Specifications

8x8 and 16x16 VGA / HDTV Matrix Switch with Audio, RS232 & IP Control
19
Figure 12 – Graph of VU dB level versus LED bar length
3.1.8.2 Adjusting the input audio Gain or attenuation
Enter the audio adjustment mode as described above.
Initially the audio gain level at the input is set to 0 db (gain of 1). Press and
release the  or  button to change the gain settings. Each push is about 1dB
change (see graph below). Press and hold the UP or DOWN button for more than
1 second, the gain will keep changing at the rate of 3dB per second. As you
increase or decrease the volume, besides the LED on the top row that is showing
the input channel you are adjusting, another blinking LED indicates the audio gain
setting. Again, position #10 indicates 0 db (or gain of 1). The range of
adjustment is about -24 dB to +6 dB (position 1 to position 16).
Figure 13 – Graph of Audio Gain level versus Volume setting LED position