[CQ-Contest] Re: Heil vs. KOSS

Mike no6x at inreach.com
Wed May 13 08:15:09 EDT 1998

>According to the Radio Shack 1998 catalog, the Optimus PRO-50MX
>response is 20-20,000Hz.

The paper work with my Pro-50MX says 10-22000Hz


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