The STM2 is a quality low-noise microphone preamplifier designed for use in commercial sound, broadcast, and recording. The STM2 is very flexible, with gain adjustment from 35 to 65 dB, two balanced or unbalanced outputs, and available phantom supply input. Its ultra-low distortion and low-noise performance make it the best choice, even when larger preamps could be used. The singleended supply input range is from 24 to 33 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. Each output drives high or low impedance loads. - RDL PS-24AS Power Supply IS NOT Included.