Additionally, the path of acoustic energy from a noise source, through the composite transducer, and to {HEAD ~ the ear canal} can be lengthened by {TAIL ~ the addition} of a baffle around which the acoustic energy must travel 
lengthened by
Additionally , the path of acoustic energy from a noise source , through the composite transducer , and to { HEAD ~ the ear canal } can be lengthened by { TAIL ~ the addition } of a baffle around which the acoustic energy must travel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH