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The term “Heavy Duty” when referring to flashers typically means being able to operate more lamps and higher currents.

      Examples:

           554 & 557: 10 lamp (21 Amp) Standard flasher

           570 & 571: 12 lamp (25.2 Amp) Standard flasher

           573 & 574: 16 lamp (44.6 Amp) Heavy Duty flasher

           576 & 577: 20 lamp (45 Amp) Heavy Duty flasher 

All of these flashers do generate a sound when they operate because of the sound the internal electromechanical relay makes when the relay contact close. The intensity or decibel (db) sound level of the noise that these flashers make has not specified, quantified or defined.

An all solid state flasher like the PM 5000 flasher operates without generating any sound or noise.

 I have seen some flasher data sheets from companies like Hella that do list a sound level specification for some of their flashers. The PM flashers are not rated with this type of specification.