Lab12 in a ported enclosure - WinISD

toshiba_nz · 26th January 2008, 10:45 AM

I was playing with WinISD and came up with this:

How accurate can I expect this to be, and why such a smooth roll off over 200Hz ? (given all the tapered Horn sims get crazy over 100Hz

Thawach · 26th January 2008, 04:03 PM

Hi. Toshiba

I don't know what it is. v0.5 it works to be the same as your.
first time i think that have something is close my port.

Now look this is on 0.6

i feel that i must to change the program again.

regards

/Thawach

BHTX · 26th January 2008, 06:00 PM

toshiba_nz:

It's trying to simulate the effect of Le (inductance).
I've found that it isn't accurate.

toshiba_nz · 26th January 2008, 06:56 PM

Hi Thawach,
Here is the port pic.

I had a bad feling about it. According to the graph its super smooth from 100Hz to 500Hz (down 3db at 500) and would appear to continue to smoothly roll off all the way to 1k+???

Hi BthX, so what should I use to accurately model this driver in a vented enclosure?

Thawach · 26th January 2008, 07:23 PM

Hi

I think to be the same. Why is -3 db at 500 hz+?

it will be problem when you use xo on this program.

i will try the other program.

regards

toshiba_nz · 26th January 2008, 07:39 PM

Hi Thawach,
Re the manufactures graph. How does a box/room/ports change that graph(which is their claim) to the one from WinISD? And look at this http://www.eminence.com/pdf/cab-lab-12.pdf
Look at how smooth the graphs are!

Thawach · 26th January 2008, 07:47 PM

Hi

It may be drop because the size of box.

The box of your is too large(240)

regards

Thawach · 26th January 2008, 07:51 PM

and here

Brett · 26th January 2008, 07:54 PM

Quote:

Originally posted by toshiba_nz
Hi Thawach,
Re the manufactures graph. How does a box/room/ports change that graph(which is their claim) to the one from WinISD? And look at this http://www.eminence.com/pdf/cab-lab-12.pdf
Look at how smooth the graphs are!

Eminenece tell how they come to those figures. Copy the data into WinISD and see if you come up with the same. I believe their software is a licenced proprieary version of Bassbox6.

Box modelling software really only gives LF response and can't usually take into account the breakup modes an other anomolies in the driver at the top end on it's range. I usually ignore everything in a sim > 2 octaves above F3 and use measurements for that.

toshiba_nz · 26th January 2008, 08:00 PM

Hi Thawach,
Thanks for the sim. What software is that?
Hi Brett, ok, ill give it a try.

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26th January 2008, 06:00 PM	#3
BHTX diyAudio Member Join Date: Feb 2006	toshiba_nz: It's trying to simulate the effect of Le (inductance). I've found that it isn't accurate.

26th January 2008, 07:39 PM	#6
toshiba_nz diyAudio Member Join Date: Aug 2007	Hi Thawach, Re the manufactures graph. How does a box/room/ports change that graph(which is their claim) to the one from WinISD? And look at this http://www.eminence.com/pdf/cab-lab-12.pdf Look at how smooth the graphs are!

26th January 2008, 08:00 PM	#10
toshiba_nz diyAudio Member Join Date: Aug 2007	Hi Thawach, Thanks for the sim. What software is that? Hi Brett, ok, ill give it a try.

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