Marschall Acoustics Instruments Pty Ltd

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Trout arrays have been made to receive frequencies up to 1 MHz.
Marine Mammal Monitoring Array



A portable Trout M3 hydrophone array sonar system is ideal for researchers, scientists, marine mammal watching cruise ships, environmental monitoring organizations, and individual whale and dolphin watchers.

It is amazing what you can do with a small array on a sailing vessel.
Dolphin communications typically extend to a few tens of kHz in frequency.



Lightweight with no internal fluids, Trout array systems can be transported by air.
Just what do dolphins talk about?  Find out with Trout.


The standard Trout M3 array system is shipped complete with the battery powered water resistant Control Unit is powered by two rechargeable gel cell batteries mounted within the control unit.


Standard features include: external battery recharge points, volume control, headphone jack, and signal output.
(Note: DAT recorder and headphones are not included as part of the standard M3 product.)



Available are custom multi-channel Trout modules and multi-array deckbox receivers to customer specific requirements. Multi-octave nested arrays (with special high frequency modules) and full size battery powered deckboxes with your choice of interfaces are also available. Options have included custom auxilary sensors and control modules, as well as high speed and full ocean depth capabilities.

A section of full ocean depth high speed HF Trout modules.  Keep that Dolphin from getting away!


A dual battery powered deckbox with a range of custom outputs.


Track that underwater action with Trout!


Broadband, high fidelity, and lightweight, Trout hydrophones enable new progress in underwater research.