Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Headphone Power Amplifier

BII-5200 Series Power Capability 200mW, Power Bandwidth 30kHz

BII-5200 headphone power amplifiers boost the signals from hydrophones to drive the headphones, which make underwater sounds (such as whale sounds) listening easy and simplified, and add listening capability to your hydrophones.

With suitable adaptors between hydrophones and the recorders (DAQs), you can listen the sounds in real-time while they are being recorded.

Suggested Application

  • Underwater Sound Listening, Whale Watching
  • Bioacoustics and Biology, Marine Animal Behavior Research
  • Amplify hydrophone signals to drive headphones


  • 200 mWrms
  • Driving 16 to 100 Ω Headphones
  • Bandwidth: 30kHz
  • Hermetic, Waterproof, Portable and Small Compact Size


Headphone Power Amplifier BII-5201 BII-5202
Signal Type: Marine Animal Sounds
Active Sonar Signals
Underwater Communication Signals
Marine Animal Sounds
Active Sonar Signals
Underwater Communication Signals
Power Capability: 1. 200 mWrms for 16 Ω headphone
2. 130 mWrms for 24 Ω headphone
3. 100 mWrms for 32 Ω headphone
1. 200 mWrms for 50 Ω headphone
2. 159 mWrms for 63 Ω headphone
3. 100 mWrms for 100 Ω headphone
Gain: -20 dB / 0 dB
Input Impedance: 50 kΩ
Supply Voltage: +18 VDC (Two +9VDC Batteries)
Quiescent Current: 1.6 mA
Power Bandwidth (-3 dB): 3 Hz to 30 kHz
Headphone Impedance: 16 Ω to 100 Ω
Input Connector: 1. BNC (default)
2. 1/8" (3.5mm) TRS Jack
3. 1/4" (6.35mm) TRS Jack
4. XRL Socket
5. Custom
Output Connector: 1/8" (3.5mm) TRS Jack
Power Supply Connector: 9V Battery Snap
Optional Add-on: One Headphone:
32 Ω, 91 dB/mW, 3.5 mm TRS Plug
Size: Diameter: 42 mm
Height:    40 mm
Operating Temperature: -10°C to 60°C
Storage Temperature: -40°C to 60°C
Weight: 160 grams

Related Products

  • Hydrophone: Low Noise, Low Cost and Deep Ocean
  • BII-7010: Low Noise Preamplified Broadband Hydrophone

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