Extron electronic MLS 406MA, MLS 304SA, MLS 304MA Configuring Lineout and Preamp output levels

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.

NCheck 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.

NThe 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-portabledevices 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.

NThere 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.

NBecause 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.

PRELIMINARY

MLS 304 Series, MLS 406 Series • Operation and Setup 3-