Some big pison engines like the big Pratts have Harmonic dampers on the crankshaft to try and reduce the vibration in the affected range. And yes it is ANY engine/propellor/airframe combination fixed pitch or CS and tubine or piston. The big radials seem more prone because of the sheer mass changing direction every few seconds !
Also it is a combination in that you can see the restriction on one installation but the same engine or same propellor in another aircraft do not have the restriction.
