Among a variety of speech enhancement techniques, one subjective technique, called the Hollien binaural filtered (HBF) approach [Hollien, The Acoustics of Crime (Plenum, New York, 1990)], was proposed. It utilizes a special binaural hearing technique: The modified (usually filtered) speech signal is fed to the listener’s dominant ear at a relatively high level and a low-energy unprocessed speech signal is simultaneously sent to the contralateral ear. Unfortunately, there were no investigations related to the effectiveness of this technique of speech enhancement. In the present paper the results of the experiments performed in order to quantitatively evaluate this method are presented. The speech material consisted of nonsense word lists. For each measuring condition, one list containing 100 nonsense words was presented to five experienced listeners. Due to possible applications of the HBF technique in forensic phonetics, poor quality recordings were examined. The major difficulty in the experiments as to obtain the improvement of speech intelligibility by means of conventional speech enhancement techniques. When, however, such technique yielded an increase in speech intelligibility score (the largest increase was 5%), then the HBF technique provided further speech enhancement, the largest increase was 8% and 12%, respectively, in relation to modified and unprocessed speech.