12" tannoy paper coax and box type. Karlsonator or...?. - diyAudio
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Old 11th May 2015, 09:58 PM   #1
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Default 12" tannoy paper coax and box type. Karlsonator or...?.

I have gotten a pair of Tannoy 12" paper coaxials to build my friend good quality outdoor PA speakers.
Tannoy CMS 12/8 Dual Concentric Ceiling Speaker. The factory specs show a ported box.

I will need to build boxes. Other than a standard ported, does it make sense to consider and try other enclosures in the attempt to squeeze out max performance from these drivers?

TQWT/Karlonator/Sealed TL??

thanks.
Herman
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Old 11th May 2015, 10:51 PM   #2
chrisb is offline chrisb  Canada
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If T/S parameters are not readily available, and you don't have the wherewithal to measure for yourself, I'd be inclined to follow the manufacturer's recommendation. If you retain the net cubic volume and port size, you can play around to a degree with dimensions to suit aesthetics.
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Old 12th May 2015, 06:19 PM   #3
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What Chris says. We did do a miniOnken for a 12" Gold, we measured its specs directly. Performance was OK (bass was excellent). The driver really needed at least an XO rebuild (40-50 year old caps would be long past their best).

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Old 12th May 2015, 08:35 PM   #4
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I am still waiting on my order. Will measure them as soon as I receive them and post measurements.
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Old 12th May 2015, 08:57 PM   #5
freddi is offline freddi  United States
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a Karlsonator12 would probably be fine
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Old 12th May 2015, 09:18 PM   #6
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That's what I was curious about: Karlsonator vs vented box...
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Old 13th May 2015, 01:03 AM   #7
freddi is offline freddi  United States
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I tend to avoid vented boxes

Click the image to open in full size.
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Old 14th May 2015, 04:41 AM   #8
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Default what box to build?

Got the drivers, measured the 12" paper cone (tweeter and crossover disconnected).
Measurements on a open baffle test board:
No "Vas" yet. Is this needed at this point?
tannoy_12_baffle.JPG

Last edited by noviygera; 14th May 2015 at 04:42 AM. Reason: addition
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Old 14th May 2015, 04:57 AM   #9
Greg B is offline Greg B  United States
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Cool. These newfangled measurement devices really do make things faster and easier.

Yeah, you do need Vas. Necessary to see how big the box should be. Got double stick tape and a few nickels?
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Old 14th May 2015, 11:52 PM   #10
xrk971 is online now xrk971  United States
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I use a donut made of plastic modeling clay. Or a donut made of silly putty which doesn't leave a residue in sensitive surfaces. Weigh the clay with a gram scale. The clay is sticky enough to stick to cone and dust cap interface.
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