How do I compare underwater speakers in a logical manner?
Look for a frequency response, output level, and depth rating that meets your specific minimum requirements from a reputable brand that does not exceed 30 volt international legal limit on the underwater speaker cable. A reputable company will always publish and provide impartial test data graphs on their underwater speaker(s), so that commercial and scientific customers can make an informed purchase. Unlike air speakers that are tested in air filled anechoic chambers, underwater speakers must always be tested in underwater acoustic test facilities (such as the US Navy’s Dodge Pond Acoustic Measurement Facility). For a nominal fee, the facility will measure the underwater speaker’s impedance (in ohms) vs. frequency, and the on/off axis frequency response vs. sound pressure level (SPL). If the underwater speaker manufacturer will not provide this data for you, then we would be pleased to arrange a test for you at cost of $1000. If you agree to allow us to publish the test data on our we
