TH-18 Flat to 35hz! (Xoc1's design) - Page 118 - diyAudio
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Old 19th October 2012, 09:25 PM   #1171
kctess5 is offline kctess5  United States
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Quote:
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!
I plan to take 10 meter measurements once all four are done and I figure out how to make my macbook use the Behringer sound card as input so I can use the SPL meter.

Quote:
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 would like to do this but I have yet to find a source that would be cheap enough to do all 4 for a reasonable source. Any ideas?

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135.7 db@ 1m


That's about what I model on my computer at the power I was running so that makes me feel good haha
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Old 19th October 2012, 09:30 PM   #1172
Mark Kravchenko --- www.kravchenko-audio.com
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You can get metal grill material from PE

And you can bend it over a plywood form if you use some simple metal forming principles.

Clamp it firmly to the form, and whack it with a soft faced hammer, a dead blow hammer is better. You need to notch the corners so that everything meets up correctly but it is not really all that difficult.


You just finished making a rather complicated box, what yah afraid of now?


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Old 19th October 2012, 09:35 PM   #1173
kctess5 is offline kctess5  United States
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Originally Posted by mwmkravchenko View Post
You can get metal grill material from PE

And you can bend it over a plywood form if you use some simple metal forming principles.

Clamp it firmly to the form, and whack it with a soft faced hammer, a dead blow hammer is better. You need to notch the corners so that everything meets up correctly but it is not really all that difficult.


You just finished making a rather complicated box, what yah afraid of now?


It's not the difficulty of it its the cost. If I remember right pe grills are like $50
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Old 19th October 2012, 09:39 PM   #1174
Mark Kravchenko --- www.kravchenko-audio.com
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Dayton Audio SG2230-6RFL Flat Metal Grill Pair 262-878
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Old 19th October 2012, 09:46 PM   #1175
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Originally Posted by kctess5 View Post
I would like to do this but I have yet to find a source that would be cheap enough to do all 4 for a reasonable source. Any ideas?
I have a local grille guy, but he is over 5000 miles away from You.
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Old 20th October 2012, 04:19 AM   #1176
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Hi Martin,
You have mail!
Cheers,
NS
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Old 21st October 2012, 02:16 PM   #1177
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Originally Posted by Xoc1 View Post
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
Hi,
You are correct I swapped them,I used a templet to align screw holes when the side went on and that's were I got the measurements from I should have made a drawing,but impatient,lol.Sorry for the mix up!
NS

Last edited by noSmoking; 21st October 2012 at 02:18 PM.
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Old 26th October 2012, 11:53 AM   #1178
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Originally Posted by mwmkravchenko View Post
I believe it was jbell who said that grill is quite flimsy. He recommended the Dayton square grill. This is what I'm using, along with acoustically transparent foam behind it to stop the 'ringing' of the grill and for an extra layer of drink-spill protection.
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Old 26th October 2012, 11:59 AM   #1179
NEO Dan is offline NEO Dan  United States
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Both are thin @ 1.2mm, if you want a stronger grille just put a curve in it.
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Old 26th October 2012, 12:10 PM   #1180
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Yeah, they are both thin. The square grill just seems to have a bit more material intact. The circles are pretty close together on the other grill - maybe that's the reason.
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