Extron Electronics MLS 406SA - Manual (Page 30)

Operation and Setup, cont’d
MLS 304 Series, MLS 406 Series • Operation and Setup 3-
PRELIMINAR
Y
Making adjustments
Leave the bass and treble set to 0 and the loudness control set to off (default) before
adjusting the input level (sensitivity). Audio input levels must be adjusted with an
active audio signal.
1. Connect an active audio source to an input on the switcher.
2. Select the MLS input with the active input signal.
3. Adjust the switcher’s input level via the front panel or the control software
until the desired output level is reached and/or the Mid/normal LED turns
on or blinks.
N Increasing the audio level beyond the point at which the Mid/normal LED
blinks may result in a distorted output signal.
Front panel setup mode: press and hold the input button for 3 seconds; the
input’s LED blinks. While still pressing the input button, rotate the
Volume knob to adjust the input level.
N For the MA and SA models, in setup mode a blinking or lit Mid/normal LED
indicates that the power amplifier can deliver maximum power output.
MAX
MID
MIN
Signal detection threshold
•
Min LED lights: a signal of at least -20 dBV (-18 dBu) (a low
level consumer product level) is detected at the input.
Clipping level
•
Max LED blinks or lights: the audio input level is too high;
audio will be distorted.
Lower the input gain so that this LED does not turn on.
Normal range
•
Mid LED blinks or lights: input level has been
properly adjusted. Adjust the input
gain/attenuation until this LED blinks.
MAX
MID
MIN
NOTE If the Max/Clip LED lights, the audio may be clipped.
MLS 304MA, MLS 304SA, MLS 406MA, MLS 406SA
Signal: when lit this indicates that a signal of at
least -20 dBV (-18 dBu) is detected at the input.
Peak: a blinking LED indicates the level is set too high.
Normal: the specified output level (-10 dBV or +4 dBu)
has been reached. A blinking LED indicates the level
is set properly for max. power output.
MLS 406
4. Once the desired level is reached, release the input button, to save the audio
settings.
5. Repeat steps 1 through 4 for each input.
6. Fine tune levels including bass, treble, and loudness once all output devices
(speaker, amp, etc.) have been connected.
Loudness control automatically provides the correct amount of bass and treble
required to compensate for the change in response of the human ear at low levels.
As volume decreases, the MLS automatically boosts the signal at 100 Hz and
10 kHz. As volume is increased, the boost at those frequencies is decreased. By
default loudness control is set to off. Use the control software to turn it on. See
appendix A, Reference Material for a frequency response graph when loudness is
turned on.