Hard hat communication system

A hard hat, comprising:

• a rigid outer shell without a lining, the rigid outer shell dimensioned to cover a human head and supported away from the head by one or more suspension bands;
• a vibration transducer secured to the exterior of the rigid outer shell, the vibration transducer operative to vibrate the rigid outer shell when active without contacting the head;
• a control system coupled to the hard hat below the perimeter of the outer shell, the control system further operably coupled to the vibration transducer such that the control system controls vibration of the vibration transducer, the control system comprising at least a power supply for the transducer and a signal receiver,
• wherein the control system converts received audio communication at the signal receiver into a signal sent to the vibration transducer such that activation of the vibration transducer results in direct vibration of the rigid outer shell without any direct vibration of the head, with the combination of the transducer and rigid outer shell creating a harmonic resonance acoustic chamber replicating the received audio communication.