RESON's EC 6070 is a sophisticated preamplifier and audio amplifier system with loudspeakers designed for monitoring underwater acoustic signals from 10Hz to 700kHz. This system is ideal for listening and recording both low frequency whale vocalization and high-frequency echo-location sonar signals of dolphins and porpoises. A selectable envelope modulation detector converts high frequency signals to human-audible range. The versatility and user-friendly operation of the EC 6070 make it a beneficial addition to many acoustic research laboratories, aquariums, and bioacoustic programs. It operates on 24VDC, with several stages of adjustable input and output gain, built-in high-pass filter options, convenient output lines for ocsilloscopes, analyzing equipment, or recorders (tape, minidisc, etc), and input lines for playback.se in single ended mode: Use positive output pin together with GND.