Copyright © 2011-2013 SM2M+ User Manual
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only about 60% of the card space to better minimize card usage
for longer deployments. The files can be converted to WAV format
quickly and easily using our free Kaleidoscope conversion software.
Triggered recording is available to further minimize card usage.
Triggers do not work well for lower sample rates because there will
likely be constant false triggers from ambient noise. For ultrasonic
recording where there is much less noise sources triggers can be
an excellent way to reduce data and only record when there is an
event of interest. If triggers are set in WAV mode, the recorder
will save a WAV file for each triggered event and will delete
recordings that do not appear to contain biological activity. To
discuss optimal settings for your particular deployment, please
contact Wildlife Acoustics’ support team at
For any single hydrophone configuration, the unit is shipped with
both channels connected to the single hydrophone, so it is
arbitrary which channel you select for recording. This does present
some opportunity for creative recording. Different gain, sample
rate and trigger levels could be used on the different channels. For
example you might want to record at a high sample rate with a
high pass filter to filter out lower sounds with more gain on one
channel, and a lower sample rate with no filter and less gain on the
other. Two sample rates cannot be used concurrently, but the
recorder can easily be programmed to switch between two rates
at different times.
Recording Schedule
The SM2M+ can handle any complexity of schedule. It is even
possible to program different sample rates for different recording
sessions. Details on scheduling can be found in the SM2+ User
Manual. It is important to remember that when the SM2M+ is not
recording it is in a very low power state such that low duty cycles
can significantly extend the possible deployment longevity.
The SM2M will wake up 3.5 minutes before any scheduled
recording period to give the hydrophone a chance to charge up for
reduced noise
Main Batteries
The SM2M+ Submersible is powered with up to 32 D cells batteries
and the Deep Water up to 64 batteries. The recorder can accept
