Data Sheet-3
AD 22d Block Diagram
Application Information
SENSITIVITY
To ensure optimal performance, adjust the Sensitivity control
so its indicator points to the nominal input signal level. Signal
present and Clip indicators provide verification that the signal is
within the optimal range. The Sensitivity control adjusts the in-
put and output signal so that the AD 22d is always at unity gain.
SETTING DELAY
There are two modes for setting Delay in the AD 22d: setting
one channel at a time and setting
both
channels simultaneously.
To set a single channel’s Delay, press the Channel button until
the LEDs indicate the Channel you want to set (1 or 2). Then
press the up/down buttons until the display shows the desired
Delay. When editing
both
channels simultaneously (both Chan-
nel 1 and 2 LEDs
on
), the display shows the
smaller
of the two
current Delay values. In this mode, the two current Delay values
are “locked” together. Adjusting the up/down buttons changes
both values by the same relative amount. The
edit both mode
allows easy stereo editing and also allows both drivers of a pre-
aligned cluster to be moved forward or backward simultaneously.
STORING DELAY
Press the Store button. This stores
both
current Delay val-
ues into each channel's current Memory. A channel's current
Memory is indicated by the Memory LED lit when editing that
channel. The Store LED stops flashing when the current Delay
values match the stored values.
RECALLING DELAY
Pressing the Recall button alternately recalls stored Memories
(A then B then A…) for the selected channel(s) only.
SETTING TEMPERATURE
Hold down Display Mode and press the up/down buttons to
edit the AD 22d’s temperature setting. The 1 ms/Coarse buttons
display temperature in degrees Celsius, the 10µsec/Fine buttons
display degrees in Fahrenheit. No matter which unit (°C or °F),
adjustments are always in 1°C steps (or 1.8°F). The AD 22d does
not change the current Delay
times
for different temperature set-
tings;
only the displayed
distance
values are altered.
(See example
below.)
REMOTE RECALL
A switch wired to the Remote Recall terminals allows remote
recall of stored Memories for each channel. Wire directly to a
room divider latch to automatically recall the two room configu-
rations. Or store one Memory with the speaker stack’s distance
at one temperature and store the other Memory with the stack’s
distance at another temperature. Then, during the warmer part
of the day, restore the warmer temperature.
For example, set up the initial temperature for 71.6°F (the
default), and set the stack’s distance for 250.00 feet. Press Store
to save this value in Memory A (250.00 feet at 71.6°F is 220.85
msec). Then change the temperature setting to 100°F, and we’re
in Arizona. Notice that the current distance changes to 257.11
feet, but the current Delay
time
is
still 220.85 msec
. Now, edit the
current value for 250.00 feet (still your stack’s distance). Press
Store to save this value in Memory B (250.00 feet at 100°F is
214.74 msec.) Now Memory A has the proper value for the stack
at 71.6°F (220.85 msec/250 ft.), and Memory B has the value for
100°F (214.74 msec/250 ft.).
CH 1
CH 2
GND
REMOTE
DSP
LOCKOUT
PROM
AND
EEPROM
MEMORY
PANEL
DELAY
FRONT
CONTROLS
A/D
D/A
RFI
0dB
FILTER
+
-
12dB
SIGNAL / CLIP
SENSE
CLIP
SIGNAL
SENSITIVITY
3
2
1
INPUT
Channel 1 Shown, Channel 2 Identical
+
-
12dB
+
-
0 dB
BYPASS
BYPASS
RELAY
3
1
2
OUTPUT
