[TowerTalk] am-com clear speech addio filter

[Bills, Kenneth (K.J.)]

I have used the following product for over a year with no issues, it
provides a good deal of relief from the "ear burn" while operating
mobile. Also, it has a headphone jack output with DSP to silence the
XYL.

It is a bit pricey, but worth the money:
http://www.westmountainradio.com/CLRspkr.htm
73
Ken-W9KB