Biamp Tesira SIC-4 CK InternalSIC 4, modular analog input card kit The Tesira SEC 4 is a modular analog input card for use with Tesira SERVER and SERVER IO devices. Each SEC 4 provides four channels of mic or line level audio input with Acoustic Echo Cancellation and also features Biamp SpeechSense technology, which enhances speech processing by more accurately identifying human speech. The Tesira SEC 4 & Tesira SEC 4 CK comply with the United States Trade Agreement Act (TAA),