Alesis M1 Active 520 USB

frequency response: 56Hz-20kHz, 2x 1/4 balanced inputs, integrated USB audio interface (16bit/44.1/48kHz), magnetically shielded, 5" lightweight polypropylene woofer (50W), bi-amplified, 1€ silk-dome tweeter (24W), 1/4" stereo headphone output, bi-colour signal/clip indicator. (Pair).