Hydrophone Manufacturers

The following is a compilation of hydrophone manufacturers or providers.

MARMAM editors

Web-sites - compilations and reviews

ASA Bioacoustics site

(from - the National University of Singapore's Dolphin Study Group website..)

Utility-Grade Hydrophone Manufacturers:

BIOACOUSTICS, 3 noyes Avenue, Mattapoisett, MA 02739, USA. Phone: (508) 758-4270


CETACEAN RESEARCH TECHNOLOGY, Joseph R. Olson, 7309 26th Ave. NW, Seattle, WA 98117, USA. Tel: (206) 297 1310; Email:; URL:

DOLPHINEAR, Jackie Butler, Arretec, PB 3098 Bletchley, Milton Keynes MK2 2AD, UNITED KINGDOM; U.S. TEL/FAX 1-415-704-3134 (San Francisco); International: FAX: +44 20 7681 3734 -or- +1-415-704-3134; Email:

OFFSHORE ACOUSTICS, 5454 Indian River Drive, North Vancouver, B.C., Canada V7G IL3; Phone: (604) 929 0440; Fax: (604) 929 0440; Email:

SENSOR TECHNOLOGIES, P. O. Box 97, Collingwood, Ontario, Canada L9Y 3Z4. Phone: (705) 444 1440; Fax: (705) 444 6787

SONATECH, Inc., 879 Ward Drive, Santa Barbara, CA 93111-2920, USA. Phone: (805) 683 1431 ext. 353; Fax: (805) 683 4862; Email:

SPECIALTY ENGINEERING, 3155 North Porter St., Soquel, CA 95073-2217 USA. Phone: (408) 465 9000; Fax: (408) 465 9001; Email:; URL:

VEMCO, 100 Osprey Drive, Shad Bay, Nova Scotia, Canada B3T 2C1; Phone: (902) 852 3047; Fax: (902) 852 4000; E-mail:; URL:

Professional hydrophone manufacturers:

BENTHOS, 49, Edgerton Drive, North Falmouth, MA 02556-2826, USA. Phone: (508) 563 1000 / 1 800 446 1222; Fax: (508) 563-6444. Email:; URL:

BRUEL & KJAER Head-office: Brel & Kjr Danmark A/S, Skodsborgvej 307, DK-2850 Nrum; Phone: +45 4580 0500; Fax: +45 4580 1405; Email: URL:; USA: Phone: 1 800 332 2040; Fax: (770) 808 7818; E-mail:;

EDO ACOUSTIC PRODUCTS, 2645 South 300 West, Salt Lake City, Utah 84115-2968, USA. Phone: (801) 486 7481; Fax: (801) 484 3301; E-Mail:; URL:

ENGINEERING ACOUSTICS, Engineering Acoustics, Inc., 1490 Gene Street, Winter Park, FL 32789, USA; Phone: (407) 645 5444; Fax: (407) 645 4910; E-mail:; URL:

GEC MARCONI, Faraday Park, Railway Road, Meadowbank NSW, 2114 Australia Sonar and Underwater Division Sensors Unit, Phone: 612 809 9777; Fax: 612 809 9751; Email:

GEO SPACE, 7334 N. Gessner, Houston, Texas 77040, USA. Phone: (713) 939 7093; Fax: (713) 937 8012; Email:

GRAS, Scan Tec: Phone: (301) 495 7738; Fax: (301) 495 7739

HIGH TECH, INC., 1390 29th Avenue, Gulfport, Mississippi 39501, Phone: (601) 868-6632; Fax: (601) 868-6645; Email:

ITC, 869 Ward Drive, Santa Barbara, California 93111, USA. Phone: (805) 683 2575; Fax: (805) 967 8199

RESON, Reson, Inc., 601, Firestone Road, Goleta, CA 93117, USA. Phone: (805) 964 6260; Fax: (805) 964 7537; E-mail:; URL:

SONIC TECHNOLOGIES, 2935 Byberry Rd., Hatboro, Pa. 19040, USA. Phone: (215) 957 2352 / 1 800 761 2828; Fax: (215) 957 2355 E-Mail:; URL:

USRD (Underwater Sound Reference Division), These standard hydrophones are available for a service fee (rent) form the Underwater Sound Reference Division (USRD) of the Naval Undersea Warfare Center (NUWC) which has been relocated from Orlando, Florida to Newport, Rhode Island. These hydrophones may seem to be expensive but they will be recalibrated annually and replaced should they fail or be inadvertedly damaged during the length of the service fee agreement. Also, if you need a hydrophone in a hurry, USRD can usually supply one within a week. If you intend to publish quantitative acoustic data in a refereed journal, these hydrophones provide an excellent link in the traceability of your measurements to the National Institute of Science and Technology (NIST). Phone: (401) 841 43 36 Fax: (401) 841 49 89 Email:

The following are some comments from MARMAM subscribers:


..You may notice that I've added a new hydrophone (model C20b). It is 4dB more sensitive than the C20a and has a bandwidth of 22kHz. This model, with additional headphone driver, will soon be available in retail marine supply stores. The price should be in the US$425 range.

