Zoom Rooms running on Mac OS X version 10.12 (10.12.4, 10.12.5 or 10.12.6 beta 4) will sound distorted when using certain USB over CAT5 extensions, such as those from Gefen or Crefen, and a speakerphone, such as the Revolabs UC-500 or Jabra 810.

This article covers:

• How to troubleshoot audio with USB extenders
• Option 1: Change to 24 Bit Audio (For Revolabs Devices Only)
• Option 2: Utilize Mac OS X Version 10.11
• Option 3: Utilize USB Extenders not Impacted by the Issue

Prerequisites

• With Zoom extenders, you can zoom in and out

How to troubleshoot audio with USB extenders

Apple and the associated vendors are working closely with us to resolve this bug. When an update is available from Apple or the impacted vendors, this article will be updated. Following are the mitigation options available until an official fix is released.

Option 1: Change to 24 Bit Audio (For Revolabs Devices Only)

You may be able to solve the problem using the following procedure if you own a Revolabs UC-500 or other Revolabs product.

• You can find the Audio Midi Setup program in the Utilities folder of the Mac application list. Click on this to launch the program.
• On the left hand side of the screen, you will find a list of devices. Select Revolabs from the list.
• Choose the 24-bit format from the drop-down menu.

Option 2: Utilize Mac OS X Version 10.11

As far as we can tell, this problem does not affect Mac OS X 10.11 or earlier. As long as this issue is not resolved, you should not update to Mac OS X version 10.12.

Option 3: Utilize USB Extenders not Impacted by the Issue

This issue does not appear to affect the following USB extenders:

• USB 2.0 Ranger 2304 from Icron
• USB 3.0 Raven 3104 from Icron