Configuring Lineout And Preamp Output Levels; Adjusting Audio Input Levels - Extron electronics MLS 304MA User Manual

Configuring Lineout and Preamp output levels

Before adjusting any input levels, you must select an output level from the
following options. You do not need to change the output level if the Lineout and
Preamp outputs will not be used.
• -10 dBV, unbalanced (consumer) (default): typically used when the switcher's
output is connected to consumer products such as VCRs, stereo receiver-
amplifiers, or self-powered speakers with unbalanced inputs
• +4 dBu, balanced (professional): typically used when the switcher's output is
connected to professional products such as mixers, power amplifiers, and
some assistive listening devices with balanced inputs.
N Check the manufacturers' specifications for details on input/output devices you
will connect to the Preamp and Lineout outputs.

Adjusting audio input levels

Adjusting the input level (sensitivity) for each input via the front panel or the
supplied control software will ensure that the switcher can deliver maximum
power out of the amplifier, output the proper signal on the Lineout and Preamp
outputs, and prevent noticeable jumps in audio levels during input switching.
The input level (sensitivity) can be adjusted (-42 dB to +24 dB) for all of the inputs,
including the Aux/Mix input. The default input level (sensitivity) for each input is
set for -10 dBV, unbalanced, consumer-type signals.
N The Auxiliary/Mix input level can be adjusted via the rear panel only.
It cannot be adjusted via the control software.
Common output levels for audio source devices range from -20 dBV, unbalanced, to
+4 dBu, balanced. If the input level sensitivity settings are not closely matched to
the source devices' levels, the signal may be overdriven and distorted.
• Consumer portable devices such as personal CD players and laptops typically
have fixed and/or variable unbalanced outputs. If connecting a variable level
output to the switcher, you must make adjustments with the source's volume
set to maximum.
• Consumer non-portable devices such as VCRs, DVD players, and computer
sound cards typically output an unbalanced -10 dBV signal.
• Professional products such as preamps, mixers, and signal processors typically
output a balanced +4 dBu signal.
N There can be large variations in sources' output levels. Check the
manufacturers' specifications for details on devices connected to switcher's
inputs.
Input level adjustments can be made in 1 dB increments/decrements via the front
panel or the control software. See chapter 4, Serial Communication for details on
software settings.
N Because there are many different output levels for source devices, Extron
recommends that you adjust the input level (sensitivity) for each input. When
making these adjustments, use source material with a wide dynamic range.
The material should have loud passages that are representative of what will be
used in the system.
MLS 304 Series, MLS 406 Series • Operation and Setup 3-