TH-18 Flat to 35hz! (Xoc1's design) - Page 117 - diyAudio
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Old 17th October 2012, 04:06 PM   #1161
kctess5 is offline kctess5  United States
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Quote:
Originally Posted by noSmoking View Post
Hi Kctress5,
Nice build ,fasst ! too,lol.
NS
Thanks! The bracing ins't quite as good looking as yours but mine aren't going to be run at their absolute max power ratings so I'm not too worried about excessive cabinet flexing.

I will add a few braces in the mouth though before I paint them so they don't walk around
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Old 18th October 2012, 02:25 AM   #1162
NEO Dan is offline NEO Dan  United States
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This was effective:
Click the image to open in full size.
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Dan
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Old 18th October 2012, 02:41 AM   #1163
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Hi Dan,
Looks good I was thinking about braces at the front ,but haven't made the decision on what I will do yet,still thinking ,here's where I am so far! Still making parts for the cross brace.
Cheers,
NS
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Old 19th October 2012, 12:37 PM   #1164
Xoc1 is offline Xoc1  United Kingdom
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Originally Posted by noSmoking View Post
Hi,
If anyone would like to help me out with a sim or hornresp here is what I change all the other measurements are the same,THANKS in advance,any help I can offer just ask!
Thanks alot,
NS
Hi Nosmoking I tried to set out your dimensions for the throat mods but there is something that does not add up. The pic shows a 138 dimension but this seems to be wrong. Can you recheck and add some extra dimensions if possible. I assume the 112 flat piece is positioned central to the baffle cut out?
Regards
Xoc1
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Old 19th October 2012, 02:27 PM   #1165
NEO Dan is offline NEO Dan  United States
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Hi Martin,
If the 112 and 118 are correct, and 112 is parallel to the baffle the value for 138 can be derived without much trouble.
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Dan
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Old 19th October 2012, 03:00 PM   #1166
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Originally Posted by NEO Dan View Post
Hi Martin,
If the 112 and 118 are correct, and 112 is parallel to the baffle the value for 138 can be derived without much trouble.
Is 118 - 188
numeracy dyslexia rules KO
Computer says that 138 mm dimension is WRONG
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Old 19th October 2012, 03:19 PM   #1167
NEO Dan is offline NEO Dan  United States
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I resemble that remark LOL
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Old 19th October 2012, 03:28 PM   #1168
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Nice video!
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Old 19th October 2012, 07:43 PM   #1169
kctess5 is offline kctess5  United States
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Quote:
Originally Posted by BP1Fanatic View Post
Nice video!
Thanks!

Quote:
This was effective:
That looks good. I'll do that before I paint them. I didn't want to do it before testing so that in case I had to take out the driver it would be easy
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Old 19th October 2012, 09:06 PM   #1170
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Originally Posted by kctess5 View Post
That looks good. I'll do that before I paint them. I didn't want to do it before testing so that in case I had to take out the driver it would be easy
The Vee brace was something I came up with after seeing a frequency based analysis of the speaker model.
TH-18 Flat to 35hz! (Xoc1's design)
The biggest fundamental resonance in the cabinet is the horn mouth. The Vee brace counteracts this. With careful positioning removing the driver is still practical.
Of course the alternative is to fit a metal grille. but the bracing is an option for people who are not worried about party animals, or have no metalwork facilities.
I enjoyed watching your video. It is quite humbling to see people from all over the planet build someting I drew up.
I hope you continue with your measurements of the speakers you built. You will need to measure at a greater distance than 1 metre as you are maxing out your db meter!
Each doubling of the distance will give you an extra 6db measuring headroom. 100db at 200 feet (60.96m) is 135.7 db@ 1m
Regards Xoc1
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