Flex 6600M Input and Output Impedance Specifications

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I am in the process or integrating my new Flex 6600M into my ham shack.

I need to know the input and output impedances of the audio I/O to this radio to design the pads  between the radio and my somewhat sophisticated audio system.   Are these specifications already published or can they be made available?

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Geoff - W8GNM

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Posted 1 year ago

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Thomas NE7X

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Official Response
Microphone input is 600 ohms.  See the Spec tab on the FLEX-6400 product webpage.

  • Microphone Connector: Pseudo Balanced 1/8" TRS
  • Microphone Impedance: 600 Ohms Nominal (200-10kΩ)
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There is some info in the prelim hardware manual page 27 and 28:


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