Julian,
Uh... I know you said you're leaving this thread, but anyway...
It seems like your analogy of 10 foot vs. 1 inch driver doesn't relate at all to the 40's floor mounted deep bass woofer and mid room height, slightly wider band bass woofer vs. the X's w/ the same drivers ,just one being a 12" instead of a 10" and both near-floor mounted?
It seemed like you were saying the diff. in the 10 foot vs. 1 inch driver comes from where you're measuring it as you can move one meter up from the 1" driver and it'll drop it's SPL, but of course moving one meter up from a 10' driver and you'll still be in front of the driver and not loose SPL's.
People don't measure SPL by moving verically along a speaker, they move away from a driver.
In the 40's case the dual woofers in the 40's producing the 200Hz in your analogy would be acting as one driver (and why the design works even though those two drivers so far apart) to make that 5 and a half foot long soundwave.
It's like my dual 15" Tempest subs...
If I level matched them to my previous dual 12" Shiva subs (smaller version of the same driver. as is the 10" megawoofer in the 40 and 12" megawoofer in the X right?) the 15's are working much less than the 12's are, but both are moving the same amount of air.
The 12" woofers have less area than the 15's, but at the same SPL output as the 15's the 12's are moving further in and out equaling the same SPL and volume of air movement.
Brian,
I didn't know the cabinet was HDF not MDF. Seemed like no one else knew OR corrected anyone saying 'MDF'.
Hey, that's another good thing learned from this thread!
On the face thickness...
You kinda just repeated yourself though by saying "-The front baffle is indeed 5 3/4" thick."
I think you missed what I was asking about...
As far as I understand... the 'ground down' 'set back' part of the face on the sides of the Neos is 1.5" thick (I'm getting what I can from your web site info on it), not 5.75" thick.
The only part that is the 5.75" thick is the part that sticks out that the Neos attach to right?
But that part must be only 3/4" or 1" wide there (or maybe 1.5" max) or that section of HDF would stick out past the neo's edge (which from the pic.. it doesn't) OR the HDF would block the backside of the Neos (which I couldn't imagine you'd do)?
It'd be like taking two long sheets of 1.5" think MDF that were 5.75" wide and glueing them together at a right angle and calling it 5.75" THICK.
Technically true, but seems to be somewhat misleading.
It seems like you mean 5.75" DEEP -which may SEEM just like a synonym, but really not how people use these terms.
People usually use the term 'thickness' to describe the thinnest part of a section of wood.
Like if you buy a 4' x 8' x 3/5" sheet of MDF at Home Depot. No one says it's 4' or 8' thick. Everyone says it's 3/4" thick.
Also... maybe you missed this question...
Can people expect cross bracing like this in the 40's being made in China?
