The Tesira SEC-4 is a modular analog input card for use with Tesira SERVER or SERVER-IO devices. 

Each SEC-4 provides 4 channels of mic or line level audio input with Acoustic Echo Cancellation. 

The SEC-4 utilizes a class leading AEC algorithm and also features two new Biamp algorithms, SpeechSense and AmbientSense which enhance speech processing by more accurately distinguishing between human speech and noise.