This paper deals with exploring the availability and reliability of subtraction techniques, based on spectrally dense signals such as maximum length sequences, in evaluating the echo reduction losses and transmitting properties of samples of interest in underwater acoustics. These techniques, first employed in air acoustics, were adapted to the underwater environment. Experimental results show how a measurement can be accomplished and the limitations produced by the actual available combination of soft, hardware and tank and samples dimensions. [The authors wish to acknowledge the help given by the CICYT, Project AMB97‐1175‐C03‐01, for allowing them to use the software, hardware, and related facilities in carrying out the work described by this paper.]
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