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H2a Hydrophone


Please see our upgraded H2d. We are leaving this page active for a limited time for users that want to buy a match for a previously-purchased H2a. The H2a may also, with its lower sensitivity, be better for high-amplitude recording.

The H2a hydrophone is designed to work with any recording device, computer, or transmitter that offers a plug-in-powered, 3.5mm microphone input. It uses the same low-noise, robust transducer assembly as the H1a, but includes a low noise internal impedance buffer amp. Operation is very simple: just connect to your recorder or computer and use. Plug-in power (PIP) is present in nearly all devices with a microphone jack of this size. Check the user manual for your device to be sure. PIP may need to be switched on in your device.

The H2a offers the following advantages:

  • 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 audio, wireless and computer products.
  • Adapters allow use with telephone, radio, and pro audio equipment.
  • High-quality REAN 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

COMPATIBILITY NOTES: The output connector used with H2a is also used for many other types of audio connections. A compatible jack does not ensure proper operation.

SMART PHONES, TABLETS AND COMPUTERS: All smart phones and tablets that we are aware of use the same connection for both the microphone and headphones. Many newer computers also use this combination jack. The H2a will not work directly with these combination jacks. A TRRS plug adapter adapter, such as the StarTech MUYHSMFF must be used. Due to limitations in the quality of the preamps that are built into these devices, we recommend using the H2a-XLR hydrophone and the Zoom U-22 for connecting to these devices (connect by USB adapter for iPhone or iPad or use as simple preamp with appropriate adapters for Android).

MARINE STEREOS: The H2a hydrophone will not work with a line or auxiliary audio input on a marine stereo system. It will connect to many stereos, but these will not supply plug-in power or adequate gain. A mic preamp is required.

DIGITAL RECORDERS: Many of the new digital recorders require that you go into the menu system and switch on plug-in power. The H2a will not work before doing this.

User Manual--includes specifications and warranty statement

Custom cable lengths: Select the custom option above, then buy hydrophone cable separately from the accessories menu. Leave notes at checkout with assembly details.

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