Niles AB-2D Istruzioni operative originali

AB-2D

INSTALLATION & OPERATION GUIDE

NILES

MODEL

AB-2D

SPEAKER A,B OR A+B SELECTOR

AB-2D

Introduction

The AB-2D is a wall-mount, Decora®style A, B or A+B speaker

selector. The unit has one amplifier input and two speaker

pair outputs. With the AB-2D, you can select an amplifier to

play into either pair of loudspeakers (A or B), or both pairs

simultaneously (A+B).

Features and Benefits

The AB-2D offers a number of improvements over other A-B

selectors.

●Interchangeable Decora inserts for fast, easy color change.

Inserts and buttons (sold separately) are available in a vari-

ety of colors.

●Self-cleaning, silver-plated switch contacts assure many

years of trouble-free use.

●Printed circuit board design uses no hand wiring, assuring

high reliability.

●The circuit board connectors can accommodate up to 14

gauge wire, making the AB-2D compatible with most

“high definition” speaker cables.

TABLE OF CONTENTS

Introduction 1

Features and

Benefits 1

Installation

Considerations 3

Installation 8

Operation 10

Specifications 10

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AB-2D

Speaker/Amplifier

Selector

●100% tested, electronically and acoustically, for frequency

response, distortion and power handling.

●Isolated left and right channel grounds make it safe for use

with any amplifier.

●May be used with 4, 6, or 8 ohm speaker systems.

●Ideal for both home and commercial sound installations.

●Only screwdriver and wire stripper required for installation.

●Power handling: 600 watts/channel continuous power

(RMS).

●Frequency response: Flat from 20 Hz to 20 kHz.

●Available colors: White, Bone, Almond, or Black.

●Ten year parts and labor warranty.

●Proudly made in the USA.

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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 1/2". When installed,

the unit extends 2" behind the sheetrock wall (assuming 1/2"

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,

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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.

the use of a p-ring may be inappropriate, such as in a retro-fit

(existing) installation, or when building codes require that

wall devices be enclosed in electrical boxes. Contact your local

building code and inspection department if unsure.

Type of Speaker Wire

For most applications, we recommend you use 16 or 18

gauge, stranded copper speaker wire for the AB-2D connec-

tions. For wiring runs longer than 80 feet, 14 gauge wire is

recommended. Using speaker wire larger than 14 gauge for

the AB-2D connections is not recommended—the wire may

not fit into the connectors. Never use solid-core, aluminum,

or "Romex" type wire with the AB-2D. When running speaker

wires inside walls, most states and municipalities in the U.S.

specify that you must use a special type of speaker wire.

Usually, the requirement is that the wire has a specific "CL"

fire rating, such as "CL-2" or "CL-3". Consult your Niles deal-

er, building contractor, or local building and inspection

department if unsure about which type of wire is best for

your application.

AB-2D Mounting Location

Convenient mounting locations for the AB-2D are:

●Near entry-ways or exits

●Near a desk

●At your bedside

●Close to a telephone 4

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"TECH TIP"

Wire size is

expressed by it's

AWG (American

Wire Gauge)

number. The lower

the AWG number,

the larger the wire,

i.e., 12 AWG wire is

physically larger

than 14 AWG.

●Near other wall controls (see caution below)

DO NOT INSTALL THE AB-2D INTO ELECTRICAL BOXES

WITH 110 VOLT DEVICES.

Some states or municipalities allow devices such as the AB-2D

to be installed into the same electrical box as 110 volt

devices, provided a "low-voltage partition" is used between

the devices. We do not recommend this. Speaker wires can

act as an "antenna" for electrical noise. Locating speaker wires

too close to a light switch or dimmer may cause a "popping"

or "buzzing" sound to be heard through the speakers. If you

must locate the AB-2D near electrical devices, install it in a

separate metal electrical box, ground the box to the electri-

cal system ground, and route the speaker wires several feet

away from the electrical wiring.

