11
EN
TD-000077-00-K
Gain Controls
Refer to Figure 22 and Figure 23.
The Gain controls are recessed and can be adjusted with a small screwdriver or flat
tool. If desired, the Gain Control Security Cover can be installed to prevent changes
to the installer's settings.
Turn the gain controls clockwise to increase gain and counter clockwise to decrease
gain. The maximum voltage gain of the amplifier varies depending on the model
designation. Maximum voltage gain for each model is shown on the front panel
label in parentheses adjacent the 0dB attenuation setting.
The Gain controls are marked in dB of attenuation. There are 21 detents for
repeatable adjustments. The upper 14 steps are about 1 dB each, and settings should
normally be made within this range. The range below -14 dB should not be used for
normal program levels, as the input headroom could be exceeded, but can be used
for testing at reduced levels. At the minimum setting, the signal is completely cut off.
Gain Control Security Plate
The cover blocks access to the Gain settings. The LED indicators are still visible to
monitor the system's operation.
1. Use a 9/64" or 3.5 mm hex driver to loosen the screw several turns. Do not remove it completely.
2. Slide the right end of the cover under the loosened screw.
3. Insert the left end tabs into the last row of ventilation slots, and slide the panel fully to the right. It should lock into the slots.
4. Confirm that the LED's are visible through the cover. Tighten the hex screw carefully.
— Figure 24 —
Two-Channel Models
— Figure 22 —
Four-Channel Models
— Figure 23 —
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