TH-18 Flat to 35hz! (Xoc1's design) - Page 100 - diyAudio
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Old 19th September 2012, 10:43 PM   #991
Djim is offline Djim  Netherlands
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Hi Martin,

Indeed those imaginary corner lines seem to line up very well, thanks for the visualisation.
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Old 19th September 2012, 10:59 PM   #992
grec13 is offline grec13  United States
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Hi guys.
It seems that DSL used not only cone correction but some kind of "V" throat. (post 841)
Or I'm wrong?
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Old 19th September 2012, 11:08 PM   #993
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Quote:
Originally Posted by Xoc1 View Post
Hi Djim
I don't see the different shape being a problem.
The difference from the centre to the sides changes as the volume we are accounting for is round and the cone correction is linear. The 3 lines I have simplified it to are just an approximation to enable the opposing shape to be built in timber.
If you look at this screen grab you can see that the lower cone correction line representing xmech having a wider flat face actually still represents a fairly linear path to the opposing timber built cone corrected throat.
An imaginary line drawn thru the imaginary corners seems to line up quite nicely!
Regards
Martin (Xoc1)
Hi guys ,
Have I got this correct,The above diagram is about the same as adding pieces of wood beside the stub,so if that's correct then could you make some optimal measurements for me to make one ,I would have to guess at them at this point ,and should they be circular or straight across as the stub is now?
I have a 500 watt amp ,I set the hpf at 36hz,I am using a DCX 2496,

Thanks
NS
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Old 20th September 2012, 12:44 AM   #994
Djim is offline Djim  Netherlands
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Hi noSmoking,

The Stub+Disk method is for existing models of the Xoc1-TH18. The "diagram above" is for a new TH18 that has a different lay-out.
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Old 20th September 2012, 05:13 AM   #995
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Hi Djim,
I see what you're saying I'll try the disks for now,
Thanks,
NS
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Old 20th September 2012, 03:31 PM   #996
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Quote:
Originally Posted by grec13 View Post
Hi guys.
It seems that DSL used not only cone correction but some kind of "V" throat. (post 841)
Or I'm wrong?
The DSL TH-118 uses a "V" throat (no other "cone correction" per se), similar in concept to post #528 figure 3, go back to post 528 to see a crude example of how it is implemented.
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Old 20th September 2012, 05:07 PM   #997
tb46 is offline tb46  United States
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Default Simple Cone Correction

Hi,

Here is an example of what I would call a simple cone correction:

Regards,
Attached Files
File Type: pdf simple cone correction.pdf (26.4 KB, 151 views)
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Old 20th September 2012, 05:47 PM   #998
Djim is offline Djim  Netherlands
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Hi Oliver,

That corresponds more or less with the Disk method. Most people find 2 disks of 18mm as 'enough' for existing TH's.
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Old 20th September 2012, 06:43 PM   #999
tb46 is offline tb46  United States
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Hi Djim,

"...That corresponds more or less with the Disk method..." I agree, at the wavelength in question the differences just don't matter.

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Old 20th September 2012, 07:10 PM   #1000
ODougbo is offline ODougbo  United States
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Still lurking and the 1000th caller.
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