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S S
P P E E A A K K E E R R
TOOLS
REQUIRED
• No. 2 Phillips
Screwdriver
• 1/8" Standard
Slotted Screwdriver
• 1/4" Standard
Slotted Screwdriver
• Wire Stripper
"TECH TIP"
Verify that the
impedance
presented to the
amplifier when both
speaker pairs are
selected is above
the minimum
recommended by
the amplifier
manufacturer.
3
/ / A A
M M P P L L I I F F I I E E R R
Installation Considerations
The AB-2D is a Decora-style module and is designed to use
standard Decora-style cover plates and mounting hardware.
Decora cover plates (up to 6-gang) with color-matched plate
screws are available from your Niles dealer.
Amplifier Impedance Load
When both pairs of speakers are selected on the AB-2D,
they are connected to the amplifier in parallel. This will
lower the overall impedance load presented to the amplifi-
er. For example, if two pairs of 8 ohm speakers are selected
on the AB-2D, their parallel impedance will be 4 ohms; 2
pairs of 4 ohm speakers in parallel become 2 ohms, and so
on. The AB-2D does not provide impedance protection for
the amplifier. Consult your Niles dealer if you are unsure
about your amplifier's low impedance drive capability. A
Niles impedance protection device may be required.
P-Rings and Electrical Boxes
The mounting depth of the AB-2D is 2
the unit extends 2" behind the sheetrock wall (assuming
sheetrock). For installation, you must choose between a stan-
dard light switch plaster ring (p-ring) or a standard 18 cu. in.
(or larger) electrical box. Suitable p-rings and electrical boxes
are available from your Niles dealer or local electrical supply
company. Using the p-ring is best because it gives you unob-
structed access to the full depth of the wall. In some instances,
S S
E E L L E E C C T T O O R R
". When installed,
1/2
"
1/2
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