It's the CX chassis. If you have the unit on the desk next to you, you cannot hear anything/anyone else. Just raging fans. No alarms or anything. Just noisy. And the speed never changes, just always on.
I called my dealer to ask them if it's meant to sound like it's going to take off and they told me "yeah I can hear ours when they're running. But you never know. We'd have to send someone out to look at it."
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