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AD 22 & AD 22B Block Diagram
Application Information
SENSITIVITY
Adjust the Sensitivity control so its indicator points to the
nominal input signal level. This ensures optimal performance.
Signal present and Clip indicators provide verification that the
signal is within the optimal range. The Sensitivity control
adjusts the input and output signal so that the AD 22 or AD
22B is always at unity gain.
SETTING DELAY
There are two modes for setting Delay in the AD 22 and
AD 22B: 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 Channel 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
values 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 22B'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 22B does not change the current Delay times
for different temperature settings; 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 configurations. 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.).
Data Sheet-3
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