Aquarian Audio Products H2dM User Manual - Page 2
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Print PageSpecifications
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 For all of these reasons, we do not publish detailed response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 1.1K (two channels at 2.2K each—2.2mA—typical of many compact digital recorders,
including those that we sell).
Sensitivity:
Useful range:
Polar Response:
Operating depth:
Output impedance:
Power:
Minimum PIP req.:
Physical:
Dimensions:
Mass:
Specific Gravity:
Warranty Statement
Aquarian Audio warrants the H2dM Hydrophone from electrical failure or defects in workmanship for a
period of one year following the date of purchase. Warranty claims or repairs can be made directly through
Aquarian Audio. Corroded output plugs are not covered under warranty. Additional terms and conditions
apply. For full details please view our general warranty statement at
http://www.aquarianaudio.com/warranty.html
-172dB re: 1V/Pa
<10 Hz to >100KHz
Omnidirectional
(horizontal)
<80 meters
1.1 K
0.7 mA
2V, 0.7mA
25mm x 46mm
105 grams
5.3
A division of AFAB Enterprises
5677 Patricia Lane Anacortes, WA 98221
(360) 299-0372
www.AquarianAudio.com
(+/- 4dB 20Hz-4KHz)
(not measured above 100KHz, approximate sensitivity
@100KHz = -220dB re: 1V/Pa)
(typical)
(typical)
(compliance voltage, short-circuit current)
(the hydrophone will work with lower current, but with
very unpredictable gain and greatly-reduced dynamic range)
(cable and output plug excluded)
Aquarian Audio & Scientific
USA