Underwater Earphone - Research and Development - Acentech As part of an SBIR Phase II project to develop novel applications for advanced transducer materials, Acentech developed an in-ear earphone for underwater communications for scuba divers. The goal was to replace standard diver communications receivers consisting of about a cubic inch of piezoelectric material embedded in a plastic casing and worn on the top of a dive mask. These are somewhat bulky, and they also radiate sound away from the diver which can limit their use during operations requiring diver stealth. Acentech’s approach began with a previous design we had developed for a high output driver employing highly innovative single-crystal PMN-PT bimorphs for an active noise reduction earplug for Air Force and Navy personnel on

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