Need help with a 4th order bandpass box
First attempt at a Bandpass Box.
I just built a 4th order BP box for a Panasonic 10" woofer, and it sounds terrible. Not "bandpass" bad, just designed wrong. The frequency response is WAY off.
Here is what I have:
Panasonic 10" t/s
Vas: 42 L
Fs: 30.0 Hz
I input that into the calculator on carstereo.com and came up with:
Volume front = .397 ft^3
Volume rear = .533 ft^3
Fb (front side) = 58.3 Hz
Frequency response ~ 35-90 Hz
Added sub displacement and port displacement to the front and rear volumes and built the box.
Due to the small area, I could only get a 3" port into the enclosure. Maybe that is too small? Calculated a 3" x 12" long port.
Anybody tell me what to do different?????
2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz.
1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz.
no system right now. . .
Next system: (2) Massive Nx4 amps, (1) Massive N4 amp, (1) Audiocontrol EQL and 2XS
(12) AA Carbon Fiber 7" mids, (8) Morel MDT-12 tweeters, (1) 15" UFO BTL
REFS: iceteebone,jntar,djman37,TeamPSI,James Bang,96MaxGLE,photocrazy8,xclusiv3,DBDesignsElite, Amalan