Acoustic Communication - GeoSpectrum Technologies Inc https://geospectrum.ca/product-tag/acoustic-communication/ Specialists in underwater acoustic transducers and systems Tue, 07 Jul 2026 13:19:26 +0000 en-US hourly 1 https://wordpress.org/?v=7.1.4 C-Bass https://geospectrum.ca/product/c-bass/ Thu, 20 Apr 2023 17:25:23 +0000 https://geospectrum.ca/?post_type=product&p=7307 GeoSpectrum’s C-BASS transducers are suitable for a wide variety of very low frequency (VLF) applications including use as calibration sources, active sonar acoustic surveillance, acoustic targets for sonar training and acoustic trials, acoustic communication with ranges exceeding 1,000 km, underwater navigation networks, acoustic thermometry, and diver deterrence. C-BASS also provides broadband coherent acoustic mimicry of anthropogenic noise (i.e. offshore wind, construction, pile driving, etc.)

C-BASS is a novel family of very low frequency (VLF) electrodynamic sound projectors. These powerful electrodynamic projectors are less expensive, lighter, smaller, more efficient, and have a broader bandwidth than their peers. C-BASS makes possible applications that were previously impractical.

GeoSpectrum offers a wide range of standard C-BASS configurations with operating frequencies ranging from below 10 Hz up to 3 kHz and maximum source levels that exceed 200 dB re 1 µPa @ 1m. Our finite element analysis and modeling tools and significant build experience enable us to customize C-Bass designs to customer specifications. The omni-directional C-BASS can be used individually or in arrays to produce high-power sources with or without directivity.

C-BASS are offered as stand-alone transducers for customer integration or as a GeoSpectrum-provided system that can include VLF amplifiers, pressure compensation, signal controllers, tow bodies, deployment cables, and winch systems.

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Model Number
Resonance Frequency
(Hz @ 20 m depth)
Maximum source level
(dB re μPa @ 1 m)
Max depth without compensation
(m)
Max depth with standard passive compensation
(m)
Max depth with standard active compensation
(m)
Diameter
(cm)
Mass
(kg)
Spec Sheet PDF Download
M72-25
25
197
N/A
10
230
118
402
M72-25
M72-30
35
201
N/A
10
340
102
355
M72-30
M72-50
53
190
N/A
20
600
68
157
M72-50
M72-110
115
190
30
200
900
35
24
M72-110
M72-300
300
190
80
500
1000
22
9
M72-300

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]]> FFR Free Flooded Rings https://geospectrum.ca/product/ffr-free-flooded-rings/ Thu, 06 Apr 2023 13:33:32 +0000 https://geospectrum.ca/?post_type=product&p=7256 Free Flooded Ring – FFR – transducers are broadband transducers with unlimited depth capability and a toroidal beam pattern. They are often used as an acoustic source in high-power applications and those requiring full ocean depth.

GeoSpectrum offers a wide range of FFR transducers and FFR based sources with operating frequencies ranging from 500 Hz to 20 kHz and source levels from 190 to 220 dB re 1 µPa @ 1m. Our finite element analysis and modeling tools and significant build experience enable to us to customize FFR designs to customer specifications. Depending on the application and requirements, Geospectrum can use radially poled and circumferentially poled (segmented) construction methods to produce FFR’s to precisely meet users’ needs with potential savings in cost and weight.

Using FFR technology to produce a standard range of communications transducers with a hemispherical beam pattern, the transducers are ideal for use in a range of underwater communications and acoustic modem applications. As well as producing models tuned to suit popular modem systems, we are able to offer drop-in replacement for transducer models of other companies that may no longer be available on the market.

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Model Number
Resonance frequency
TVR at resonance
Maximum SPL at resonance
Diameter / max section width
Height
Spec Sheet PDF Download
M27-450
4250 Hz
138 dB re 1 μPa/V @ 1 m
193 dB re 1 μPa @ 1m
18.4 cm
16.1 cm
M27-450
M27-550
530 Hz
135 dB re 1 μPa/V @ 1 m
191 dB re 1 μPa @ 1m
24.1 cm
82.5 cm
M27-550
M27-650
3050 Hz
137 dB re 1 μPa/V @ 1 m
193 dB re 1 μPa @ 1m
20.8 cm
20.8 cm
M27-650
M27-850
1850 Hz
138 dB re 1 μPa/V @ 1 m
194 dB re 1 μPa @ 1m
25 cm
24 cm
M27-850
M27-890
990 Hz
135 dB re 1 μPa/V @ 1 m
191 dB re 1 μPa @ 1m
32 cm
53 cm
M27-890

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