Two-channel preamplifier for pro recording and studio use. Perfect little preamp for your studio, in great shape, very little use. Here is some additional info from the manufacturer: M-Audio DMP3 Dual Preamplifier Any professional recording engineer will tell you that quality microphone/instrument preamps are just as important as the microphones themselves. Unfortunately, the preamps found in most affordable mixers don't do justice to the rest of your gear and most high-quality preamps cost more than your computer. That's why M-Audio made the affordable new DMP3. Why a DMP3 The DMP3 isn't just any 2-channel microphone/instrument preamp. M-Audio's design team embarked on a mission to combine years of experience with the finest components in order to bring you an impressive blend of high quality and affordable price. Whether you use it live or in the studio, the DMP3 is one of those pieces of gear destined to be integral in defining your sound. Astounding frequency response of 20Hz to 100kHz makes the DMP3 ideal for today's 96k recording work and the perfect companion for the M-Audio Delta line of PCI audio interface cards. High and low gain controls accommodate a wide range of microphone and instrument levels, offering up to a substantial 66dB of gain. And the classic VU meters are just one indication of the soul you'll find in the DMP3's sound. Applications: - Optimizing signal level - Recording with soundcards - Direct recording of instruments Features - 2-channel preamp with XLR microphone inputs and 1/4 in. instrument inputs accommodate any type of audio signal - Balanced outputs on TRS jacks deliver hum-free professional audio - Low harmonic distortion (THD + N: .002% @ 1kHz) for ultra-clean sound - Exceptional dynamic range to capture all the nuances of your music - 20Hz to 100kHz frequency response (+0/-1dB) ideal for 96k digital recording - High and low gain range controls offer up to 66dB of gain - Clip LED for visual feedback of detrimental levels -...