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Mount the AD-C820 or AD-C821 Loudspeaker System
Note: The Mounting Clamps are part of the assembly and allow for mounting surfaces (ceiling) up to 2.75" in thickness. Do not install the grille until
clamps have been tightened and any adjustments made.
1. Before inserting the loudspeaker into the mounting hole or AD-C-800BB back box, adjust the Mounting Clamps counterclockwise, using a Phillips
screwdriver, so they are folded in against the loudspeaker backcan and provide enough space for the thickness of the ceiling to which you are
mounting the loudspeaker. (Figure 19) item b.
Note: Turning the Mounting Clamp Screw counterclockwise increases the space (loosens), and folds the Mounting Clamp next to the loudspeaker
back can. Turning the screw clockwise folds the Mounting Clamp out, and reduces the space (tightens).
2. Install the loudspeaker system into the ceiling through the mounting hole, or into the AD-C800BB back box.
3. Tighten each clamp using a #2 Phillips screwdriver 7 in·lbs. (Figure 19) item a.
Important: Excessive torque may cause mounting tab and/or ceiling damage. Do not over-torque (20 inch-pounds maxs). If the Mounting
Clamps have been subject to extreme temperatures, Do Not Tighten until they have reached room temperature.
Note: (Figure 19) shows the AD-C821, the AD-C820 has the same Mounting Clamps, it does not have the back can as shown in the figure.
b
a
a
a. Mounting Clamps shown in down and out position
b. Mounting Clamp shown in up and in position
Set Transformer Tap and Install Grille
http://www.qscaudio.com/support/resources/Amplifier_Matrix_Spreadsheet_with_speaker_calculator_v3.xls
1. Set the tap selector switch to the desired position.
a. Do not use N/A setting for 100V systems.
b. For 16 ohm systems, set the selector to the 16 ohm position.
OFF
100
50
25
100V
70V
12. 5
OFF
N/A
100
50
25
16
16
100 Volt 70 Volt
16 Ω 16 Ω
Off Off
N/A 100
100 50
50 25
25 12.5
– Figure 19 –
– Figure 20 –