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정용진,서두옥 제주대학교 1992 논문집 Vol.35 No.-
A underwater speaker was made by driver unit of usual speaker using acryl boards, polyester resin and the castor oil, and it was used to analyze frequency characteristics for lower frequency audiable pure sound in a water tank. A pure sound of which the frequency was from 300Hz to 500Hz was good frequency characteristics in a water tak experiment. But a pure sound which it were from 100Hz to 250Hz and from 600Hz to 1,000Hz were bad frequency characteristics. This underwater speaker make good use of sound fishing method which a shoal of fish are gathered, when it is broadcasted a audiable sound in underwater. This method is applied hair tail hand line fishing, squid hand line fishing, chub mackerel and japanese horse mackerel purse seine fishing, anchovy scoop net fishing in the coast of Cheju Island.