PDA

View Full Version : Box Dims



Luminare
06-26-2004, 08:18 PM
I think I have this figured out but I am not sure I have been working with WinISD a bit to figure it out, The Sub I am using is an
AudioBahn Alum12Q
FS:22.4Hz
Qts:0.47
Qes:0.52
Qms:4.8
Vas:76L
Vas:2.66ft^3
Re:5.4ohm
Le:2.7mH
Mmd:186Grams
Xmax:+/-14mm
RMS:1000W
Sd:0.049M2
EBP:47
Freq Resp:18Hz-500Hz
Efficiency:96.4db
Depth:5 5/8''
Hole:11 1/8''
Diam:12 3/4''
Displacement:0.18ft^3

The AudioBahn Box Specs suggest:
Air Space: 1.75ft^3
Port Size:(1)4x12.3
Port Vel:14.71%
-3dB: 30.1Hz
Tune Freq: 35Hz
Sub Disp:0.18
Port Disp: 0.092
Total Vol:2.0ft^3

Im driving a Civic HatchBack with a large trunk space so I made the box a tad bigger at 4.0ft^3 Is this an ok thing to do? I measured out a box thats 35.15'' x 13.25'' x 19'' with a port thats 8.95'' x 3'' x 10.10'' Deep and tuned to 35Hz On WinISD it shows a peak curve at about 39Hz 6.7dB... Is this alright, Im more techno hiphop style music, Quality doesnt have to be great I know its an AudioBahn ... but I was wondering if someone could check the numbers and all..?

Also what do you guys do to brace the box well?

Thanks. :toast:
J

Luminare
06-27-2004, 07:20 PM
I think Im the only one that looked at this post 17 times ~~
:rotflol:

Trixter
06-28-2004, 05:24 PM
WinISD is very inaccurate at finding port length. If your good with numbers, go to www.jlaudio.com go to box building in the turtorial section and use the formula there.

jleecong
06-28-2004, 07:07 PM
how is it innacurate...?Just doesn't give the correct values. I saw another post where WinISD suggested a 87" port, longest side was like 20".

Example (http://www.caraudio.com/vb/showthread.php?t=61692&highlight=WinISD) just do a search.. There are a lot of problems, complaints.

Luminare
06-29-2004, 01:22 AM
I know this program might be old Im not sure, its Dos based but what do you guys think of the accuracy of BlauBox? I tried it out with my designs and decided to go with a Tube Port, 5'' Diam 7.09'' Long as a good start, I get different results from WinISD but Blaubox is made by Tom Breithaupt of Blaupunkt/USA. Im going to look around for some more and test my results. Ive modified the box a little

35.125x19x13.25 comes out to be 4cuft and the port I specified above. ~~

I was wondering on bracing and also on mounting a tube style port. Im going to right now to do a search. :clap:

Trixter
06-29-2004, 01:22 PM
If your going to do a round port I highly recommend Precision ports from www.partsexpress.com.