Especially since he has the drivers, crossover and amps on hand now. What would he use as a stand for the mid and tweet?
Top down's the approach I take on a multi-way speaker - get the mid/tweet right then work out the bass to mid XO, but since all the parts are ready to go, lets see it.
I'm looking forward to the build thread.
Top down's the approach I take on a multi-way speaker - get the mid/tweet right then work out the bass to mid XO, but since all the parts are ready to go, lets see it.
I'm looking forward to the build thread.
In my most recent build, I know I had a lot of fun, challenges and satisfaction when the octagon boxes and their funky stands were completed, I am hoping Yoshy shares the build photos with us.
Has anyone ever built the ideal speaker
I doubt it
mine is certainly not
there are so many many details we could argue about, now and forever
tho, until its playing I have no idea what to expect of it
I suppose thats one exciting side of it
but I would be worried about a sagging woofer
I doubt it
mine is certainly not
there are so many many details we could argue about, now and forever
tho, until its playing I have no idea what to expect of it
I suppose thats one exciting side of it
but I would be worried about a sagging woofer
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I will share the building with you - It might be next year after Christmas; I just realized the parties starts this week-end.
About the sagging woofer... Yeah, I'll apply a DC offset 😀 I kid, I kid. How does the cheap HT subs do it ?
I'll read every reply carefully tonight. Might change a few things but maybe not the shape or most of the drivers.
About the sagging woofer... Yeah, I'll apply a DC offset 😀 I kid, I kid. How does the cheap HT subs do it ?
I'll read every reply carefully tonight. Might change a few things but maybe not the shape or most of the drivers.
Bob is the HiVi in the same league as the SEAS W15? I have heard the 16cm Mg cone and it was a really nice woofer. It lacked low end oomph (which is why it should be mated to a woofer like the W26) though.
why not a pentagonal core?
A bit of bracing and damping should resolve most renonace issues.
Yes I would to the XXLS has a heavy cone and a single spider (guessing).
Yoshy if you have already got the drivers there is little you can do but forge ahead. The W15 will need help in the lower midbass from a larger woofer (the W22 would have been a better bet but you already have the HiVi).
I am still a little apprehensive about the 12" woofer being placed face down/up though.
I've never used the Hi Vi driver, but over at HTguide, JonMarsh has had some pretty impressive results with it. It may not be quite up to the Excels, but still respectable.
A couple of designs using that driver:
HTGuide Forum - Arvo Pärt MkIII "Heavy Metal" Testing...
HTGuide Forum - M8ta - Fun or Work? ;-)
A couple of designs using that driver:
HTGuide Forum - Arvo Pärt MkIII "Heavy Metal" Testing...
HTGuide Forum - M8ta - Fun or Work? ;-)
What? Isnt a sphere near the best enlcosure shape for loudspeakers because it has no two parallel sides?
The cabinet shape issue is overblown. Unlike a listening room where you have problems getting enough depth of treatment, with an enclosure you can lightly fill the cabinet volume. This gets absorbtion in the center where velocity is high and pressure is low. This makes the stuffing very efficient.
As long as you use fiberglass rather than dacron or BAF (bonded acetate fiber) you won't have any problems with standing waves. These alternative materials are poor acoustic absorbers, in my experience.
The only cabinets I've had difficulty with are very long aspect ratio columns where I wanted a vented system with a low stuffing percentage. In that case an absorbtive barrier in the center of the cabinet (velocity maximum) did the trick. Non-vented cabinets should be lightly filled.
David S.
A sphere could be strongly resonant, if you drove it from the center, and if you had no stuffing!
It is one side with it's whole face visible from every spot on it's surface. In practical it's a regular lens or infinite number of lenses with the same focus distance and all focused in one point.
If you disregard the nuclear/fusion thing all other explanations apply to the behavior of an excited sphere. - http://www.glafreniere.com/sa_spherical.htm
Sounds like we need a few extra dimensions of space to manage that in a practical way.
That's cool, I am not sure how it applies, but it seems to me to support that a sphere is a bad idea for a speaker. Good for the baffle step, but the internal resonances will create some difficult nodes. I could be wrong though, so some one convince me otherwise.
As it is explained in the site I referred to, the amplitude in an excited sphere is always biggest at the center. So if there is absorbent material in the center it will be heated in the same way the stuffing in ordinary boxes is heated. That will transform the wave energy into heat energy and will solve the problem.
But sphere has another advantage - the amplitude of the waves is smallest at the perimeter, so the interference with the membrane would be less than any other enclosure even without stuffing.
As a matter of fact it would be less than the total internal area / speaker cutout area ratio as opposed to some rectangular enclosures which can get resonant "Q's" (if i may say it that way) near 1 🙂
But sphere has another advantage - the amplitude of the waves is smallest at the perimeter, so the interference with the membrane would be less than any other enclosure even without stuffing.
As a matter of fact it would be less than the total internal area / speaker cutout area ratio as opposed to some rectangular enclosures which can get resonant "Q's" (if i may say it that way) near 1 🙂
I agree. Damping a bracing should make this cabinet very useable.
I think we are digressing here. The cabinet size and shape are chosen and so are the drivers.
I think Yoshy was only doing a sanity check and in that respect the only apprehensions I had was the mounting of the woofers in a face/up down manner and that (though this argument is also mute since the drivers are chosen) maybe the SEAS W22 would have been a better fit than the HiVi 8a or that maybe a 3 way using a W18 might have been easier to build and tune.
Anyone see any other problem areas that cant be fixed easily?
I'd love to see Yoshy's final build.
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