Tesira EX-AEC Half-Rack Expander 4x Mic/Line Inputs with AECThe Tesira EX AEC is a half rack expander box for use with AVB enabled Tesira server class devices. The EX AEC is a 4 channel mic or line level audio input expander with AEC (Acoustic Echo Cancellation). The expander communicates with the Tesira AVB network for audio networking, configuration, and control, and is powered by PoE+. Product Features Four channels of balanced mic or line level input with AEC (Acoustic Echo Cancellation) 0 66dB gain,