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mfj speech intelligibility enhancer makes barely understandable ... shows that nearly half the speech intelligibility is contained in 1000 to 4000 hz range ... on the other hand the low frequencies 125 to 500 hz have most of the speech ... 55 but contribute very little to intelligibility only 4 to dramatically improve your ... speech you must first drastically increase the speech energy above 500 hz where 83 ... of the speech intelligibility is concen-trated second drastically reduce ... below 500 hz where only 4 of speech intelligibility lies the mfj616 splits the audio speech ... band into four overlapping octave ranges centered ... become highly understandable even if you don t have high frequency hearing ...