Model # ALUM8P ALUM10Q ALUM12Q ALUM15Q
Air Space (Cu. Ft.) 0.65 0.6 1.3 1.6
Port Size (Inches) 2 x 6.25 2 x 6.75 3 x 7.25 4 x 10
Port Vel. (%) 16.54 38.34 27.49 28.02
Tune Freq. (Hz) 40 40 39 40
Sub Disp. (Cu. Ft.) 0.1 0.15 0.18 0.25
Port Disp.(Cu. Ft.) 0.09 0.011 0.026 0.06
TotalVol.(Cu.Ft.) 0.75 0.75 1.5 2
Air Space (Cu. Ft.) 1.15 1.35 2.3 2.65
Port Size (Inches) 3 x 9 3 x 7.5 4 x 7.75 (2) 3 x 7.25
Port Vel. (%) 8.09 18.72 15.53 23.25
Tune Freq. (Hz) 38 38 37 37
Sub Disp. (Cu. Ft.) 0.1 0.15 0.18 0.25
Port Disp.(Cu. Ft.) 0.033 0.027 0.051 0.053
TotalVol.(Cu.Ft.) 1.25 1.5 2.5 3
Air Space (Cu. Ft.) 1.9 2.35 3.25 3.5
Port Size (Inches) 4 x 10.75 4 x 7.25 (2) 4 x 11.25 (2) 4 x 10.5
Port Vel. (%) 4.58 11.14 8.06 13.11
Tune Freq. (Hz) 36 38 37 36
Sub Disp. (Cu. Ft.) 0.1 0.15 0.18 0.25
Port Disp.(Cu. Ft.) 0.073 0.045 0.152 0.14
TotalVol.(Cu.Ft.) 2 2.5 3.5 4
Model # ALUM8P ALUM10Q ALUM12Q ALUM15Q
Minimum (Cu. Ft.) 0.25 0.5 0.5 1.5
Maximum (Cu. Ft.) 0.5 1.25 2 3
SPL (dB) 81.4 82.5 85.2 86.8
All sealed boxes already include the displacement for the subwoofer. NR = (Not Recommended)
Audiobahn Box Specifications
Remember to build your box to the total volume, not just air space, as total volume includes all displacement.
An EBP of less then 45 is SUGGESTED for only a sealed box and greater then 65 for a ported box.
The larger a sealed box is, the lower the sub will play, but the less power it will handle. The smaller a sealed box is, the higher the
frequency the sub will play, and the more power it will handle.
All ports listed are circle ports unless otherwise stated. Surface area of a circle port = (3.14) X (radius) (squared)
Ultimate SPL Bass Box
(Not Designed for Competition)
A port velocity of 20% or under is good for everday use and 5% or under for SPL competition . Port velocity translates to port noise, so
the lower the number, the less port noise you will incur.
8
10
