Originally posted by dnewma04:
It looks like a bandpass using both woofers would need a 1 cu. ft. rear chamber, and a .625 cu. ft. front chamber. The front chamber would need a port 3" round by 6.4" long. This would be the ideal box, but you could get away with a .75 cu ft rear chamber fully stuffed. This set up should give you ~5-6db more output from 50-85 hz, than your infinite baffle setup. It rolls off pretty sharply under 50 hz. With cabin gain, you should have usable response into the mid to low 30 hz range.
Hey Dave,
I ran the WinISD program and input my sub's parameters along with a dual woofer 4th order bandpass box. Here's what it came up with:
Front chamber: 1.18 cubic feet
Rear chamber: 1.90 cubic feet
port diameter: 4.02"
port length: 5"
Am I doing something wrong with the program or something?
It's showing a flat response from 45Hz to 75Hz.
Here are the sub's specs per the operating instructions:
FS: 36.8Hz
Qms: 3.04
Qes: 0.55
Qts: 0.44
Vas: 44L (1.5 ft^3)
EBP: 66
Revc (2 each @) Ohms: 3.6
SPL: 88.3dB
Xmax (mm) linear peak-peak: 14
Levc(mH): 0.72
Power handling: 200W continuous
Thanks for any light you can shed on this.
-Colin
