Yes! That helps!
Here's something that still puzzles, though:
I'm thinking that the baffle should be centered between the inner rear and front baffle walls, which would mean at 9" for an 18" deep cabinet, right? So, is it 7 12/16" from the bottom of the cabinet and centered between the front and the back?
I know I'm asking a dumb one here, but you're collectively used to that, right?
Kofi
Here's something that still puzzles, though:
I'm thinking that the baffle should be centered between the inner rear and front baffle walls, which would mean at 9" for an 18" deep cabinet, right? So, is it 7 12/16" from the bottom of the cabinet and centered between the front and the back?
I know I'm asking a dumb one here, but you're collectively used to that, right?
Kofi
OK, run the 225 through the more recent T/S derived alignment Greg worked up, which optimises Vb for a given driver, and the results for one tuned to the driver's Fs are:
Total horn flare path length: 177in (for a cabinet 88.5in tall)
Internal width: 8.875in
Internal depth (including a 0.75in thick internal baffle) 12.5in
Zdriver = 38.5in
If you wanted to reduce the height for practical reasons (which will raise the tuning frequency by a few Hz, though it's still not exactly going to be lacking extension) then you could go with the one I suggested to Jeff, or fractionally taller:
Total horn flare path length: 140in (for a 70in tall cabinet)
Internal width = 10in
Internal depth (including a 0.75in thick internal baffle) = 14.125in
Zdriver = 30.25in.
Either of those would be my choice & are better optimised than the old one I did a couple of years back.
Total horn flare path length: 177in (for a cabinet 88.5in tall)
Internal width: 8.875in
Internal depth (including a 0.75in thick internal baffle) 12.5in
Zdriver = 38.5in
If you wanted to reduce the height for practical reasons (which will raise the tuning frequency by a few Hz, though it's still not exactly going to be lacking extension) then you could go with the one I suggested to Jeff, or fractionally taller:
Total horn flare path length: 140in (for a 70in tall cabinet)
Internal width = 10in
Internal depth (including a 0.75in thick internal baffle) = 14.125in
Zdriver = 30.25in.
Either of those would be my choice & are better optimised than the old one I did a couple of years back.
Yeah! Thanks!
Of course, some clarifications:
This is the "L" dimension in Greg's workbook, right? Being dumb, I'm not sure how to calculate the size of the slab 'o' wood I'd need as the internal baffle based on this.
So, does this mean with the .75" thick internal baffle out of the box the internal depth would be 13.25" or that I'd have to make the box 13.25" deep to accommodate a .75" thick internal baffle? I think it's the former, but I'm usually thinking wrong about these things.
I think it would be funny to put the 7.3-foot-tall BIB in a living room with 8-foot ceilings, but I wonder if the proximity of the ceiling would play havoc. Any ideas on that?
I'll try and draw up the new version in sketchup with measurements for approval later.
Thanks so much for all the help!
Kofi
Of course, some clarifications:
This is the "L" dimension in Greg's workbook, right? Being dumb, I'm not sure how to calculate the size of the slab 'o' wood I'd need as the internal baffle based on this.
So, does this mean with the .75" thick internal baffle out of the box the internal depth would be 13.25" or that I'd have to make the box 13.25" deep to accommodate a .75" thick internal baffle? I think it's the former, but I'm usually thinking wrong about these things.
I think it would be funny to put the 7.3-foot-tall BIB in a living room with 8-foot ceilings, but I wonder if the proximity of the ceiling would play havoc. Any ideas on that?
I'll try and draw up the new version in sketchup with measurements for approval later.
Thanks so much for all the help!
Kofi
You're welcome.
Well, the baffle terminates in the centre of the cabinet, as it always does, the same distance from the internal bottom as from the front & rear walls. So, to use the first 12.5in as an example, a little basic math gives 12.5in - 0.75in = 11.75in. 11.75in / 2 = 5.875in from the internal bottom of the enclosure & each face of the internal baffle from the internal front & rear walls.
Neither. It means that the total internal depth of the cabinet including a 0.75in thick internal baffle is 12.5in.
Yes. Don't try it. 😉 Use the shorter one. You'd likely overload the room with the taller & expansion will probably be thrown out of kilter.
Well, the baffle terminates in the centre of the cabinet, as it always does, the same distance from the internal bottom as from the front & rear walls. So, to use the first 12.5in as an example, a little basic math gives 12.5in - 0.75in = 11.75in. 11.75in / 2 = 5.875in from the internal bottom of the enclosure & each face of the internal baffle from the internal front & rear walls.
Neither. It means that the total internal depth of the cabinet including a 0.75in thick internal baffle is 12.5in.
Yes. Don't try it. 😉 Use the shorter one. You'd likely overload the room with the taller & expansion will probably be thrown out of kilter.
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