Brain Teaser

Hi Eric, while this is not an extremely difficult problem to solve if you remember that impedance is relative to frequency, it is likely to give you undesireable results. If you do intend to run the multiple woofers you described you're going to want better control than you'll get with passive crossovers and L-pads. I'd suggest using more than one amplifier and an electronic crossover, but here's the simpliest solution to your brain teaser:

Connecting all speakers on a single mono output using 6dB per octave passive crossovers wiring them as you described above...

Bandpass filter for Bazooka (80Hz - 110Hz, 4 ohms): 5.8 mHy coil and 497 µfd capacitor

You can attempt to overlap frequencies with the Rockfords and the Bazooka, but you're likely to get an unwanted peak between 70 and 90Hz. To do so, instead of using 497 µfd capacitor on the Bazooka use a 566 µfd capacitor, and on the Rockfords instead of using a 3.98 mHy coil, use a 3.5 mHy coil. This will give you a nominal impedance of 1 ohm 50Hz and down, 2 ohms 50Hz to 70Hz, 1.33 ohms 70Hz to 90Hz, and 4 ohms 90 to 110Hz.

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Errr.... if you want to run the Lightning Audio subs at 55Hz and down and not 50Hz and down, use a 2.8 mHy coil instead of the 3.18 mHy coil.

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thank you very much for your help!  i am going to get the caps and coils today.  i'll let you know how it turns out.  thanks again,

Hi Eric, you're welcome, glad we could help.

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