The Seymour Duncan Wavelength DUO for nylon string guitars combines an undersaddle transducer and omni-directional condenser mic with a high-headroom 18 volt preamp. This model is designed for classical and flamenco guitars with nylon strings. The Wavelength Duo captures the full range, detail, body and character of your acoustic guitar. As part of Seymour Duncan's Acoustic Pro line, this system combines the Wavelength Solo pickup system and a high quality condenser microphone for the most natural sound possible. The Wavelength Duo uses the Wavelength unitary design, piezoelectric co-polymer undersaddle pickup, and a highly efficient, miniature omni-directional electret condenser microphone. This microphone is nestled in a special absorptive, visco-elastic polymer shock mount for optimal isolation. Two lightweight, low-profile soundhole-mounted thumbwheel controls allow easy adjustments of master volume and microphone volume. The microphone channel has two stages of frequency roll-off to combat low frequency resonant feedback. You can even wire it in stereo to separate the pickup and mic outputs for connecting to a two-channel preamp. And the two sound sources are coupled to an 18V high-headroom, low-noise, high-input impedance preamp with twice the dynamic range of typical 9V systems.