WinISD and Bassbox Pro - different simulations

Defo · 14th January 2010, 10:26 PM

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?

TheSeekerr · 14th January 2010, 10:42 PM

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

just a guy · 10:47 PM

Quote:

Which software should I trust?

Hornresp. It won't do automatically generated alignments, but in the end that's probably for the best.

Ron E · 14th January 2010, 11:09 PM

Vb=Vas/((Qtc/Qts)^2-1) Damping may gain you ~15% in volume.
That's your reality check.

Defo · 14th January 2010, 11:18 PM

Quote:

Originally Posted by TheSeekerr

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.

bjorno · 14th January 2010, 11:30 PM

[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

Defo · 14th January 2010, 11:49 PM

Heres Eminence BP102....

Defo · 14th January 2010, 11:55 PM

Seas W21EX-001...

Defo · 12:12 AM

Quote:

Originally Posted by TheSeekerr

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.

Ron E · 15th January 2010, 05:25 AM

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...

14th January 2010, 11:09 PM	#4
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Vb=Vas/((Qtc/Qts)^2-1) Damping may gain you ~15% in volume. That's your reality check. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

15th January 2010, 05:25 AM	#10
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	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... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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14th January 2010, 10:42 PM	#2
TheSeekerr diyAudio Member Join Date: Jan 2008	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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