Extron electronic MVX 88 Series manual Adjusting input audio gain and attenuation, Preliminary

PRELIMINARY

Operation, cont’d

2. Press and release the Input 1 button (figure 3-29).

All LEDs except Input 1 and the Preset LED go out. The Input 1 LED and Preset LED remain lit for 1 second to indicate the recalled preset number and then go out.

Press and release the Input 1 button to select preset 1.

1 2 3

Preset 2 Preset 3

All LEDs except the recalled preset's LED go out.

INPUTS

1 2 3 3 4 PRESET

The LED for the recalled preset and the Preset LED remain lit for 1 second then go out.

Figure 3-29 — Select the preset, MVX 48

Adjusting input audio gain and attenuation

Audio/video switchers have input audio gain and attenuation adjustments. In Audio Setup mode the audio gain or attenuation of each input can be adjusted through a range of –18 dB to +10 dB. This adjustment range ensures that there is no noticeable volume difference among sources. It also eliminates the need for separate preamps or attenuators when used with professional (higher line level) and consumer (lower line level) audio equipment (figure 3-30).

dBu	dBv																			dBu	dBv
																				+10	+8
+10	+8
																				+7	+5
+7	+5																			+4	+2
+4	+2																			+1	-1
+1	-1																			-2	-4
-2	-3				Laptop															-5	-7
-5	-7	Audio																		-8	-10
-8	-10																			-12	-14
-12	-14	Inputs																		-18	-20
-18	-20																			Output
Low Audio
																				Level
Output Level
																				MVX SERIES
						INPUTS								OUTPUTS						VGA/AUDIO MATRIX SWITCHER
		1	2	3	4	5	6	7	8	1	2	3	4	5	6	7	8	ENTER	PRESET	I/O
																				VID +dB
																				AUD -dB
																				AUDIO SETUP

		Audio		MVX VGA A Series Switcher	Audio System
dBu	dBv	Inputs
+10	+8				No noticeable volume
+7	+5
+1	-1	VIDEO INPUT		differences between sources
+4	+2	DAV101CM	VGA LINE DRIVER
			POWER
-2	-3
-5	-7	DAS101 CM
-8	-10
-12	-14
-18	-20

High Audio

Output Level

Computer

Figure 3-30 — Audio gain and attenuation

3-18 MVX 44 / 48 / 84 / 88 VGA Matrix Switchers • Operation