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header_M18_hydrophone
m18-25_product_shot_250x190The M18 family of products from GeoSpectrum Technologies are high-power spherical transducers with resonances ranging from 135 kHz to 12 kHz. Diameters range from 0.5” to 6.0”. Each member can be used either as a hydrophone or as a sound projector. The key features of a M18 are omni-directionality, even at high frequencies, and great depth capability.

As hydrophones, the M18s are relatively flat below resonance and fall off sharply above resonance. As projectors, the M18s have a Q of 3 to 4 and an electro-acoustic efficiency exceeding 80% at resonance.

If your need is for an omni-directional transducer at high frequencies, consider the M18.

The low-Q resonance makes the M18 ideal for underwater communications. Smaller M18s are perfect as broadband, high-frequency hydrophones.

If the M18 is to be used in a rugged environment, GeoSpectrum recommends its specially-designed, acoustically-transparent cage. Contact GeoSpectrum for more information.

Unless otherwise specified, all M18 units are supplied with 1 metre of cable.

Download each products’ specification sheet for more information or contact GeoSpectrum directly with your inquiries.

M18C-1.0


The smallest of the M18 product line at just 1″ (2.54 cm) diameter and weighing only 400 grams. The M18C-1.0 comes standard with a Subconn OM3M male, 3-pin connector. See the spec sheet for more detail.
icon_PDFDownload the M18C-1.0 Specification Sheet

M18C-1.5


This M18 has a diameter of 1.5″ (3.81 cm) and weighs only 100 grams. The M18C-1.5 comes standard with a Subconn OM3M male, 3-pin connector. See the spec sheet for additional details.
icon_PDFDownload the M18C-1.5 Specification Sheet

M18C-2.5


The M18C-2.5 has a diameter of 2.65″ (6.35 cm) and weighs 500 grams. The M18C-2.5 comes standard with a Subconn OM3M male, 3-pin connector. See the spec sheet for additional details.
icon_PDFDownload the M18C-2.5 Specification Sheet

M18C-4.0


The M18-4.0 has a diameter of 4.25″ (11.8 cm) and weighs 1,400 grams. The M18C-4.0 comes standard with a Subconn OM3M male, 3-pin connector. See the spec sheet for additional details.
icon_PDFDownload the M18C-4.0 Specification Sheet

M18C-6.0


The M18-6.0 has a diameter of 6.0″ (15.5 cm) and weighs 4,800 grams. The M18C-6.0 comes standard with a Subconn OM3M male, 3-pin connector. See the spec sheet for additional details.
icon_PDFDownload the M18C-6.0 Specification Sheet


Please contact us for further details or to discuss your specific needs.

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