Re: Re: CSS SD12 Subduction
I don't recall seeing that -- and Bob hasn't asked after it... what are the numbers. It is likely of a nature to add to the other largish SD12 designs (Scott also did a Shadow and a TL) that are of such a size that they will send someone running screaming to the sealed box, or just outrageous enuff that they will get built.
I've been throwing the idea around of a pair of push-push TLs with the larger 15s -- Chris just asks if i really want to test the house's structural integrity?
dave
GM said:
I don't recall seeing that -- and Bob hasn't asked after it... what are the numbers. It is likely of a nature to add to the other largish SD12 designs (Scott also did a Shadow and a TL) that are of such a size that they will send someone running screaming to the sealed box, or just outrageous enuff that they will get built.
I've been throwing the idea around of a pair of push-push TLs with the larger 15s -- Chris just asks if i really want to test the house's structural integrity?
dave
Godzilla said:
Trying to get an 8" to work in a box for a 12" might be pushing it a bit, but i'll defer to GM or Scott... with GM's new BIB Cookbook forumla what do you get?
dave
Re: Re: Re: CSS SD12 Subduction
being somewhat familiar with the engineering behind this particular edifice, that's not a radical concern
planet10 said:
being somewhat familiar with the engineering behind this particular edifice, that's not a radical concern
Re: Re: Re: CSS SD12 Subduction
Sorry for the bad drawing, it was intended to show were to place the drivers.
I have these two FW208N around (bought for another project gone bad) and wondering if they would work in your CSS SD12 Subduction.
Can you help?
planet10 said:
Sorry for the bad drawing, it was intended to show were to place the drivers.
I have these two FW208N around (bought for another project gone bad) and wondering if they would work in your CSS SD12 Subduction.
Can you help?
Yes, I'll have a check when I get a minute. Ditto the TB design. Both will need a cabinet re-design, but there's no reason why a good bass-pipe-horn couldn't be done for either of them.
Greg -now that 16Hz job sounds impressive...
Greg -now that 16Hz job sounds impressive...
Thanks,
FW208N has low Fs for a 8"
Fs: 29Hz
Re: 5.8 ohm
Qms: 13
Qts: 0.2
Qes: 0.21
Vas: 43.423 L
Xmax: 6.5mm (0.256 lb)
FW208N has low Fs for a 8"
Fs: 29Hz
Re: 5.8 ohm
Qms: 13
Qts: 0.2
Qes: 0.21
Vas: 43.423 L
Xmax: 6.5mm (0.256 lb)
planet10 said:
Greets!
Long n' skinny:
L = ~240.438"
Sm = ~51.842"^2 (recommend ~6.055" W x ~8.562" D)
zdriver = ~52.175"
A-B-C = ~4.281"
Dimensions are approximate, so you can round them up as required. For basic layout: http://www.zillaspeak.com/bib-howtobuild.asp The sim shows no stuffing, so they perform much better in-room than the sim indicates once damped to suit.
GM
Attachments
Sorry but i dont get the topic on this thread?
What is it about?
And where is it now?
🙂
Solve
What is it about?
And where is it now?
🙂
Solve
Solve said:
It's sort of like coming into a reading of Proust or War and Peace.
This monumental thread is dedicated to the BIB speaker design.
The best summary is the godzilla site which has some images.
What you see most recently here is some calculations for specific drivers....
But I thought I've seen your name on here before (?)
How to build a BIB info:
http://www.zillaspeak.com/bib-howtobuild.asp
Re: Re: Re: Re: Re: CSS SD12 Subduction
Hi,
do you mean I can go with the design here http://homepage.mac.com/tlinespeakers/FAL/box-plans/CSS-SD12-BIB-1v0.pdf or I need adjustements?
GM said:
Hi,
do you mean I can go with the design here http://homepage.mac.com/tlinespeakers/FAL/box-plans/CSS-SD12-BIB-1v0.pdf or I need adjustements?
loninappleton said:
Yes thomaseliot i have been here before but still dont manage
to read all 3126 posts thats why i asking where it is now.
🙂
Solve
Solve said:
Firefox just snapped my bean and killed my post on this so here goes again:
There's the basic BIB and then some teaks and mods have been added:
The iBIBk which has it's own thread is an inverted BIB with Karlson cutout.
The suprabaffle added is shown in the godzilla site.
And a tweak I am using successfully is a pennant-shaped piece of felt as a divider down the mouth to tame boominess. The pennant shape follows the taper of the mouth . This was not original. It came from a suggestion-- or interpretation of a suggestion -- by GM.
tobebu02 said:
Greets!
Sure, it's what we're here for.......
'zdriver' is normally a fixed value, L*0.217, but is somewhat flexible to keep the driver somewhere around ear height.
'L' is typically a function of Fs, 13560"/Fs/2, which tunes it ~an octave below Fs, but this too is flexible to keep the folded height reasonable when using low Fs drivers.
'Sm' is derived from the net Vb required based on a complex function of the driver's Vas, Qts. Reducing this lowers LF gain BW, which I don't recommend as it limits your tuning flexibility, though some cabs are so large it's unavoidable to either fit in the room and/or keep peace in the family.
An example:
L = 13464.54/2/70 = 96.175"
folded height = 96.175"/2 = 48.09"
Vb = 20*0.29*0.445^1.25 = 2.10804 ft^3
Sm = 2.10804*1728/96.175 = 75.751"^2
depth = SQRT((75.751*SQRT(2)) = 10.35"
width = 75.751/10.35 = 7.319"
zdriver = 96.175*0.217 = 20.87"
a-b-c = 10.35/2 = 5.175"
GM