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Old 16th June 2012, 10:23 PM   #1
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Question TH Questions

Hello,

i have tried modeling and building TH in past with no success.Don't know what was wrong.Maybe bad T/S or calculations.I will give it one more try though,as i read about so many succesful stories around the forums.

I have some questions.

1. I tried to model a car subwoofer and come up with a classic U type response that doesn't seem to get flat no matter what i do,unless i increase the S1 up to a certain point over the S2 value where it gets really flat.For example i set S1 to 400 and S2 to 90 and the response is really flat.Is this acceptable in practice?
2. Is it right to select the combined response to evaluate the response of the TH?It is the only way i get a good response.Is it OK to set the Path Length Difference between Port distance and listener and Speaker distance and listener as 0?
3. Can you suggest any easy program for folding the TH?I have this "Stepped TH" but can't get it to work at all.It seems locked.I don't have Excel though.I open it with Libre Office 3 (Windows 7) and can't enter values.

Please check the attachements!

Any help about the design is welcome
Attached Images
File Type: jpg Test TH Input Parameters.jpg (113.0 KB, 102 views)
File Type: jpg Test TH SPL Graph.jpg (82.1 KB, 103 views)
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Old 18th June 2012, 05:15 PM   #2
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Anyone?
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Old 18th June 2012, 06:11 PM   #3
epa is offline epa  Netherlands
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go to >tools>driver arangement>check th.
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Old 18th June 2012, 06:49 PM   #4
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by luv2bass2 View Post
Anyone?
Nice! A well known driver...very impressive x-max, nice driver dimensions

b
Attached Images
File Type: jpg 1_Unknown_TH_Q-xmax_Q-Driver-dim..JPG (162.6 KB, 72 views)
File Type: jpg 2_Unknown_T-TQWT_Q-xmax_Q-Driver-dim..JPG (158.9 KB, 71 views)
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Old 18th June 2012, 06:59 PM   #5
GM is offline GM  United States
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Brand/model?

TIA,

GM
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Old 18th June 2012, 07:38 PM   #6
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It is a custom made subwoofer model!
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Old 18th June 2012, 08:06 PM   #7
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by luv2bass2 View Post
It is a custom made subwoofer model!
OK, This one:Need an extra maximum overhead cost(Eq:s and signal-delay units) bedroom TH(I would never Rec anyone to ever consider build this type of TH, of course)?

b

PS: Though,Should sound good after a couple of six-packs.
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File Type: jpg 2xTest12inch_Custom-TH_20-60Hz.JPG (374.3 KB, 62 views)
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Old 18th June 2012, 08:25 PM   #8
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It is going to be used in a car hatchback trunk,so space is a limitation.I can get up to 100 liters net + the wood and driver volume.Also i want to use only one driver not 2 as i see in your simulation!

Thanks for your effort though.

I changed the option from Normal to Tapped Horn and still get better response when the first segment is larger than the second.

I am more familiar with WINISD.What is the enviroment i should choose to be comparable to WINISD simulation?2xPi?
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Old 18th June 2012, 11:21 PM   #9
OscarS is offline OscarS  United States
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If it's going in a car, a more realistic simultion would be 0.5pi. Thats what it's for: to change the radiation environment.
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Old 18th June 2012, 11:34 PM   #10
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Hi there L2B2: When I down loaded HR several years ago, an application note stated that HR may not (or will not) run fully without a full copy of Excel. I'm running HR-v22 on WIN-7 with a full copy of Excel ($150 worth). Also, I've have flattened SPL plots by using s-1>s-2<-3, however this shape does not meet the TH inventors (TD) defination for a contineously incressing path. So, it may function anyway, maybe defined with your name L2B2.Likewise, it may be difficult to fold (or impossible to fold to match the simulation). Maybe someone will build one of these and find out how it sounds and measures. ....regards, Michael

Last edited by j.michael droke; 18th June 2012 at 11:36 PM. Reason: fixed <>
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