Mcm 8" 55-2421 Ts parameter - Page 2 - diyAudio
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Old 8th July 2011, 04:25 PM   #11
jbell is offline jbell  United States
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Quote:
Originally Posted by tb46 View Post
Hi again,

Jbell, littlemike and others have beaten this driver around for quite a while. An interesting thread for a dual driver TH is:

Reed Dual MCM 2421 Tapped Horn - ShopSub - AVS Forum

Looking forward to seeing kornnylike's solution.

Regards,
AVS Forum - View Single Post - Reed Dual MCM 2421 Tapped Horn - ShopSub

yep, mike and I ping'd on the shop sub... Take a read on where the fold came from...

Mike's a good guy, he and I have traded a bunch of useful info... I blame him for some of my DIY'ness...
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Old 8th July 2011, 05:08 PM   #12
tb46 is offline tb46  United States
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Hi jbell,

I thought that bifurcated section looked familiar. :-)

Regards,
__________________
Oliver
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Old 9th July 2011, 12:08 AM   #13
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Default easy built flh

So these are the designs i have in mind

something easy to build

excuse my drawing



EASY BUILT FLH.jpg

Last edited by kornnylike; 9th July 2011 at 12:18 AM.
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Old 9th July 2011, 07:39 AM   #14
epa is online now epa  Netherlands
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the one on the right looks intresting.
jbells fold on the double mcm looks intresting too
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Old 9th July 2011, 10:10 AM   #15
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Originally Posted by epa View Post
the one on the right looks intresting.
The one on the right is the one I also like. The chamber that hold the drivers would be in a
V shape.

Last edited by kornnylike; 9th July 2011 at 10:12 AM.
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Old 9th July 2011, 02:25 PM   #16
jbell is offline jbell  United States
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The problem I have with most of those folds, is they are about 60hz long at most... If you want a 40hz horn, none of them work well. The fold I came up with on the dual mcm allows 2 tapers in a square box, which is also of interest with the mcm driver.

The front chamber is the 'key' that I found for the mcm, along with 8:1 compression.
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Old 9th July 2011, 03:02 PM   #17
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Quote:
Originally Posted by jbell View Post
The problem I have with most of those folds, is they are about 60hz long at most... If you want a 40hz horn, none of them work well. The fold I came up with on the dual mcm allows 2 tapers in a square box, which is also of interest with the mcm driver.

The front chamber is the 'key' that I found for the mcm, along with 8:1 compression.
Jbell you are saying that the horn path of the designs I posted are too short for 35hz
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Old 9th July 2011, 03:14 PM   #18
jbell is offline jbell  United States
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Originally Posted by kornnylike View Post
Jbell you are saying that the horn path of the designs I posted are too short for 35hz
Do your hornresp, get a response you like, and then see if you can fit that length into any of the above folds. My guess is that it won't work.

Here's another thread where this was hashed, and includes a hornresp you could use as a starting point...

Can someone comment on my hornresp simulations on the MCM8?

Last edited by jbell; 9th July 2011 at 03:19 PM.
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Old 9th July 2011, 10:54 PM   #19
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Default more flh design

Designs from tda audio
lets see if any of these will work

design.jpg

design1.jpg

design2.jpg

Last edited by kornnylike; 9th July 2011 at 11:20 PM.
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Old 10th July 2011, 01:57 AM   #20
jbell is offline jbell  United States
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Originally Posted by kornnylike View Post
Designs from tda audio
lets see if any of these will work

Attachment 230583

Attachment 230584

Attachment 230585
I think I might have missed your question somehow.... Are you wanting to build one of these big boxes as designed for mcm 55-2421's? and put in 8 drivers? (4 in each 18" driver location?)

Or are you looking to these designs as folding inspiration and want to make a smaller version that takes a pair of mcm's? (which is what I assumed)

It would be kinda cool I suppose to have a baby tda running mcm's... but it would take some additional horn folding to make it actually perform correctly once you scale it down from 18" drivers to 8's....
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