Belt drive is a lot quieter than direct drive. But, RPM is a key factor and didn't find the RPM spec on the compressor direct website. That compressor looks like an Asian built Quincy branded unit. The head looks like it could take 2HP to 5PH. With the lower HP motor they would run the pump slower and with a bigger motor they would run it faster. If true then it's probably pretty quiet.
I'd say get the RPM spec. and compare to other competitive models
I have an old Quincy model 325 pump that can run either 3HP at or 5HP at twice the speed. I put a 3HP motor on and run it slow to be quiet. I think mine is 450 RPM now or it would be 900 RPM with the 5HP motor which would make twice the CFM but with more noise.
Joe Jensen | VP Internet of Things Group | GM Retail Solutions Div.
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Joe Jensen