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Song Meter SM4TS Acoustic Recorder

Song Meter SM4TS Acoustic Recorder

The Song Meter SM4TS is specially designed to help scientists triangulate the location of vocalizing animals. Delivering all the features of the industry standard Song Meter SM4, the SM4TS is a modified SM4 recorder that utilizes a sophisticated GPS time-sync receiver to synchronize the clocks on multiple recorders to within one millisecond.


Free extra year's warranty, plus a free book or voucher worth £35!


Time Synchronization

Crystal oscillators used in clocks and electronics, including the SM4, are not perfect. One crystal might be faster or slower than another, and oscillations might speed up or slow down as temperatures change. 

The SM4TS GPS receiver can synchronize your recordings across multiple recorders to within one millisecond by syncing with each device’s clock. The start times are synchronized to commence on the second as indicated in the filename, and the sample rate is fine-tuned over the duration of the recording to keep the recordings synchronized — with less than one millisecond of error. 


High-Quality Recordings

The SM4TS features a second-generation built-in microphone that creates higher quality recordings than previous generations of Song Meter microphones. The low-noise microphone- has a superior signal-to-noise ratio, so you capture more sounds that matter to you.


Easy-to-use Scheduling

To get you started quickly, the SM4TS features easy-to-use Quick Start schedules, such as sunrise to sunset. You can also customize your schedules for specific recording needs. The free SM4TS Configurator software can be used to configure settings and schedules from a computer. The SM4TS Configurator software also provides a Security Lock option to prevent accidental changes to deployment and recording settings.


Large Storage Capacity

The SM4TS has two SD card slots that accept SDHC and SDXC cards. When fitted with two 1TB cards, the SM4TS can store up to two terabytes of data.

In addition, you can save card space by using W4V Compression. The format doubles the capacity of your SD cards with no noticeable degradation of recording quality. The resulting W4V files can be opened with and/or converted to uncompressed WAV files using the free version of Kaleidoscope software.



By time-synchronizing multiple recorders, scientists can triangulate the approximate location of vocalizing animals based on the exact time each signal was detected across the array of microphones — providing valuable information about animal locations and behaviors.

  • Specialized, weatherproof GPS attachment allows you to time-sync multiple recorders, so you can triangulate the locations of vocalizing animals*
  • Part of the industry standard line of wildlife audio recorders, with over 30,000 SM4 family recorders sold to date
  • Proven and reliable, with only 0.64% of recorders requiring in-warranty repairs
  • 3-year warranty
  • Weatherproof design suitable for any environment
  • Compact, at 8.6” x 7.32” x 3.1” (218 mm x 186 mm x 78 mm)
  • Built-in fail-safe and fault-tolerant technology, including two flash cards for failover and extensive internal diagnostics
  • One built-in, low-noise microphone allows for quality recordings
  • Flexible gain settings and high-pass filters for optimal performance in different recording environments
  • Record up to 650 hours scheduled over months using four D cell batteries, 350 hours using NiMH batteries or even longer using external power.
  • Choose a quick-start schedule or easily create your own
  • Strong anti-alias filters improve signal-to-noise ratios
  • Capable of storing terabytes of data to two SDHC/SDXC flash cards
  • GPS attachment also allows you to set date, time and location for multiple recorders
  • Save card space via W4V compression, doubling the capacity of SD cards without degrading recording quality
  • Compatible with Kaleidoscope Pro software to quickly scan recordings to help find species of interest


*Wildlife Acoustics does not provide the software required for triangulation calculations.


Technical Specifications


Recording Format:

Two-channel, 16-bit PCM .wav files or compressed .w4v files

Sample Rates:

The recorder supports the following sample rates in samples per second on one or two channels: 8000, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 96000

Built-in Microphones (2):

  • Directional Characteristic: Omni-Directional
  • Sensitivity: -35 ±4 dB (0 dB=1V/pa@1kHz)
  • Signal to Noise Ratio: 80 dB Typ. at 1kHz (1 Pa, A weighted network)
  • Max Input Sound Level: 126 dB SPL Typ.


510 hours (typical at 24kHz stereo) with 4 D-cell Alkaline or 310 hours with NiHM batteries

Power Options:

  • Internal power using 4 D-size alkaline or rechargeable NiHM batteries
  • External power via optional SM3/SM4 Power Cable


*We recommend using SanDisk SDHC/SDXC cards. You can buy them from our store.

  • 2 SDHC/SDXC flash card slots (Class 4 or greater)*
  • More than 1 terabyte total capacity using 2 512GB SDXC cards
  • Compression is available to further increase storage capacity

Dimensions: Height: 8.6" / 218 mm; Width: 7.32" / 186 mm; Depth: 3.1" / 78 mm

Enclosure Material: Polycarbonate

Enclosure Environmental Protection: Fully weatherproof with integrated humidity control

Operating Temperature: -4°F to +185°F or -20°C to 85°C

Warranty: 3 years (4 years from us) - microphones 3 years

  • Microphone Options

    SMM-A2 Acoustic Microphone

    The cabled SMM-A2 acoustic microphone is the cabled version of the SM4's built in microphones. As with the recorder's built-in microphones, this mic creates higher quality recordings than those from all previous Song Meter microphones models. The microphone is weatherproof and comes with a 3-meter cable. It can also be deployed up to 100 meters away from the recorder.

  • Audio Specifications


    Sensitivity built-in -35 ±4 dB (0 dB=1V/pa@1kHz)
    Sensitivity SMM-A2 -9 ±4 dB (0 dB=1V/pa@1kHz)
    Signal-to-Noise Ratio 80dB typical at 1kHz (1 Pa, A weighted network)
    Dynamic Range with Preamplifier 14dB - 100dB SPL at 0dB gain
    Dynamic Range without Preamplifier 39dB - 126dB SPL at 0dB gain


  • Accessories

    SM3/SM4 Power Cable

    The SM3/SM4 Power Cable allows the SM4 to run on external battery power or a complete solar panel charging system. Simply plug the cable into the recorder's power connector and connect the other end to the battery system using the included spade or ring terminals. The SM4 will handle external power sources from 4.5 to 17V DC and is protected against accidental reverse voltage.

    Marine-Grade Padlock

    This lock will ensure your recorder's cover is secured. The unit features a brass body and cylinder to provide extra resistance to the elements. The marine grade lock is keyed alike, allowing multiple locks to open with the same key.

    Weather Resistant Cable Lock

    The adjustable locking mechanism holds the 6'/1.8m cable tight in any position for a secure fit. The unit features a weather resistant lock and vinyl coated 5/16"/8mm braided steel cable. Note: Lock is keyed differently.

    SM4 Armor

    Made of indestructible steel and coated in a durable powder epoxy finish, this custom-designed case is the best solution for preventing prying teeth and claws from damaging your SM4. It provides visibility of the unit's LED light and also protects the unit's cable and power connections.

    Song Meter Surge Suppressor

    The Song Meter Surge Suppressor protects SM4/SM4BAT recorders from power surges that could harm your recorders. This accessory should be used wherever microphones are mounted at elevation. Combine the Surge Suppressor with the SMM-U2 Grounding Bracket for added protection.

    The suppressor is also compatible with the SM3 and SM3BAT.

    Replacement Windscreens

    One pair. Includes clips.

    SM3/SM4 Microphone Cable (3/10/50 meters)

    For SM3 and SM4 families. Compatible with SMM-A1, A2, U1, U2 microphones.

VAT Included
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