Recently, Zoom F8 and F4 users have encountered the following issue:
When certain XLR connectors are plugged directly into the F8 or F4, the connector cannot be removed by pushing the release button. This is due to the XLR connector's latch hole not being fully compliant with the IEC standard.
To avoid this problem, please insert an additional microphone cable with a Neutrik connector between the XLR connector and the F8's or F4's XLR jack.
About Zoom North America:
Zoom North America is the U.S. affiliate of the Zoom Corporation (Japan). The company prides itself on offering its customers the very highest level of service and support.