Simple active subsonic crossover??

[TheBaronGroog]

Hi all,

I need a "simple" 24dB/Oct crossover fixed at 20Hz for a ML-TQWT I'm building as part of an active system. I've seen the FMOD inline units and they are what I am after but with a steeper slope. Anyone know how to make one?

[chad]

http://www.sound.westhost.com/projects.htm

[BigAl205]

http://ccs.exl.info/calc_cr.html

You would input the speaker impedance and crossover frequency.

Looks like you would want a high pass filter with Capacitors of 2110µF and 4220µF...and coils of 40mH and 180.04mH (assuming they are 4Ω drivers)

[chad]

fo 20 cycles he will have to go active.. that's a bigass cap and a coil like a coffee can.

[jowens500]

I have some Hooker Audio ones at the shop. I have no idea what slope they are though.

[chad]

I guess a better question is... Why? What do you listen to that has a substantial amount of 20Hz and lower content?