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A5 Hydrophone

Compact, modular hydrophone with integrated signal conditioning. Uniform response to 10 kHz.

Aquarian Scientific SKU: A5iM9
$236.00

Without Weight: Hydrophone is close to neutral buoyancy.

Optional Weight: 114 gram cable weight that threads onto A5 body. Assists in sinking the hydrophone and dampens vibrations in cable. Low-drag shape. Shipped separately. You may also request we build your hydrophone with the weight already attached for longer cable lengths, though note that it may add to you lead time.  Please request this service in your order notes. This is highly recommended if you are purchasing a hydrophone cable that is longer than 15m
Connector
Weight
Cable Length
  • Works directly with microphone input power
  • Compact form factor enables insertion in pipes
  • M10 threaded body enables easy panel or bulkhead mounting, and integration into industrial equipment
  • Flat frequency response for <10kHz measurement applications
  • Post-process recordings for professional audio applications
  • High sensitivity

What's Included:

  • A5 Hydrophone
  • Semi-rigid EVA travel case (not waterproof), excluded when length is over 20-meters
  • Optional removable 115g weight threads into M10 body

We are committed to prompt service. Many standard hydrophone variants are kept in stock and often ship the next business day. Custom builds are frequently completed within one week, depending on quantity and configuration.

We ship worldwide using trusted carriers including UPS, FedEx, DHL, and USPS. Shipping rates are calculated at checkout. International customers may be responsible for import duties, taxes, or brokerage fees assessed at delivery by their country and carrier.

Transit times and customs clearance can occasionally cause delays outside our control. Customers using their own courier account, freight forwarder, or uninsured shipping methods assume additional responsibility once the shipment leaves our facility.

For complete details on shipping methods, insurance, international shipments, delays, freight forwarding, and liability terms, please see our full Shipping Policy.
  • Aquarian made products are backed by a 1-year limited warranty covering defects in materials and workmanship under normal use.
  • Resold products manufactured by third parties may be covered by the original manufacturer’s warranty, where applicable.
  • Returns of unused, like-new products are generally accepted, subject to inspection and approval.

Please review our full policies for details on custom products, misuse conditions, returns, exclusions, and limitations.

The A5 hydrophone features a modular architecture with integrated M10 mounting threads, enabling panel mounting or attachment of the optional 115 g threaded weight.

The A5 includes integrated signal conditioning designed for direct compatibility with Plug-In Power (PIP) microphone input circuits. The low-profile 3.5 mm TRS connector is optimized for compact installations and panel-mount cable routing applications.

Removable XLR adapter option

An optional XLR adapter is available to enable compatibility with Phantom-powered recording equipment, audio interfaces, and mixers. The adapter contains its own onboard electronics and threads directly onto the hydrophone’s 3.5 mm TRS connector, allowing the same hydrophone to be used interchangeably with either 3.5 mm TRS or XLR-based systems. The adapter locks onto the connector to prevent disconnection.

Removable Weight

The optional 115 g stainless steel weight improves sinking and stability in deployments where the hydrophone is suspended by its cable. The weight threads directly onto the hydrophone housing to help minimize movement during use.

Custom Cable Length

Custom cable lengths are available up to 300 meters.

Long cable lengths can reduce high-frequency response due to cable capacitance effects, particularly in applications requiring extended bandwidth.

Electrical Specifications

The A5 integrated electronics are designed to connect directly with powered microphone inputs found on most consumer recording devices.

  • Minimum power consumption: 2.4V, 400uA
  • Maximum power consumption: 48V, 10mA

For advanced users, the A5 can also be powered from one leg of phantom power, as used in microphone preamps with XLR input. However, we recommend using the removable XLR adapter for lower noise and true low-impedance, balanced output. 

NOTE: TRRS jacks, typically used for headsets with cell phones and computers, will require an adapter to break out the separate mic and headphone jacks. The A5 will not work directly with AUX or LINE jacks, such as used on marine stereos and powered speakers, as these will not supply plug-in power and do not offer adequate gain.

Mechanical Specifications

  • 17.5mm diameter by 35mm overall length
  • M10 X 1.5 Threaded body with 15mm engagement length
  • Standard cable: CA-53 with 4.5mm OD

  • Max depth: 100 meters

    Acoustic Specifications

    • Sensitivity: -173dBV re: 1uPa
    • Uniform bandwidth 20Hz - 10KHz (+/-4dB)
    • Directivity: Omnidirectional (<20KHz)

    Receive Voltage Sensitivity