As demands on my time increase with more hydrophone orders, I have less time to work at my consulting job. Earnings from consulting have subsidized the cost of building hydrophones. Consequently, the hydrophone prices will increase slightly beginning 1 November 1997. Nonetheless, I will continue to offer discounts to research, educational, and nonprofit organizations. The only exception could be with the "C20b with headphone driver." It will be considered a recreational hydrophone (though still well suited for research) and go by some catchy trade name. I need to keep the retail dealers happy.

Thanks again for all of your encouragement. Please contact me if you have any questions or comments. I will reply to all messages when I return home from my honeymoon on 24 September!

Best wishes to all, Joe

Date: Thu, 5 Jun 1997 17:27:17 -0700

From: Harald Jurk

Due to a number of requests for affordable hydrophones that are suitable for fieldwork I thought I post the information about the hydrophones we use for killer whale research. The hydrophones are build by Berverly Ford's one person company called Offshore Acoustics.

The information posted is taken from the company's brochure: Offshore Acoustics hydrophones offer high performance, field durability, and low cost. Their broad frequency response and high sensitivity make them well suited for a wide range of underwater monitoring applications, from basic listening with an amplified loudspeaker to recording using audio cassette, DAT, or video cam-corders. Standard hydrophones come with 10 meters of rubber-encased coaxial cable, which is optimal for use from a drifting boat. Longer cable lengths for use in fixed shore-based systems are also available. Each hydrophone is supplied with a plastic power supply box (12 x 6.5 x 3.5 cm) containing a 9 volt battery that drives the hydrophoneUs internal preamplifier. This is fitted with a standard 3.5 mm mini-plug for connection of the unit to an amplified speaker or recorder.

An instruction and maintenance sheet is included. Delivery time is 4-6 weeks. Each hydrophone comes with a one year replacement warranty (cable damage excluded).

You can send a Fax to Beverly Ford. Her Fax number is (604) 929-0440, or you can send a regular letter to 5454 Indian River Drive, North Vancouver, B.C., Canada V7G 1L3. You also could get in touch with her by e-mail. The address is

From: (Dani Zbinden)

A manufacturer who builds affordable high-quality hydrophones is Sonatech, Inc.

Wide band hydrophone model 8178: Piezoceramic spherical sensor with a preamplifier on a 75 foot waterblocked cable.

A different hydrophone from Sonatech, model 8185, goes to about 45kHz with a very uniform frequency response. However, this hydrophone picks up every movement of its cable, so is awkward to use in conditions other than flat calm.The high-frequency hydrophone (model 8178), while its response is a bit more lumpy, is much more usable since it is very resistant to acceleration noise. This wide-band hydrophone is also available in a towed body shape or in a full ocean depth capable configuration.

The cable is a neoprene jacketed water blocked twisted shielded pair and can be anything from 20 to 350 feet. Cable length above 75 feet requires a line driver power amplifier and will increase the costs of the hydrophone. Don will tailor the hydrophone to your particular needs without including any design or tooling costs. In addition, he will recalibrate the unit periodically for the cost of freight and provide calibration data about receiving sensitivity and beam patterns.

From: (Don Norris)

BIOMON in Santa Barbara, CA. will tailor hydrophones for a specific need without non recurring engineering charges and for a low overall cost on the unit. Additionally, BIOMON will consult on the net for free or for short periods of time on the phone or FAX for free. These hydrophones include towed wideband and narrowband hydrophones, overside or suspended hydrophones, hull mounted hydrophones, hydrophones for further mounting, directional hydrophones, some line arrays, and projectors. Biomon address is:

BIOMON, 718 C West Victoria Street, Santa Barbara, CA. 93101. Phone: (805) 683-1431 EXT 353; email:


Subject: Re:DolphinEar Hydrophone Systems

DolphinEar is a $150 hydrophone system suitable for research, educational or recreational use. It's a complete system with hydrophone, quality cable, amplifier and wide frequency response earphones. Also included is free software for displaying audio spectrograms on PC's.

DolphinEar can be deployed in 60 seconds making it ideal for a 'quick listen' in acoustically active areas - or for sustained monitoring. Sensitivity is excellent - but the frequency response is limited to normal human hearing range of 18 Hz - 20,000 Hz although it will work well beyond these limits.

DolphinEar was first introduced in 1998 to introduce the general public to the world of underwater sounds as a way of building an appreciation of the life that exists in the oceans of the world. It was designed to be rugged and simple to use.

DolphinEar quickly found a ready audience in the research world and is currently in use by university researchers, US government agencies, Fisheries Departments around the world, NATO, whale-watch boat operators, recreational boaters, secondary educational institutions, and commercial laboratories.

The complete package is available from stock, ready for immediate shipment to anywhere in the world.

For further information:

Contact Jackie Butler Email address:

Price: $159 US (6m), $199 (12m), $265 (20m) + delivery

* Note: frequency response is given for entire system including earphones. This limits the frequency response to normal human ranges. When using the supplied software for recording sounds directly from the DolphinEar, the useful low frequency range extends down to under 10 Hz; the upper frequency range extends to more than 22 KHz.

Return to Main MARMAM page

Return to The Whitehead Lab

Last Updated July 2000 by Sascha Hooker