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The H2dM hydrophone is designed to offer great sensitivity and low self noise in the human

auditory range while being rugged, compact and affordable. Its small, streamlined shape and high specific

gravity will help maintain a low working depth in mild wind and currents. Its compact size and flexible cable

make it very portable and simple to use. It will interface directly with compact digital recorders and other

devices with mic preamps designed for electret-condenser microphones with 3.5mm input.

Using the H2dM

The H2dM is terminated with a 3.5mm TRS plug and wired for dual-mono output (output wired to

both tip and ring; sleeve contact to ground). The most common application is driving a compact stereo

digital recorder. This output configuration will also work with nearly all video cameras and computer sound

interfaces

with 3.5mm mic input. Plug-in power (PIP) is required and may need to be switched on in

your device. When recording with only one hydrophone, direct connection is made to the recorder and

both left and right channels will record the same information. If wanting to record true stereo sound with

two hydrophones, an adapter is typically needed that breaks out the left and right channels of the recorder

into separate input jacks.

Please note that the 3.5mm jack is used for many kinds of audio connections. The H2dM will

only work with microphone inputs. The hydrophone plug will fit into auxiliary inputs on powered

speakers or marine stereo systems, but these will not provide PIP to the signal conditioning board in the

H2dM, nor will they provide adequate gain. This connector is also used with headphone outputs. Also see

footnote 1 below. Do not make the assumption that, if the plug fits, the system will work.

Hydrophone care

No special care is required for the H2dM. It is designed to withstand corrosion from seawater and

the impact of accidental drops

handling to ensure the long-term stability of the product. It is best NOT to store the hydrophone in a

waterproof enclosure. Doing so will trap moisture, salts and minerals that are left on the hydrophone and

cable after deployment and prematurely corrode the output plug. Making an extra effort to coil the cable

neatly when retrieving the hydrophone will help avoid problems with tangles as the cable ages. Most

importantly, protect the cable from cuts and abrasions! The H2dM uses a custom-made cable with a very

durable PU jacket. However, it is also designed to be compact and flexible. Kinking the cable, walking on

it, or dragging it over a sharp or abrasive surface may damage the cable sheath and eventually cause the

hydrophone to fail. Both aquatic and terrestrial animals may attack the cable in an unattended application.

Using some kind of cable conduit, such as plastic tubing, can help protect the hydrophone in long-term

installations.

1 An adapter will be needed for most headset jacks (TRRS jacks that are designed to have a microphone contact

as well as headphone outputs). These are common on smart phones, tablets and laptop computers.

2 The H2dM uses a plate sensor on the end opposite the cable—somewhat like a microphone diaphragm. It is

extremely crush-resistant with radial loads, but may be damaged if dropped on its end. It is quite tough for what it

is, but note that it is a sensitive instrument. Avoid throwing it into the water, or any other activity that may result

with an impact to the hydrophone. One great advantage of this design is that it is easy to repair if necessary.

Contact Aquarian for support.

Aquarian Audio

H2dM Hydrophone User's Guide

. Try to keep the output plug clean and dry and avoid unnecessarily rough