I don't have the A20's, but I have the A10's.  The hinge at the top of the A10's (A20's are the same) headband has been a problem in my IV-P due to minimal headroom.  

I have pounded the overhead console on many occasion in light to moderate turbulence.  Yesterday, I traded for Zulu 2's.  One of the reasons was the increased headroom I get with the design.

Craig Gainza

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To: lml@lancaironline.net
Date: Thu, 28 Jul 2011 07:49:05 -0400
From: colyncase@earthlink.net
Subject: [LML] Re: New Bose and Pressurization ?

going back to the beginning of this thread:   Has anyone else had problems with the Bose A20....of any sort?

On Jul 22, 2011, at 8:17 AM, RONALD STEVENS wrote:

Hello guys

Today I was training again (with Bob Jeffrey) with my new 4p and noticed that I had a lot of static noise in my new Bose headset (the new X), and was wondering if you had the same? (I have an old Bose also and this one works ok).

We played with the pressurization and we noticed that it did react on it.…..anybody having the same ?

Thanks — Ronald

Ps Lancair 4p, 7 hours and counting, using 3 different CFII's lol ;)~