Box Dims

[Luminare]

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 Size1)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. //content.invisioncic.com/y282845/emoticons/toast.gif.bc0657bf54b9ee653b6438524461341e.gif

J

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[Luminare]

I think Im the only one that looked at this post 17 times ~~

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[Trixter 10+ year member]

WinISD is very inaccurate at finding port length. If your good with numbers, go to http://www.jlaudio.com go to box building in the turtorial section and use the formula there.

 

[jleecong 10+ year member]

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 just do a search.. There are a lot of problems, complaints.

 

[Luminare]

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. //content.invisioncic.com/y282845/emoticons/clap.gif.178cba2c538c68e720c727fcb024b19c.gif

 

[Trixter 10+ year member]

If your going to do a round port I highly recommend Precision ports from http://www.partsexpress.com.