Ashly mXa-1502 12-Channel 4-Zone DSP Mixer-Amplifier - Manual (Page 25)

sharing method of automixing has been found
to be superior to gating automixers due to the
following characteristics:
• The automatic gain action has a smooth
transparent sound as though a person
were mixing the inputs to follow the audio
program rather than rapid gating on-and-off
of channels.
• Properly designed gain-sharing automixers
correctly adjust for mixing of coherent
versus non-coherent signals for a more
consistent final mix level without feedback
as channel gains are automatically
changing.
• A gain-sharing automixer is easier to setup
and adjust without the need for threshold,
attack, release, depth, and number-of-
open-mics (NOM) controls.
Mixer input channels can be individually
selected as auto-mixed or manual mixed, all
summed together to the same mixer output.
Channels which are selected as auto will
participate in the automix in that they will
contribute to the automatic adjustment of
other automix channel gains. Likewise, their
channel gain will be affected by the signal
level present on other automix channels.
Manual mixer channels (not selected as
auto) will mix independently of the automixer
channels into the output, only controlled by
their fader setting. The fader on auto channels
still controls the input level before automatic
mixing takes place so that more of the system
gain can be applied to one channel versus
another.
Automixer Setup
Setting-up the Ashly gain-sharing automixer
is quite simple compared to other gating-
type automixers. The following procedure is
recommended for most multi-microphone
speech applications.
• Start with all mixer faders off and the
automixer response time set to 0.1 seconds.
• Configure the mixer input channel routing
as desired and select <Automix> on the
channels to be automixed.
• Start with one of the main speech channels,
or one which is centrally located. Slowly
increase the fader for this one channel just
until feedback starts, then lower the fader
approximately 3 dB to stay comfortably
below feedback. This sets the total mixer
system gain.
• Now increase the level of the other automix-
enabled input channels to approximately
the same position as the first channel.
The system will not feedback because the
automixer will slowly attenuate the active
channels as more channels are turned-on to
maintain a constant total system gain.
• During the program, individual channel
faders may be raised or lowered to adjust for
the weakness or strength of the respective
talkers while the automixer is active.
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mXa-1502 • Operating Manual Ashly AquaControl™ Software