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Thanks Nicolas, is the original sound then also tuned for improved propagation under water? None of my Memovoxe's ring like the DSA, and some are from the same period. I am sure that I read some JMC publications talking about this difference between the waves in the air and under water. Could it be

Dear Dje, hello from Belgium. I am also the proud owner of a Deep Sea, but do not have your picturing talents. I had an argument on a french forum about the ringing frequency of the alarm. It, indeed, sounds completely differently than my Memovox and definately differently from my Réveil. I read som