The Batmobile 4th order! 2 18's!

What subs should we use for 4th order BP? We want a LOW tune around 25Hz-30Hz. Plenty of airspace available, 2 20"x20" square ports. 2 18's. Run off either one or two AP30001Ds.

 

that was the orignial plan, solox 18s

apx. 10 cu ft for the front (vented) chamber and apx. 20 cu ft for the rear (sealed) chamber. 2 10" ports.

 

Exodus Audio Maelstrom-X 18"

1) Speaker Parameters

Diameter: 18.00 (inches)
Qts: 0.37
Fs: 17.40 (Hz)
Vas: 11.05 (cubic feet)
= 312.90 (liters)
S: 0.70 (response curve - .4 thru .7)

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2) 4th Order Bandpass Cabinet Parameters

Lower 3db Rolloff: 20.00 Hz (F3 Provided by user)
High 3db Rolloff: 53.89 Hz (Calculated)

Sealed Box: 4.32 cubic feet
= 7458.70 cubic inches
= 122.24 liters

Ported Box: 2.96 cubic feet
= 5122.98 cubic inches
= 83.96 liters

Tuning Frequency: 32.83 Hz

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3a) If using a Single Port

User definable port size:

Port Diameter: 8.00 inches (203.20 mm)
Port Length: 36.47 inches (926.43 mm)

Suggested: (.3 X Speaker Diameter)

Port Diameter: 5.40 inches (137.16 mm)
Port Length: 15.33 inches (389.47 mm)