Based on its in-house expertise in the vibration characteristics of piezoceramic materials and microacoustics, Sonitron developed the SPS-8770-UW, a flat piezoceramic speaker for underwater applications. This speaker is based on an advanced principle of piezoceramics and composite metal/polymer layer, with a composite membrane which reduces unwanted resonance peaks to provide a more even frequency response than can be achieved with conventional designs.
The speaker operates at voltages from 5 to 60 Vp-p over the frequency range from 600 Hz to 20 kHz and between temperatures of -20°C and +70°C. It weighs 60 grams and measures 87 mm x 90 mm x 10 mm, has a capacitance of 600 nF and an impedance at 1 kHz of 220 Ω.
Possible applications include diving communications, swimming pool music, underwater warning signals, boat alarms, outdoor applications, as well as applications inside refrigerators, whirlpools and bathrooms.
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