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 23rd March 2006, 08:12 PM #211 lovechild   diyAudio Member   Join Date: Oct 2005 Hello, is it possible to simulate aperiodic cabinets with the worksheets now available? thanks, martin
MJK
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Join Date: Feb 2002
Location: Clifton Park, NY
Hello Bostjan,

Thanks for the positive feedback.

Quote:
 Is there a posibility to simulate JENSEN TRANSFLEX enclosure with combination of several worksheets. I've tried this with offset driver WS but I don't know if I understand adding and substracting dbs very well.
To be honest, I do not know what a JENSEN TRANSFLEX enclosure looks like, based on the name alone it sounds complicated. If you have a picture or drawing I might be able to provide a few hints, if you post it here I am sure others might also chime in. You probably should start a new thread.

Quote:
 Sorry for my English
No apologies needed, your English is just fine.

Quote:
 (I think much faster than I am able to type in English)
Me to.

MJK
Account disabled at member's request

Join Date: Feb 2002
Location: Clifton Park, NY
Hi lovechild,

Quote:
 is it possible to simulate aperiodic cabinets with the worksheets now available?
You probably can simulate an aperiodic enclosure in MathCad. My guess would be to use a port length equal to the wall thinkness of the enclosure and specify 1 lb/ft^3 of fiber stuffing. You can't go higher then 1 lb/ft^3 or the curve fit goes unstable and your results will get really weird. Then you would need to vary the diameter of the port until you achieve an aperiodic response typical of whatever venting arrangement you are using. The port diameter would have no physical relationship with the real vent size and is kind of an answer after the fact. But I think that this would work and maybe you could apply what you learn to other designs using the same damped vent arrangement.

soongsc
diyAudio Member

Join Date: Mar 2005
Location: Taiwan
Quote:
 Originally posted by MJK Hi lovechild, You probably can simulate an aperiodic enclosure in MathCad. My guess would be to use a port length equal to the wall thinkness of the enclosure and specify 1 lb/ft^3 of fiber stuffing. You can't go higher then 1 lb/ft^3 or the curve fit goes unstable and your results will get really weird. Then you would need to vary the diameter of the port until you achieve an aperiodic response typical of whatever venting arrangement you are using. The port diameter would have no physical relationship with the real vent size and is kind of an answer after the fact. But I think that this would work and maybe you could apply what you learn to other designs using the same damped vent arrangement.
What if the port is not round but rather a long rectangle like one of the Thiel CS1.6 speakers, is there any way to simulate that? Can you simulate an enclosure with two ports?
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MJK
Account disabled at member's request

Join Date: Feb 2002
Location: Clifton Park, NY
Quote:
 What if the port is not round but rather a long rectangle like one of the Thiel CS1.6 speakers, is there any way to simulate that? Can you simulate an enclosure with two ports?
Not at this time in Ported Box. The closest you can get would be to edit TL Sections and attempt to model the geometry, TL Sections has a rectangular opening.

I don't have any worksheets with dual ports.

lovechild
diyAudio Member

Join Date: Oct 2005
Martin, thanks for explaining!

regarding the rectangular openening I once had copied a post in another forum, I unfortunately I can't find the link anymore. That's what was said:

Quote:
 If you want to model aperiodic enclosures, his worksheets are EXCELLENT for that effort. If you have a highly tapered TL, 12:1 for example, and stuff it, you will have an aperiodic enclosure more than a TL. His worksheets also accomodate stuffed, vented enclosures as well.

e-star
diyAudio Member

Join Date: Nov 2005
Location: slovenia
jensen transflex

Quote:
 To be honest, I do not know what a JENSEN TRANSFLEX enclosure looks like, based on the name alone it sounds complicated. If you have a picture or drawing I might be able to provide a few hints, if you post it here I am sure others might also chime in. You probably should start a new thread.

Jensen Transflex is a transmision line enclosure but the driver is enclosed in a enclosure. I will start a new thread in a subwoofer forum if there is any posibility to simulate this enclosure with worsheets. Here is a picture.

Cheers

Bostjan Skok
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 transflex1-1.jpg (95.6 KB, 545 views)

 26th March 2006, 09:47 PM #218 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Greets! I bet Tom Danley wouldn't be too pleased to see it made public. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
 26th March 2006, 10:37 PM #219 Scottmoose   diyAudio Member     Join Date: Mar 2005 Location: UK At this rate we'll be trying to sim those madcap JBL Aquarius things from the early 1970s. Now, there's an idea... __________________ "'That'll do", comes the cry of the perfectionist down the ages.' James May -The Reassembler www.wodendesign.com Community sites www.frugal-horn.com http://frugal-phile.com/
planet10
frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Quote:
 Originally posted by GM I bet Tom Danley wouldn't be too pleased to see it made public.
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