{HEAD ~ The second transducer} lies in {TAIL ~ the plane} of the input and output transducers of the parent application, but faces the ear canal cavity so that it detects the residual uncancelled noise present inside the ear canal cavity 
lies in
{ HEAD ~ The second transducer } lies in { TAIL ~ the plane } of the input and output transducers of the parent application , but faces the ear canal cavity so that it detects the residual uncancelled noise present inside the ear canal cavity
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH