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Old 12th September 2006, 12:50 PM   #1
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Default Box size help?

Hello, I've used a few box size calculators from the Net, but I keep getting different Volume sized from each calculator?? Can someone have a go and see what you come up with. My Bass driver is a Seas 10" CA25RE4X/DC. Vas=187.9, Qms=3.63, Qes=0.34, Qtc=.31, Free air resonance=25Hz,
This will be a vented box, Vent details??
Thanks for your help.
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Old 13th September 2006, 02:01 AM   #2
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this is straight from winisd pro

79.65ltr
tuned to 31hz
port - 10cm diameter 23.5 long

changing things like volume and port tuning alter the response.

Suggest you download a copy and play with it yourself.
Dont forget to add the 'room gain' which I think is about 6db/oct.
This will also depend of size of room etc.
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Old 13th September 2006, 06:10 AM   #3
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0caukrell, thanks for your assistance. Are the figures you quoted for a box allignment "QB3 Quasi-Butterworth"?
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Old 13th September 2006, 06:11 PM   #4
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BoxPlot gives 83 liters for maximally flat. Pretty close. It calls for 7.62cm dia port 10.59cm long FWIW.

mike
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Old 13th September 2006, 06:29 PM   #5
Svante is offline Svante  Sweden
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A design with a 98 litre box tuned to 24 Hz gives this response:

Click the image to open in full size.

The blue curve includes the baffle step for a 30x60 cm baffle, the red ignores it. The box is filled to 40% with ideal isothermailsing material (ie apparent box volume is 113 litres).

The reason that you get different box volumes from different softwares is that there isn't one "correct" way to do it. There are only more or less reasonable ways.
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Old 14th September 2006, 01:49 AM   #6
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Quote:
Originally posted by SamClassA
0caukrell, thanks for your assistance. Are the figures you quoted for a box allignment "QB3 Quasi-Butterworth"?
Yup.

Why not download winisd (pro or not) and have a play ??
It is free.
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Old 14th September 2006, 02:24 AM   #7
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Once again thanks for all your replys,
I downloaded WinISD 0.50a7, and got these figures: Box Vol 79.65, Tuning f 30.94Hz, Vent Dia 10.2cm, Vent length 24.6 cm,
slighty diff than your? Maybe3 because Diff Version of WinISD?
Another Quest? If I make the Box Vol larger, say, 100Litres, will this give me a better bass responce? or Lower Tuning frequency, or am I on the wrong track here?
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Old 14th September 2006, 02:32 AM   #8
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you got the exact same as me (no suprise) reason for the different port is I changed it from 10.2 to 10cm diam.

bigger is not always better.

if you are really serious about how it will work in a particular room, research 'room gain'.
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Old 14th September 2006, 11:54 AM   #9
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just another thought? Now that we calculated the Box Volume using the various "calculators" do we deduct the driver and port volumes from thew calculated value to come up with the final Box Volume?
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Old 15th September 2006, 02:01 AM   #10
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The calculated volume will NOT include speaker and port volumes.
So if it says a 10ltr box, and the driver is 2ltr, port 3ltr, bracing 2ltr, then you need to design a box of 10+2+3+2 = 17ltrs.
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