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I'm pretty sure that SDX design does not couple the magnet structure to the rear of the box. Look at the horizontal brace behind the driver. It has a large arc that totally clears the magnet.
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If you read a few pages of starting
from here, you'll see were I ask specifically:
When I look at the designs for both sealed and ported boxes on the CreativeSound web site, they show an internal magnet brace that fits snuggly around the magnet and then another brace presses against the back of the magnet and the rear of the box. I've never seen this before?
and also in part:
it wasn't the vertical brace with the 'snuggly' fitting hole for the magnet that I found as strange as the horizontal brace that is so tight as to connect the magnet to the back wall of the box.
So, I am correct then, that the horizontal brace in your diagram places some tension on the back of the magnet to physically couple it to the back of the box?
The designer of the boxes on the CSS site says:
Yes it does. If you look at the designs on my websites you will see that i use this alot
and:
A driver can & does transmit a large amount of mechanical/newtonian energy into the box. Without a snug brace -- and by snug i mean as tight a fit as possible (with a woofer with as stout a frame as this you could get away with depressing the wood at the back and tension loading the front baffle) -- all of that energy gets transmitted directly to the weakest piece in the box (the baffle). These braces distribute that energy to as much of the box as possible so that the energy that any one panel has to dissipate/damp/deal with is dramatically lower.
brucek