Changing the Color of the AB-2D

The Decora insert and buttons on the AB-2D are removable,

allowing fast and easy color changes as needed. Inserts and

buttons are available in a variety of colors.

If you need to change the color of the AB-2D:

1. Obtain the AB-2D Decora insert and buttons in the

desired color from your Niles dealer.

2. Holding the AB-2D as shown in (Figure 1), locate the two

plastic mounting tabs at the top rear of the Decora insert.

Using two fingers, simultaneously press both tabs down

(towards the center of the insert) and forward (away from

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you) until the insert pops free from its mounting slots.

3. Hold the AB-2D as shown in (Figure 2). Remove both

buttons from the switches using your fingers. DO NOT use

pliers or other tools as these may damage the buttons.

4. Locate the new Decora insert. Hold the AB-2D so that it

is facing you. Insert the two bottom tabs into the bottom

slots first, followed by the two tabs on the top. Snap the

insert into place by carefully pressing on the front of the

insert.

5. Locate the new buttons. Secure the buttons to the

switches by gently pressing them into place.

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Figure 2

Removing the

Button

Figure1

Removing the

Decora-style Insert

"TECH TIP"

Do not exert

excessive pressure

on the plastic

mounting tabs.

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(a) Electrical Box

(b) Speaker Wire

(d) Snap-on Color Insert (supplied)

(e) Buttons (2 supplied)

(f) Device Screws (2 supplied)

(g) Decora Faceplate (supplied)

(h) Faceplate Screws (2 supplied)

Installation

If you are installing the AB-2D into an existing wall, take time

to consider any possible obstructions which may be hidden

inside the wall, such as wood and metal studs; electrical, tele-

phone or other types of wiring; plumbing; conduit; old

wall safes; etc.

1. Install the electrical box or p-ring in the usual

manner.

2. Run all the necessary wiring to the AB-2D. Label the

wires for future reference.

3. Make the connections to the AB-2D. Strip 1/4" of

insulation from the end of each wire. Tightly twist the

end of each wire until there are no frayed ends. Insert

each wire into the appropriate hole on the connector

blocks; secure the wiring to the connectors by tighten-

ing the small connector screws. Be certain that proper

phasing is observed—connect the positive terminals

on the AB-2D to the positive terminals on the amplifier

and speakers and the negative terminals on the AB-2D

to the negative terminals on the amplifier and speakers.

See (Figure 3).

The input of the AB-2D is the connector labeled "AMP".

The outputs are the connectors labeled "A" and "B". Be

sure not to reverse any of these connections or the AB-2D

will not function properly.

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AB-2D

Speaker

Pair B Speaker

Pair A

Receiver

Figure 3

Wiring Diagram

4. Secure the AB-2D to the electrical box or p-ring. Insert the

1 1/4" long device screws into the oblong-shaped screw holes

on the top and bottom of the AB-2D. Note that the oblong

shape of the screw holes allow you to position the AB-2D so

that it is vertical. Position the AB-2D so that the screws are

aligned with the threaded holes in the electrical box or p-

ring. Tighten the screws using a phillips screwdriver. DO

NOT OVER-TIGHTEN. In some instances, you may need to

loosen these screws several turns to allow the AB-2D to fit

flush with the Decora cover plate. See (Figure 4).

5. Use the shorter plate screws to fasten the Decora cover

plate to the AB-2D. DO NOT OVER-TIGHTEN THE PLATE

SCREWS OR YOU MAY DAMAGE THE COVER PLATE. Line up

all the screws in the same direction for a finished look.

NOTE: Certain "old work" or "retro-fit" boxes, such as the

Carlon B225R, have a plastic "lip" which interferes with the

Decora plate screws. This lip prevents you from being able to

tighten these screws completely. To make the clearance nec-

essary for these screws, you must remove the parts of the lip

causing the interference. There are two ways to accomplish

this:

1. Drill through the lip of the box at the screw points.

2. Cut notches into the lip with a pair of diagonal cutters.

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Figure 4

Loosening the Screws

for a Flush Fit

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