Planar Speaker Asylum

Welcome! Need support, you got it. Or share your ideas and experiences.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: Apogees and ethics - comments

Posted by josh358 on February 7, 2012 at 20:14:55:
I read somewhere that the torsioning is caused by air leakage at the sides of the diaphragm, I assume that creates eddy currents which lead to chaotic behavior. I know from the Apogee patent that they varied the pitch of the corrugations to maintain more stiffness. I'm wondering if there isn't a way to maintain laminar flow at high velocities, or, barring that, to better damp the oscillations electrically. Or what about using two 1" ribbons in a single magnet assembly, separated by a thin divider, rather than one 2" one? I gather narrower ribbons are less subject to torsioning. Each ribbon would be in a laterally asymmetric B field, but you can apparently get pretty good field uniformity with finite element analysis.

Or maybe Graz fixed the problem after all. :-)