The ART Tube MP Project Series is a professional quality audio interface that lets you connect microphone, instrument, and line level signals to a mixer or other audio input. The Tube MP Project Series' hybrid design is the latest in a long line of ART tube preamps. They took their legendary Tube MP series and updated every aspect of the design, inside and out, while still maintaining a compact, reliable, and cost effective product. From the new all-aluminum stackable chassis to the precision LED level metering circuitry, ART have improved virtually every aspect of their already successful Tube MP series. The new ultra low noise discrete microphone preamp front end has an extremely flat and wide frequency response and handles a wide range of input signal levels with a minimum of coloration. This gives you a very clean and neutral sound with a wide variety of signal sources. The high impedance 1/4-inch instrument input bypasses the microphone preamp circuitry to maintain a clean signal path. ART uses a high quality 12AX7A tube inside to add warmth to musical dynamics and the power supply is external to keep AC line noise and hum back at the wall. ART Tube MP Project Series Features Extremely low noise discrete front end Up to 70dB of clean, musical gain High output signal drive capability Fast FET limiter to prevent overload Switch selectable input impedance Precision LED metering Built-in low noise, +48V phantom power supply XLR and 1/4-inch inputs and outputs Phase invert switch High cut filter switch Variable input and output controls Compact, stackable all aluminum chassis The input Gain control and switch help you to maximize your input dynamic range as well as control how hard you are driving the tube. Input impedance is switch selectable to optimize your microphone's response right on the front end. These two features are a must when trying to get the most out of a vintage ribbon or studio grade microphone.