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Can someone please calculate a box for me?

D

dynoryder

Active Member
Hi all I am building a box for a bass driver and I cant seem to find any good calculators to build it.

The t/s parameters are.

qms: 3.5
qes: .3
qts: .273
vas: 49l/1.73ft>3
fs: 30hz

I would like to build a ported enclosure but it is not important if it is sealed or ported. I have heard that these woofers like any thing between 2ft>3 to 5 but that just seems to broad to me.

Thank you in advanced.
 
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Look for WinISD, and if you want something simple that works try:

1. To calculate enclosure volume: http://www.diyaudioandvideo.com/Calculator/Box/

2. To calculate enclosure dimensions: http://www.diyaudioandvideo.com/Calculator/Volume/

I have compared Win ISD results with the other one, and they are the same. If you are a beginner highly recommend the DIY, then move to WinISD that gives you more options.

For the parameters you gave, you need a 0.3 cu.ft. enclosure, and it will give you an f3 of 78Hz. Internal dimensions is approx. 8" x 8" x 12". To calculate a ported box, the driver size is needed.

There is more to this, but for starters it is a great tool.
 
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PR Audio said:
Look for WinISD, and if you want something simple that works try:

1. To calculate enclosure volume: http://www.diyaudioandvideo.com/Calculator/Box/

2. To calculate enclosure dimensions: http://www.diyaudioandvideo.com/Calculator/Volume/

I have compared Win ISD results with the other one, and they are the same. If you are a beginner highly recommend the DIY, then move to WinISD that gives you more options.

For the parameters you gave, you need a 0.3 cu.ft. enclosure, and it will give you an f3 of 78Hz. Internal dimensions is approx. 8" x 8" x 12". To calculate a ported box, the driver size is needed.

There is more to this, but for starters it is a great tool.
Click to expand...

See this is where I find it hard as it is a 15" 3000w woofer.

Also the f3 should be 35hz.
 
dynoryder said:
See this is where I find it hard as it is a 15" 3000w woofer.

Also the f3 should be 35hz.
Click to expand...

Are you 100% sure of those TS parameters? What brand/model is the woofer? There is a parameter that might not be correct, as in a Ported enclosure (0.48 cu. ft.) you would need a port that is 6" in diameter X 74-5/8" long. A 6'-3" long port is crazy. The Vas parameter is wrong, it should be around 9 to 11 cu.ft. If a Pro Audio woofer, it might be around 7 to 9 cu.ft. So, let's take 9.5 cu.ft. as a random guesstimate.

A ported box would be 2.62 cu.ft. with a 6" x 9-11/16" port. The volume is within the range mentioned in your original post. But, f3 is 52.89Hz, which is higher than the 35Hz you mention. If not mistaken, someone can correct me if I am, Vas will affect the enclosure volume/size and port dims. It doesn't affect f3 much.

Again, what I believe is that one or more parameters are wrong. Qts might also be incorrect for a 300 Watts driver.
 
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I have enough for a 8 cube foot.

I designed a box that was a 31Hz box at 7 cube but I have found that TC sounds seems to recomend a 44Hz box?
 
I assume you are looking to use this for home theater based on size.

Are they recommending 44Hz for use in-home or in-car? Big difference....

Were they aiming for maximum SPL, flattest response, lowest extension, smallest cabinet, or highest power handling? They can't have "all of the above" so they picked one (or two?) to optimize.

This is where the modeling comes in handy. Try 31 and 44 and see what the differences are. Only you can decide which set of compromises are best for your system.
 
donprice said:
I assume you are looking to use this for home theater based on size.

Are they recommending 44Hz for use in-home or in-car? Big difference....

Were they aiming for maximum SPL, flattest response, lowest extension, smallest cabinet, or highest power handling? They can't have "all of the above" so they picked one (or two?) to optimize.

This is where the modeling comes in handy. Try 31 and 44 and see what the differences are. Only you can decide which set of compromises are best for your system.
Click to expand...


Well this sub is a sound quality optimized sub.
 
donprice said:
I assume you are looking to use this for home theater based on size.

Are they recommending 44Hz for use in-home or in-car? Big difference....

Were they aiming for maximum SPL, flattest response, lowest extension, smallest cabinet, or highest power handling? They can't have "all of the above" so they picked one (or two?) to optimize.

This is where the modeling comes in handy. Try 31 and 44 and see what the differences are. Only you can decide which set of compromises are best for your system.
Click to expand...


It is a car sub it is based on sound quality for the competition car sound off's. It is high power but the spl versions are twice the rms and have half the voice coil layers and only two coils.

I bought this sub years ago for my wagon I crashed it so it sat in the shed I am now setting it up for home use. I am using a sound stream 4000w car amp a 40amp ac to dc converter and 3 battery's with as many caps as I can afford.
 
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