Box Parameters Audiobahn Box Specifications All ports listed are circle ports unless otherwise stated. Surface area of a circle port = (3.14) X (radius) (squared) Remember to build your box to the total volume, not just air space, as total volume includes all displacement. Model # AW831T AW1051T AW1251T AW1571T Ported Air Space (Cu. Ft.) Port Size (Inches) Port Vel. (%) -3dB (Hz) Tune Freq. (Hz) Sub Disp. (Cu. Ft.) Port Disp.(Cu. Ft.) Total Vol. (Cu. Ft.) 0.7 2 x 6.1 12.77 36 40 0.08 0.009 0.75 0.65 2 x 6.5 33.45 40 40 0.1 0.01 0.75 1.3 3 x 6.75 27.15 44 40 0.15 0.024 1.5 1.7 3x7 28.15 40 35 0.21 0.025 2 Everyday Bass Performer Ported Air Space (Cu. Ft.) Port Size (Inches) Port Vel. (%) -3dB (Hz) Tune Freq. (Hz) Sub Disp. (Cu. Ft.) Port Disp.(Cu. Ft.) Total Vol. (Cu. Ft.) 1.15 3x9 6.26 33 38 0.08 0.033 1.25 1.4 3 x 6.75 16.75 31 39 0.1 0.024 1.5 2.3 4x9 14.18 35 35 0.15 0.06 2.5 2.65 4 x 7.5 16.74 35 35 0.21 0.048 3 Ultimate SPL Bass Box (not designed for competition use) Ported Air Space (Cu. Ft.) Port Size (Inches) Port Vel. (%) -3dB (Hz) Tune Freq. (Hz) Sub Disp. (Cu. Ft.) Port Disp.(Cu. Ft.) Total Vol. (Cu. Ft.) 1.9 3 x 5.75 5.81 30 35 0.08 0.02 2 2.4 4 x 6.8 9.96 30 39 0.1 0.04 2.5 3.15 (2) 4 x 12 7.56 30 36 0.15 0.166 3.5 3.55 (2) 4 x 11.25 8.69 31.5 35 0.21 0.152 4 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. An EBP of less then 45 is SUGGESTED for only a sealed box and greater then 65 for a ported box. EBP 96 44 42 51 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. Model # AW831T 0.25 1 84.5 AW1051T 0.75 2 83.8 AW1251T 1 2 88 AW1571T 1.25 3.5 89.2 Sealed Minimum (Cu. Ft.) Maximum (Cu. Ft.) SPL (dB) All sealed boxes already include the displacment for the subwoofer. NR = (Not Recommended) 8 ...