Crown Audio IQ-USM 810 - Manual (Page 21)

Page 21
IQ-USM 810 IQ Digital Processor / Digital Mixer
IQ-USM 810 Reference Manual
calculation, set the weighting factor to zero; to
compensate for a mic in a relatively noisy loca-
tion set the weighting factor to a value between
zero and one. Control range is from 0 to 1 in 0.1-
step increments.
• Gate Threshold Ambient Offset: sets the amount
above the calculated ambient level for the gate
threshold. For inputs with ambient weighting fac-
tors equal to zero or one, the actual gate threshold
will be offset from the calculated ambient level by
this amount. For inputs with ambient weighting fac-
tors between zero and one, the offset is expanded
prior to adding it to the calculated ambient level –
the smaller the weighting factor, the larger the ex-
pansion. Control range is from 0 to 20-dB in
1 /
2
-dB
steps.
• Ambient Level Meter: indicates the calculated
ambient level.
4.3.7 A/B Processing Section Filters
The signal from all A/B Processing Sections can be
filtered with any combination of up to seven different
filter types. See Section 4.3.1 for filter descriptions.
4.3.8 Input Signal Muter/Inverter
the signal from all A/B Processing Sections can be
independently muted and/or inverted. The Mute function
typically provides –100 dB of attenuation.
4.4 Matrix Mixer
The IQ-USM 810 is an 8x10 mixer with unique dual
input processing paths (See Figure 5.2). Each of the
balanced inputs are split into two separate "A/B" pro-
cessing sections for a total of sixteen input signal
processing paths.
The matrix mixer outputs are routed to the two Main
outputs and eight Aux outputs. The signal from either
processing section A or B of each input may be routed
to any output. For example, the signals from processing
sections 1A, 2A, 3B and 4B might be mixed together on
AUX 1 output, but the signals from processing sections
1A and 1B could not be mixed together on the same
output.
The A/B Processing Sections make it possible to pro-
cess each input two different ways. For example, if an
input were to be routed to a PA system and also
recorded, it might be desirable to use the signal from
processing section A for the PA system and the signal
from processing section B for recording. Figure 4.3
provides a simplified example of signal flow from input
to output of one channel.
Note: The following features are controlled and
monitored via IQ for Windows software. Refer
to Figure 5.2, IQ-USM 810 Signal Flow Block
Diagram for feature locations in the audio sig-
nal chain.
4.4.1 Input Solo
A control for each A/B Processing Section that allows
the signal to be monitored independently by muting all
other inputs when the control is activated. A control is
also provided to un-mute all inputs.
4.4.2 Main A/B Mix Bus Faders
Controls the signal level from each A/B Processing
Section before the Main Mix Busses. Control range is
from –100 to +20.
4.4.3 AUX Mix Bus Input Selectors
Selects Processing Section A or B signal to be mixed
into each AUX output.
Figure 4.3 Signal Flow Through Matrix Mixer, one channel