Manual-2
FRONT PANEL DESCRIPTION
PRIORITY GAIN trim and OL indicator:
adjusts the gain for the PRIORITY INPUT. Set this trim to prevent overload-
ing the Input — if the Priority Gain OL illuminates, turn down the GAIN.
PRIORITY DETECT trim and ACTIVE indicator:
sets the threshold in dBu for the PRIORITY INPUT to override the
LINE INPUT. When the threshold has been reached, the ACTIVE indicator illuminates.
Set the GAIN
(
),
then set the
DETECT trim
. The range of operation is +4 dBu to ON. The release time for the auto-detect circuit is fixed at about 6
seconds, after which the LINE INPUT signal returns to it's previous level.
PRIORITY DUCKER trim:
sets the amount of attenuation applied to the LINE INPUT signal when the PRIORITY
INPUT is activated by the DETECT threshold. DUCKER depth is continuously adjustable over a range of 0 dB to –80 dB.
For equal mixing of PRIORITY and LINE, set the DUCKER to 0 dB. For PRIORITY replaces LINE operation, use –80 dB.
A value of –12 dB (1 o’clock) is typical for PRIORITY (page) talks over LINE (music) operation.
AGC TARGET LEVEL trim:
is best set so the average signal at the LINE INPUT reads 0 dB on the GAIN meter. This
gives the best performance of the AGC (Automatic Gain Control). Active constant gain range of the AGC is ±12 dB (24 dB
range). When the Input falls 26 dB below the AGC Target Level, gain returns to unity. See
Setup and Operation
, step 2.
AGC RATIO trim:
determines the Ratio applied to the AGC with a soft-knee response. Increased clockwise rotation
increases the amount of AGC. The full counter-clockwise position disables the AGC. The normal range of operation is
between 2:1 and
∞
:1 as marked by the gray band.
AGC SLOW/FAST release switch:
determines the gain reduction time constant of the AGC circuit. SLOW = 230 ms (best
for music), FAST = 11 ms (best for voice). The gain increase time constant is fixed at 1100 ms.
AGC GAIN meter:
indicates the amount of AGC applied to the LINE INPUT. The 0 dB GAIN indicator is off if the Input
is more than 26 dB below the Target Level.
CROSSOVER FREQUENCY switch and indicators:
select the FREQUENCY for the 2-way Crossover when High-Pass
and/or Low-Pass outputs are used (80, 110,150 or 200 Hz). High, Low or Full-Range is selectable for each of the six
Outputs.
OUTPUT trims and Crossover select switches:
The ±12 dB trims set the levels for each of the six Outputs. High, Low or
Full-Range is switch selectable for each of the six Outputs.
Note: the Output trims do not affect Low-pass loudness
compensation or Priority Input level.
See Setup and Operation, step 5.
POWER indicator LED:
This yellow illumination device lights up to let the operator know the thing is plugged in.
