Quantum Data 780C - Testing an HDMI or HDBaseT Source’s Response to EDIDs; Configurations for Testing an HDMI Source Devices Response to an EDID

780C Multi-Interface Interoperability Tester – User Guide Page 125
September 29, 2014
Revision A1
6. Specify the speaker amplitude in increments of +/-3dB or =/-1dB using the buttons under Speaker Level.
Select Mute to extinguish the audio.