Extron electronic MVX VGA A manual Viewing and adjusting the input audio level, Preliminary

Viewing and adjusting the input audio level

The audio level of each input can be displayed and adjusted through a range of -18 dB to +24 dB to ensure that there is no noticeable volume difference among sources (figure 3-42). The audio level can be adjusted from the front panel or via serial port control. The default audio level is 0 dB.

dBu	VU		dBu	VU
+24	21		+24	21
+21	18		+21	18
+19	15		+19	15
+16	12		+16	12
+13	9	VCR	+13	9
+10	6		+10	6
+7	3	Audio	+7	3
+4	0		+4	0
+1	-3	Inputs	+1	-3
-2	-6		-2	-6
-5	-9		-5	-9
-8	-12		-8	-12
-12	-15		-12	-15
-15	-18		-15	-18
-18	-21		-18	-21
Low Audio			Output
Output Level			Level
dBu	VU	MVX 128 VGA A		Audio System
+24	21
+21	18
+19	15		No noticeable
+16	12
+13	9		volume differences
+10	6	Audio
+7	3		between sources
+4	0	Inputs
+1	-3
-2	-6
-5	-9
-8	-12
-12	-15
-15	-18
-18	-21
High Audio
Output Level		CD Jukebox
Figure 3-42 — Audio gain and attenuation
1.	Press the Esc button to clear any input LEDs, output LEDs, or control LEDs
	that are lit.
2.	To enter Audio mode, press and hold the Audio button until the LED begins to
	blink, then release the button.
3.	Press and release an input button to select an input. The output LEDs display
	the audio level for the selected input.

•Switchers with 8 output LEDs — Each output LED indicates 1 dB when blinking slowly, 2 dB when blinking quickly, and 3 dB when lit steadily.

•Switchers with 16 output LEDs — Each output LED indicates 1 dB when blinking and 2 dB when lit steadily.

The Esc (>) and View (<) LEDs display the polarity (gain [+] or attenuation [–]). See the table on page 3-27 to read the displayed audio level.

4. Press and release the Esc (>) and View (<) buttons to increase and decrease the audio level by 1 dB per each push of the buttons.

Or, press and hold either button to change the level at a rate of 3 dB per second until the button is released or the upper or lower limit is reached.

PRELIMINARY

MVX VGA A Matrix Switchers • Operation 3-25