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Old 04-20-2013, 10:20 AM   #1
sfcjetjr
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Passive band pass filter?

Want to know if some one could build (4), passive band pass filters for a 2 ohm, 6.5" drivers, running 80hz to 1.25khz, after compensating for a 12 db drop off on each end? Who wants the job?

Joseph T.
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Old 04-20-2013, 12:20 PM   #2
Grande D
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Parts Express does. Call them.
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Old 04-20-2013, 12:37 PM   #3
ccaudio1
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narrow bandpass 80hz-1.25khz

Formulas for second order only, calculate for C1 first, then L2, C2, L1.

L1 = 1 / (39.472 x C1 x [F1 x F2]) x 1,000 = L1 in (mHy) Coil - L1 5.26835 Millihenries (mHy)

C1 = .707 / (Net Impedance x 6.283 x [F2 - F1]) x 1,000,000 = C1 in (fd) Capacitor - C1 48.08798 Microfarads (fd)

L2 = 1 / (C1 x [6.283 x (F2 - F1)]2) x 1,000 = L2 in (mHy) Coil - L 2 0.38482 Millihenries (mHy)

C2 = 1 / (39.472 x L2 x [F1 x F2]) x 1,000,000 = C2 in (fd) Capacitor - C2 658.34449 Microfarads (fd)
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Old 04-21-2013, 06:40 PM   #4
sfcjetjr
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Passive band pass filter?

How to make connections? I was presuming a simple set up like a choke and cap, or choke and resistor. What you show has 4 components. The amp I got to run the 4 6.5 subs in the door and back tray only has CO for 80 down or 80 and up. I was being cheap, but little thing really produces. Just want to separate the 80 and up from over lapping the mids. It sounds great now, but just the separation. I have the stock tweeters, and upgraded 3" mids running on stock amp #1. One 10" sub at true 200 watt amp set to 80 amp #2. Figured that out using volt meter and 80 hz track from cd. And the 4 kicker 6.5's running at a a true 90 watts at 80 and up on built in CO on amp #3. Just a cheap way of getting large gap in frequencies that stock amp has between stock mid basses and mid range speakers. Gap noted by another poster, of stock amp CO points. I love to tinker! And experiment on the cheap. Right now it will push a clear 135 db max. But still experimenting with gains and LLC's settings. Trying to be precise on settings using volt meter then ears. Had diving accident, ruptured ear drums, and the left does not perceive tones like right.




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Old 04-21-2013, 06:49 PM   #5
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Passive band pass filter?

http://www.pac-audio.com/crossover/crossover%20cs.pdf


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Old 04-21-2013, 10:49 PM   #6
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the info i provided is for 2nd order 12db narrow bandpass filter as you stated. see the PAC pdf info you provided.

so lets see> 10" sub 80hz down, (4) 6.5 midbass running 80hz up, mid and highs off factory amp.. the easier way is to get a 12db lowpass @ around 500-800hz hook it up to the midbass amp powering them.. but run that amp crossover 80hz high pass.. that should give you the cutoff piont you needed. see PAC PDF for 12db lowpass.

this will give you a cutoff frequency on the 6.5 midbass 80hz up and between 500-800hz down. i wouldnt run it any higher than 800 for midbass.

thats the cheapest way... i can see with what your working with... hope this helps
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Old 04-23-2013, 12:51 PM   #7
sfcjetjr
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Passive band pass filter?

Great thanks for info, will do this week and see how it goes. I'll let you know


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