"The Summit Audio MPC-100A Mic Preamp/ Compressor-Limiter is a single channel tube preamp and tube compressor/limiter all in a two-space rackmount unit. It accepts line, microphone, and Hi-Z input signals. The preamplifier provides a warm yet crisp vacuum tube tone. The compressor/limiter section has very fast attack times, making it ideal for optimizing signal prior to entering the digital domain. In addition to having superb sound and a user friendly interface, the MPC-100A has the robust build quality consistent with the Summit Audio family of products."