Dan Dugan Sound Design D-3 - Manual (Page 36)

Dugan Model D-3 User Guide Operation
36
3.5 Gain Limiting
The acoustic gain increases as each mic comes on, whether this occurs manually by
placing that channel in
man
mode or automatically by using the Music System. Gain
Limiting manages new mics entering the system to avoid overwhelming the mix with
feedback or noise. Gain Limiting is controlled by the
NOM
(Number-of-Open-Mics)
channel buttons and the master
NOM gain limit
pot. Since the Model D-3 has no master
audio channel, Gain Limiting reduces the gain on all input channels for which
NOM
is
active. Gain Limiting is the only automatic mixing function that can be active when the
channel is in
man
mode.
Gain Limiting doesn’t just count how many mics are on; it actually sums the gains of
all the channels and compares them to a threshold. This also accounts for partially at-
tenuated channel gains. Gain Limiting sums the gain for all channels with
NOM
active
and reduces the gain to keep it below the threshold.
Conventional automatic mixing implementations always assume an NOM of 1. This can
be effected on the Dugan by setting the
NOM gain limit
pot to 1, which maximizes gain
for each mic. Activate the
NOM
switches for each channel you wish to be included in
the gain computation. The Master Gain Limiting display shows 3 dB of gain reduction
when two mics are on, 6 dB of reduction with four mics on, etc.
Figure 3-9
Gain
Reduction
(dB)
8 6 4 2 0
Number of Open Mikes
(NOM)
4
2
0
6
8
10