How much louder is the Supervan 900 than the stock PT6 powered Caravan?

The Honeywell engine is definitely louder on the ground than the PT6 (probably twice as loud) at idle. During takeoff, climb-out, and cruise, the Honeywell engine is quieter than the PT6 by at least 3 dB( A) as compared to the PT6A-114A with 106” 3-blade McCauley. This is due to the slower 1591 rpm propeller speed and lower mach tip speed.

See City of Juneau, AK. Noise test for Otter comparison of similar engines. More.

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