudible with a simple 0.5mH coil (impedance is about 13 ohm at this frequency). Then use a 1st order on the tweeter around 7000Hz. I say 7000Hz and not 4000Hz because the tweeter has a subtle rise (going backwards towards the crossover point) from 6000Hz-3000Hz that could be nullified by the gentle slope of a 1st order crossover. I would likely use 2.2uF cap. Am I crazy or would something like this work and give better transients?
Background: I have been building DIY speakers for a few years now. I know my way around a schematic, am handy with a soldering iron, and now feel ready to cut my teeth with a design of my own.
First strategy is to do a simple 2nd Order LR Filter at 2500Hz with an L-Pad on the tweeter and call it a day.
Second strategy is a little more ambitious, but I think may yield a better result and take advantage of the excellent FR of these drivers. I think I can get away with a Dynaco A25-esque design. The woofer has a nice rolloff starting around 4000Hz with a small peak around 8000Hz (cone breakup?). My idea would be to address this with a 1st-order filter around 5-6kHz to make sure it is far enough down it will be inaudible with a simple 0.5mH coil (impedance is about 13 ohm at this frequency). Then use a 1st order on the tweeter around 7000Hz. I say 7000Hz and not 4000Hz because the tweeter has a subtle rise (going backwards towards the crossover point) from 6000Hz-3000Hz that could be nullified by the gentle slope of a 1st order crossover. I would likely use 2.2uF cap. Am I crazy or would something like this work and give better transients?
Background: I have been building DIY speakers for a few years now. I know my way around a schematic, am handy with a soldering iron, and now feel ready to cut my teeth with a design of my own.