The cause of the loud, high pitched noise is definitely from the power supply.
Here's a photo of the power supply from the TS-h886 running:
Here's the noise floor with the power supply off:
When powered on, the difference in actual fan noise and whine is immediately apparent. This is not the power supply shipped in early preview units which seemed to be much quieter.
The only fix for the noise issue is to replace the fan inside the factory power supply with a better Noctua fan or replace the power supply with a PC SFX power supply with a quiet / silent fan. Both of these options would void the warranty but there are few choices for dealing with this awful noise if the NAS is in the same room with you. Best of luck to everyone who finds an acceptable solution to the annoying fan noise.
Noisy TS-h886 PSU Fan
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Re: Noisy TS-h886 PSU Fan
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