Master Airscrew regular props (black) may be quiet, but this may be a result of the blade 'flattening' as RPM rises, reducing its pitch.
Actually it is quite because of its square tip. The TF Power Point props are also noisy because of the sharp tip. The flatening --Manually flattening out would actually increase noise as the engine picks up RPM. IMO the Zingers and MA wood props are the quietest .