View Full Version : Need help with box.

04-02-2005, 02:10 PM
I have two Audiobahn 1206t's and I need to build a box for my civic. I've tried using George's tutorial but didn't make it very far... (I don't know what I should tune the box to, etc.) I currently only have the 12's on 500 RMS each. I'm not sure if I should go sealed or ported considering the 12's handle 1100 RMS a piece. My max dimensions for a box are 15hX28wX34d. The Audiobahn specs are listed below, if anyone could help me get started I'd greatly appreciate it.

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 # AW1206T
Space Saver Bass Design
Ported Air Space (Cu. Ft.) 1.3
Port Size (Inches) 3 x 6.75
Port Vel. (%) 34.65
-3dB (Hz) 35
Tune Freq. (Hz) 40
Sub Disp. (Cu. Ft.) 0.25
Port Disp.(Cu. Ft.) 0.024
Total Vol. (Cu. Ft.) 1.5
Everyday Bass Performer
Ported Air Space (Cu. Ft.) 2.3
Port Size (Inches) 4 x 7.25
Port Vel. (%) 19.6
-3dB (Hz) 32.5
Tune Freq. (Hz) 38
Sub Disp. (Cu. Ft.) 0.25
Port Disp.(Cu. Ft.) 0.046
Total Vol. (Cu. Ft.) 2.5
Ultimate SPL Bass Box (Not Designed for Competition)
Ported Air Space (Cu. Ft.) 3.2
Port Size (Inches) (2) 4 x 12
Port Vel. (%) 9.65
-3dB (Hz) 30
Tune Freq. (Hz) 36
Sub Disp. (Cu. Ft.) 0.25
Port Disp.(Cu. Ft.) 0.165
Total Vol. (Cu. Ft.) 3.5
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 80
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 #1206T
Sealed Minimum (Cu. Ft.) 0.5
Maximum (Cu. Ft.) 1.25
SPL (dB) 84.9
All sealed boxes already include the displacement for the subwoofer. NR = (Not Recommended)
Revised June 2, 2003

04-02-2005, 03:37 PM
assuming you want them to be loud as possible, and because they're greatly underpowered, i'd go ported, you have the space for it.

04-03-2005, 04:33 PM
what would be a good tuning freq. for these subs?

04-03-2005, 04:35 PM
depends on what sound you're looking for. 20-30 hz for sq, 30-40 for sql, and 40-50 for spl.

04-03-2005, 05:51 PM
I'm looking for that deep sounding bass that you feel in your chest. So about how many hz would that be?

04-03-2005, 05:54 PM
I'm looking for that deep sounding bass that you feel in your chest. So about how many hz would that be?
1,000,000,000,000 hertz

jk, 32 is a good number

04-03-2005, 06:02 PM
how about 28hz?

04-03-2005, 06:17 PM
28 would hit the lows pretty good. what music do you listen to?

04-03-2005, 06:21 PM
rock and rap

04-03-2005, 06:31 PM
yea 28's good if you want to be able to really hit those lows.

04-03-2005, 06:31 PM
28Hz would be a good tuning.

04-03-2005, 06:35 PM
I've tried using George's design walkthrough... but I don't completely understand what I'm doing... So I know my max dimensions and what I want the box tuned to... what do I do next?

04-03-2005, 06:49 PM
did you want to use a slot or pvc pipe?

04-03-2005, 06:52 PM
I'd like to slot port

04-03-2005, 07:05 PM
you're gonna have a really hard time figuring all this out quickly. you have to use trial and error. establish your port area, calculate your box volume with sub displacement, try a port length, calculate port displacement, subtract that from box volume, and calculate frequency.

04-03-2005, 07:10 PM
Where do I start, for example how do I know what my port area should be?

04-03-2005, 07:35 PM
just do what your sub company recommends per sub.

04-03-2005, 07:36 PM
actually, scratch thatr. audiobahn recommends a single 3 inch tube, which is ~7 square inches. i'd do a minimal 12 inches per sub. it wont hurt.