Most of the sound is probably from the dry side. Since the dry side is outside of the tank, there's no water to dampen the motor sound. It's usually more noticeable on short pulse mode ramping up to 100%. In many cases, they will also quiet down after a few days 'break in' period. Also depends on what else around your system is generating noise. I really only hear mine in the evening after the lights (and associated fans) go out. But once they go into slower 'night' mode, things are pretty quiet.
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