Check the listing for details. ART Solo MPA Multi-voice Tube Preamplifier. Condition: New. Listed at 379.99 USD. Level Up Your Sound with Tube Preamplification ART’s Solo MPA multi-voice tube preamplifier is a beginner-friendly entry into the world of outboard preamplification. The 1-channel preamp injects your signal with warm tube tone shaped by intuitive controls and features. You get XLR microphone inputs on the back panel with phantom power for condenser mics and a front-mounted high-impedance input for instruments. Operation is simple. First, dial up the ideal microphone sound using the adjustable input impedance knob. From there, use the tilt EQ and low-cut filter to shape the sound to perfection. Sweetwater recording engineers note that the Solo MPA keeps total harmonic distortion (THD) to an absolute minimum, ensuring noise-free recording for all occasions.