Quote Originally Posted by lnuss View Post
By searching for "icom aviation headset adapter" (without the quotes) you can find an adapter designed to take care of the aviation vs non-aviation level/impedance problems when using your David Clarks, etc. Amazon, Sporty's, Aircraft Spruce and others carry them. I use one with my Icom A-21 and David Clarks and it works great.
I looked at several of the ads that came up, and saw no mention of impedance matching. Can you point me to an ad that does?

The transformers that I've used for impedance matching are about the size of a large sugar cube...all the adaptors I saw didn't seem to have room for one, internally. The companies could have custom transformers made, but that would be a pretty small production run.

Ron Wanttaja