Planar Speaker Asylum

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RE: total speculation. nt

Posted by pictureguy on August 25, 2010 at 19:56:18:
Let me see if I've got this straight........
You have a theory and I have speculation?

My long gone Dual 1209 TT had a 2 piece platter, Pretty dead when given the thump test.
Each half would individually ring pretty good.

Also, as the mass of something goes up, the resonant frequency drops, in general. My theory calls for a light, rigid, one-piece frame. No metal bridgework, either, and all fasteners will be either SS or Brass. Maybe Brass, preferred.

As for bridgework stand designs, I'd be tempted to TRY thin-wall tubing. Fabricate Wooden plugs with threaded inserts to interface with other parts. It's not like the stand is under much stress. I'd also test Aluminum tubing. While I dislike Aluminum for personal reasons, that it is so 'dull', having no fatigue strength and responding poorly to elongation and some other things, at least, as the reasoning goes, You've never seen an Aluminum Bell.

The panel....for the 1.6, anyway has an impedance peak at 600hz. I'll look at the rest of the data and see if a resonance exists. Total frame would ideally be tuned to 'suck out' that frequency and flatten output. Just thinking in print.

It is just my opinion, for now, that the lightest frame of the single sided variety will have good characteristics. I am working on a way to NOT use screws to hold the driver to the frame since I don't want to drill holes in it.

When I have everything taken apart, I'll 'feel around' and try to determine just how much additional sound is produced by other parts of the panel. If everything is a rigid unit, however, the vibes should be 'grounded'. A driver, secured to a low mass frame should have minimal impedance mis-match. I hope.