Aquarian Audio Hydrophone - 3,5 mm Klinke 9 m Kabel

Aquarian Audio Hydrophone - 3.5mm TRS output (H2dM) 9 m Kabel

Used with compact digital recorders and other devices with mic preamps designed for electret-condenser microphones with 3.5mm input. These may include computers and computer sound interfaces (including tablets and smart phones), radio transceivers, video cameras and audio adapter boards for microcontrollers such as Raspberry Pi and Arduino. Plug-in power (PIP) is required and may need to be switched on in your device. Please note that adapters may be required for modern computers and that this type of connector is used for line-level inputs and headphone outputs as well. Check compatibility with your device. For more information and limited specifications, see H2dM User Guide.

How to specify custom cable lengths: Select the custom cable length option above, then buy hydrophone cable separately from the accessories menu. Leave notes at checkout with assembly details. If no instructions are provided, we will assume that any cable that is purchased is evenly divided among any hydrophones purchased with custom cable length. If cable is purchased while buying hydrophones with standard cable lengths, cable will be shipped separately in a bulk coil.

 
Features:

    Low cost
    Low self noise
    Good sensitivity
    Robust design handles accidental drops and temperature extremes
    Compact (4.5mm OD) Low-noise cable with tough urethane jacket
    Connects directly with thousands of consumer and pro audio devices
    Adapters allow use with telephone, radio, and pro audio equipment
    High-quality gold output connector
    Compact size and easy hand of cable
    High specific gravity and streamlined shape keeps hydrophone down in currents
    1-year limited warranty (details here)

H2dM (3.5mm TRS output)

Specifications are dependent upon the audio device to which the H2dM is connected and whether the hydrophone is driving stereo inputs or a single channel. The output impedance of the H2dM is set by the PIP supply from the audio device with which the hydrophone is used. Gain of the signal conditioning amplifier in the H2dM is related to the bias current and input impedance of the mic preamp. High- frequency performance is also limited by the output impedance of the hydrophone and the cable impedance—which is a function of length. For all of these reasons, we do not publish detailed response plots for this design. Please also note that further limitations in your overall system may result from the sampling rate of digital recorders and by the input stage of your audio device’s microphone preamp.

Note that there is no standard for plug-in power. Performance can vary significantly. The following specifications are based on typical response when using the H2dM with a compliance voltage of 2.5V and bias resistor of 1.1KΩ (two channels at 2.2KΩ each—2.2mA—typical of many compact digital recorders, including those that we sell).

 
Sensitivity:     -172dB re: 1V/µPa     (+/- 4dB 20Hz-4KHz)
Useful range:     <10 Hz to >100KHz     (not measured above 100KHz, approximate sensitivity @100KHz = -220dB re: 1V/µPa)
Polar Response:     Omnidirectional     (horizontal)
Operating depth:     <80 meters
Output impedance:     1.1 KΩ     (typical)
Power:     0.7 mA     (typical)
Minimum PIP req.:     2V, 0.7mA     (compliance voltage, short-circuit current - the hydrophone will work with lower current, but with
very unpredictable gain and greatly-reduced dynamic range)
 
Physical:     (cable and output plug excluded)
Dimensions:     25mm x 46mm
Mass:     105 grams
Specific Gravity:     5.3

 

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 interfaces1 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. 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. Do not make the assumption that, if the plug fits, the system will work.