A loudspeaker system of only 0.025 m/3 internal volume capable of radiating an acoustic power in excess of 1/16 W at 32.7 Hz in pairs is described. Each complete system consists of the loudspeaker in its enclosure together with a complementary filter of the type described by Thiele as his alignment 15. Unusual features include a vent substitute appreciably larger than the main radiator.
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