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AS-1 Hydrophone

Broadband measurement hydrophone

The AS-1 is designed to provide maximum sensitivity in a small size while also providing a linear response in the bandwidth of the highest-quality commercial digital sound recording interfaces. Response is omnidirectional in the human auditory bandwidth, as well as omnidirectional in the horizontal axis at all frequencies (theoretical). Given these qualities, the AS-1 is well-suited for absolute underwater sound measurements in marine and industrial environments. It can also be used as an omnidirectional reference projector.

Use directly with your scope or DAQ device or use with the PA4 preamp and any digital recorder or sound interface for high-quality, low-cost underwater sound analysis.

Fitted, breathable EVA case included with cable lengths of 20 meters or less (longer cable assemblies will not fit in case and will be bulk shipped in allowable packaging).


  • Linear range: 1Hz to 100kHz ±2dB
  • Receiving Sensitivity: -208dBV re 1μPa (40μV / Pascal)
  • Transmitting Sensitivity: 140dB SPL re 1μPa, 1Vrms input at 1meter, 90kHz
  • Maximum Input Voltage: 30V p-p (continuous); 150V p-p (<10% duty cycle, <100KHz)
  • Horizontal Directivity(20kHz): ±0.2dB
  • Horizontal Directivity (100kHz): ±1dB
  • Vertical Directivity (20kHz): ±1dB
  • Vertical Directivity (100kHz): +6dB -11dB
  • Operating depth: 200m
  • Survival depth: 350m
  • Operating temperature range: -10°C to +80°C
  • Nominal capacitance: 5nF +/- 15% (plus cable @ 118pF/m)
  • Output connection: BNC (standard)
  • Size: 12mm D x 40mm L
  • Weight (in air): 8g (plus cable @ 28g/m)
  • Cable length: 9 meters standard. Any length on request.
  • Cable Jacket: Polyurethane, OD: 4.5mm
  • Encapsulant: Polyurethane


AS1 data page 1

AS1 data page 2

See User Manual and Charts for additional information.

BRC Engineering has designed a coupler for the AS-1 to be used with the G.R.A.S. pistonphone calibrator. For sales and rental of these calibration items, please contact Richard Craig at BRC: 707-226-3332 or brcnorcal<at>aol<dot>com.