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In the Forum: Horn-Loaded Speakers
In the Thread: Adding one more spherical to Macondo.
Post Subject: A range of spacers?Posted by Paul S on: 8/10/2007
Well, once you get to machining it's expensive anyway, but you might re-use your old cover along with a series of simple shims and/or spacers of varying thicknesses/lengths, and use studs with nuts in lieu of bolts to retain the now-varying-thickness assembly. This would allow you to re-coup set-up costs by repeating the basic pattern with only its thickness/length as a change. This would also mean you have to change out the spacers each time to change volume, but it would at least keep the internal pressure +/- consistent (if not constant...) across the driver for any given volume. If you mean to put in a Schrader valve or threaded hollow bolt (light fixtures), they are available to mount into threads tapped into or a nut welded to a hole drilled through the cover. Of course the load would change with the temperature, ie, it would not be constant, nor linear, practically speaking. IF you use a valve to add air, it seems offhand like it might even play out that you get one "measured" pressure while adding air and another pressure a few seconds later, ie, there might be no practical way to "measure/repeat" it IF it is air you are adding.
Somehow it seems like it would be nice to have a fairly dense foam (like that horrible stuff from the can...) coating the "walls" of that chamber.
But then, I am the student here, and I am quite pleased to gravytrain.
Best regards,
Paul S Rerurn to Romy the Cat's Site