The PA6 is designed to connect passive piezo sensors, used in most hydrophones, to professional-grade microphone preamplifiers. This allows to directly connect the hydrophone into a professional recorder with XLR inputs. The PA6 will also be useful for many other sensors, such as geophones, accelerometers, contact microphones, and any device requiring a low-noise, high-impedance buffer that works within the human auditory spectrum and above.Phantom power is required. 48V is the standard but the PA6 is designed to work with supplies as low as 24V with negligible performance difference.NOTE: This amplifier is not waterproof. Care should be taken to keep connectors and electrical components as dry as possible, especially when working in corrosive environments such as seawater or chlorinated water. Specifications:Default board setup: 26dB gain, differential output, P48 phantom-powered Equivalent Input Noise: -122dBV; 10nF input shunt, A-weighted 20Hz – 22KHz, 1KΩ output loadTotal Broadband Output Noise: -92dBV; 10nF input shunt, Unweighted 10Hz – 90KHz, 1KΩ output loadBandwidth: 14Hz - 90KHz; +0/-0.5dB, 1KΩ output load4Hz - 270KHz; +0/-3dB, 1KΩ output loadTHD+N: <0.01% @1KHz, -10dBV output,1KΩ output loadMax output: >3dBV RMS @1KHz, 1KΩ output load, 1% THDCurrent consumption: 5 mA 48V Phantom Power (from mic preamp) or 2.1 mA 24V Phantom Power (from mic preamp)Gain: 26dB as standardDifferential: pins 2 & 3 (Standard—can be factory-modified)Z out: 17 Ω Each phase to groundZ in: 10 MΩ (Standard—can be factory-modified to filter low frequencies)Physical: Ø19.7mm x 66.8mm, 42g. (Built on Switchcraft AAA3MZ connector)