The carpenter says he is very impressed how dead / non-resonant the constrained layer damping makes the mdf, when knocking on them.
The carpenter says he is very impressed how dead / non-resonant the constrained layer damping makes the mdf, when knocking on them.
Some progress.
Theory and practice.
That's super cool!!!
Barry.
If we knew what the hell we were doing, we wouldn't call it research would we.
The LF-boxes are finished now and painted! I will fetch them at the carpenter next week.
HF-boxes for the horns will be built next.
interesting build
you should replicate a Wood horn and not a plastic one
engage your 3D and CNC skills!
I should engage my molding skills. I want the horn in concrete like K2 S9500.
WOW!!! nice project!
Some delay at the painter, but now the LF-boxes are painted. Will fetch them this coming Saturday.
Looks great!
But the boxes looks small for 1501FE? No vents?
It is ~50L net volume closed boxes that will be around 80% filled with damping, and have linkwitz-transform-ish digital correction (in conjunction with the room and corner gain).
Dual woofers per speaker, and most likely placed with significant corner and room gain.
~50L is also the kind of optimal theoretical box-size according to Ruedinger in this thread, with regard to suitable Thiele alignements for 1501fe. So I can add ports later. But it is not very likely. More likely they will have to serve as closed corner-subs, if this project do not work out for some reason. JBL TiK-sub works niceley closed with this size box.
Another option might also be to add a third and fourth woofer/box per speaker, hahaha
When I simulated closed box for 1501fe, box sixe 40L, 50L or 60L did not make a large difference, for the SPL-curve at least.
Basically, I choosed dual woofers in closed boxes over single woofer in larger ported box. My main design constraint is currently the allowed total speaker size. But with this modular approach my solution is scalable for the future.
Not visible, but there are magnets inside the front baffle, for the speaker grille.
The eagles has landed!
Now waiting for the horn-boxes.
More pics.
The boxes are filled to approx 70% with a combination of sheep-wool based dampingmaterial and bed-mattress foam (do not know correct english word).
Those look great and well integrated!
I bet you already started listening without horns
Is that mattress foam you are using of open-cell type ?
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