Mcm 8" 55-2421 Ts parameter

[jbell]

Originally Posted by tb46

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...

[tb46]

Hi jbell,

I thought that bifurcated section looked familiar. :-)

Regards,

[kornnylike]

So these are the designs i have in mind

something easy to build

excuse my drawing



EASY BUILT FLH.jpg

[epa]

the one on the right looks intresting.
jbells fold on the double mcm looks intresting too

[kornnylike]

Originally Posted by epa

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.

[jbell]

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.

[kornnylike]

Originally Posted by jbell

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

[jbell]

Originally Posted by kornnylike

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?

[kornnylike]

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

design.jpg

design1.jpg

design2.jpg

[jbell]

Originally Posted by kornnylike

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....