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In Reply to: RE: Diffusison posted by josh358 on October 02, 2016 at 19:14:55
There is nearly a foot's worth of MDF you can remove from each speaker by going to a hardwood frame. Also benefit from putting the mid and ribbon closer. Perhaps that is the way to fit the speakers into the room in the equidistant setup. Despite many trials on other setups that is pretty much the go-to for all performance criteria even when the crossover is not quite friendly to it. As Vandersteen and Theil point out there is something fundamentally right about physically time aligned designs that does not quite happen without it.
Follow Ups:
Isn't frame width related to front/back cancelation frequency?
Too much is never enough
Yes, but less important when you are using wall loading as Josh is doing as dipole cancellation is restricted on one side. .
I'm just establishing the principle. And Yes, with the panel using wall loading, that side is pretty much 'out of play'.
The reason I ask is that I've seen Panels with 'truncated' frames (Apogee?) which I suspect varies the cancelation frequency. Advantage? Disadvantage?
I would design such frames for my 1.6s, if I ever work up the energy to start!
Too much is never enough
The trapezoid shaped frame on the Apogee is supposed to spread the baffle loading over a broader range of frequencies rather than have the one freq below which it just falls off.. Other issues are at play but I don't remember what they were. That should complement the room's bass loading and provide a more uniform bass FR - it is sort of a substitute for Magnepan's resonance freq tuning with the buttons. but operates at a different freq range to provide a lower bass emphasis vs more even response on through the midbass on maggies.
I don't expect it would contribute to a maggie reframing project. .
The equidistant setup certainly works sonically but it destroys the room, almost bisects it and blocks a window. I'm going to try it further back -- I'd tried it at 3' which as you might expect was terrible (easy to do because that's where the woofers were at the time) but not at 4' or 6', only at 5', and not with diffusion. I'm thinking that 3' or 4' might work with diffusion and that becomes practical.
New wood NT panels would be nice and it would be great to put the mids and tweeters closer together. (BTW, anyone know what the trim strip between the mid and tweeter in the 3.x and 20.x does? Is it there for structural reasons?) However, another big project I don't have time for, busy today installing the fireplace and I haven't even fixed the delam on the woofers.
Whatever I do, it will ultimately be time aligned with the MiniDSP, I don't see any way of getting this room to work without that.
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