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Old 14th January 2010, 10:26 PM   #1
Defo is offline Defo  Norway
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Default WinISD and Bassbox Pro - different simulations

Ive experienced over time now that WinISD and Bassbox Pro is generating different simulations for the very same drivers. Take the JBL 2226H for instance. Same driver, same closed box Qt below.

Which software should I trust?
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Old 14th January 2010, 10:42 PM   #2
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Given the VAS of that driver is quite high, I'd be rather sceptical of any software suggesting 15L.

My first thought is that maybe it's a regional settings issue - I think it looks weird using a comma for a decimal seperator, so maybe Bassbox does too
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Old 14th January 2010, 10:45 PM   #3
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Quote:
Which software should I trust?
Hornresp. It won't do automatically generated alignments, but in the end that's probably for the best.

Last edited by just a guy; 14th January 2010 at 10:47 PM.
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Old 14th January 2010, 11:09 PM   #4
Ron E is offline Ron E  United States
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Vb=Vas/((Qtc/Qts)^2-1) Damping may gain you ~15% in volume.
That's your reality check.
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Old 14th January 2010, 11:18 PM   #5
Defo is offline Defo  Norway
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Originally Posted by TheSeekerr View Post
Given the VAS of that driver is quite high, I'd be rather sceptical of any software suggesting 15L.

My first thought is that maybe it's a regional settings issue - I think it looks weird using a comma for a decimal seperator, so maybe Bassbox does too
Mind that the simulations above is for a closed box. But in a vented box, the two softwares gives different max spl, and vent length. Both in the exact same box size and vent diameter.
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Old 14th January 2010, 11:30 PM   #6
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[QUOTE=TheSeekerr;2048039]Given the VAS of that driver is quite high, I'd be rather sceptical of any software suggesting 15L.QUOTE]

Hi,

Agree,...and probably caused from bad input parameter data.

b
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Old 14th January 2010, 11:49 PM   #7
Defo is offline Defo  Norway
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Heres Eminence BP102....
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Old 14th January 2010, 11:55 PM   #8
Defo is offline Defo  Norway
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Seas W21EX-001...
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Old 15th January 2010, 12:06 AM   #9
Defo is offline Defo  Norway
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Quote:
Originally Posted by TheSeekerr View Post
Given the VAS of that driver is quite high, I'd be rather sceptical of any software suggesting 15L.QUOTE]

Hi,

Agree,...and probably caused from bad input parameter data.

b
Seems like WinISD wins... Even though Bassbox Pro is a lot more comprehensive.

Last edited by Defo; 15th January 2010 at 12:12 AM.
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Old 15th January 2010, 05:25 AM   #10
Ron E is offline Ron E  United States
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Well, the WinISD beta sim is essentially an undamped sim (the simple equation I give above). Bassbox uses a more comprehensive model, but if you don't choose the proper values for Qa and Ql (and the defaults in the program might be bad) you will get a box that is very small. For starters, try Qa=Ql=10 to 20.

For the 2226H, for example, if you stuffed the box you might be able to get a Qtc of 0.7 in 25 Liters, where if there were only lining on the walls, you would need 35. This is where an undamped sim gets you an answer of 41.6. I don't think there is much support for 14.6L...
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