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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.
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.
Hydrophone preamplifier with phantom power for connecting any of our hydrophones, buffer amps, or adapters with XLR output to iPod, smart phone, or tablet. Also works well to boost the signal to portable recorders with adapter.
Portable 2-channel battery-powered mic / hydrophone preamp, mixer and headphone amp for H2a and H2a-XLR
Amplified speaker for use with H1a hydrophones