Why does my Monitor ST make that clicking sound? Can I turn it off?

You are hearing relays adjust the stepped attenuator inside the Monitor ST rack unit. This is a transparent, musical solution, as opposed to a VCA (voltage controlled amplification) which tends to smear the image and DCA (digitally controlled attenuation) where bit depth is degraded as the level is attenuated. It can’t be turned off, but if the sound bothers you the Monitor ST rack unit may be placed in a machine room or whisper rack, since the system may utilize up to 100 feet of Ethernet CAT 5e shielded cable.

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