2-36
INSTALLATION ORBAN MODEL 8685
Note that even if the surround output is configured as AGC+LIMIT or
MB+L
IMIT, the output downmix is not consistently peak limited because
peak limiting is applied to the individual channels before the downmix.
Hence, the output downmix’s maximum permitted peak level becomes
higher when more channels are active. For example, when a given signal
appears in one channel (like Center), the downmix’s maximum peak level
will be 6 dB lower than it is when the same signal is appears equally in
two channels (such as Lf and Rf).
Moreover, the output downmix will not have fully controlled loudness
because the 8685’s loudness controller and Loudness Level meter use an
r.m.s. summation of the channels, whereas the output downmix is an
arithmetic sum. If you need a downmix whose loudness is perfectly con-
trolled and whose maximum peak level is fixed, use the 2.0 processing
chain #1 to control loudness and peak levels by assigning its input to the
input downmix. In this case, the loudness at the 2.0 processing chain’s
output will correctly track the 8685’s active 2.0
DIALNORM value.
LOCATE to INPUT/OUTPUT > CHANNEL MODE. You will see controls that determine the
contribution of the various surround channels to the two downmixes, normal-
ized so that the left front and right front are mixed at 0 dB.
• The default is –3dB for all inputs.
• The center is mixed equally into the left and right 2.0 downmix channels. All
other channels are assigned only to left or right.
• The mixer settings apply identically to downmixes (1) and (2).
• To make different sets of mix parameters available, save each mix in a Setup
and recall the Setup when required.
17. Set the 2.0_1 processing’s response to AES3 status bits.
See step (B) on page 2-18.
18. Choose
whether the 8685 2.0_1 output will emit status bits depending
on whether the 8685’s 2.0 processing is in stereo or dual mono mode.
See step (C) on page 2-18.
19. End Analog and Digital I/
O setup.
If you are using a external AGC and you temporarily set the E
XT AGC to NO in
step 2 on page 2-20, set the E
XT AGC to YES.
20. Select a processing preset.
See step (10.C)) on page 2-15.
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