Enclosure designs for Burro Speakers

[brsanko]

Modeling 2 corner loaded (ang=0.5 x Pi) enclosers at 100W and 5mm gives 128db @ 50hz and 122db @ 40hz. That is loud and deep and clean!! The impulse looks good too.

[freddi]

nice sketchup - - does the driver mount on the front face? what's your cabinet plan look like and about how much plywood would it take per cab? I'd figure the little karlson 12 goes to maybe 70 with BetsyK half-space and fried her before getting very far into listening - loud and cone didn't move but too much heating Seems to me Qts would raise as the coil moves out of its linear range plus modulation effects get worse when the cone is traveling

[brsanko]

Here's a pic with the side removed. I haven't figured out how much material or drawn up detailed plans yet I thought I'd see how much interest there was first. Especially since I don't have the cash to build them myself right now.

[freddi]

what does hornresp predict when you drop in FE206EN instead of BetsyK?

[brsanko]

They are very different drivers it probably wouldn't look good at all but I could just as easily design one for the Fostex as well. I have about an hour and a half into that design so I could very easily do a similar one for the Fostex. Just let me know what your priorities are i.e. size vs. frequency extension vs. efficiency, or simplicity vs. appearence, etc. Do you prefer an ornate round design or a square simple design.

[freddi]

"square" and as simple as possible - -- - thanks

[brsanko]

Huh! Weird I messed around with the FE206En and came up with a design so close to this one it was uncanny. The really surprising thing is how small the performance difference is between the two drivers. Makes me wonder if the Fostex is worth the money. The optimum design was different and I haven't drawn it up yet(I'll probably do it tomorrow) but it actually would do quite well in the enclosure as is. The graph on the left is the horn optimized for the Fostex and the one on the right is the Fostex in the Betsy K horn. Of Course the one for the Fostex is actually smaller so it would make more sense to build that one if you want the Fostex speakers.

[freddi]

I didn't run BetsyK much but my impression was FE206EN was hotter on top - - your Fostex horn looks good in hornresp - what would be its external bulk?

here's the old 206E in BK20 sim - I like 12" Karlson with 8" drivers better than my BK20 as to me there's a spatial and maybe "time" discontinuity between the horn mouth output and the cone

[brsanko]

Well it's about 15% smaller than the Betsy K horn, so I'd probably take a few inches off depth otherwise it will look about the same.

[freddi]

what happens in hornresp when you put BetsyK parameters into the Fostex design? (Fostex with Fostex looks very good for cello, etc assuming hornresp pins it)