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Consider using a digital recorder as a mic preamp. All of them will allow you to monitor sound live, whether recording or not. For details, check out the new Zoom H5 and others on our recorders page.
Amplified speaker for use with H1a hydrophones
Low-cost Hydrophone FET buffer amp, low-noise, low-power, 3dB gain. Use with H1 hydrophones. Also works great for buffering piezo contact microphones, electric guitars and other high-impedance audio signals.
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