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A-K4

Amplified Keypad with Multisource Capability

for A-BUS® System

Installation Manual

A-K4 Overview

The Russound A-K4 is an in-wall amplified keypad used

with A-BUS hubs and controllers in a distributed audio

system. It can be used with both single and multisource

A-BUS hubs/controllers. The A-K4 provides source selec-

tion and control with backlit push buttons, plus an IR

window to receive remote control signals.

The volume up/down buttons control the speakers in

the room that are connected to the A-K4. Typical installa-

tions place one A-K4 in each room of the A-BUS system.

The Line Out connection on the A-K4 can be used to

feed a separate powered subwoofer or to connect an

external amplifier for more power to a larger listening area.

A-K4 Key Features

• Power On/Off button (acts as source select with

multi-source hubs/controllers)

• Volume trims for L/R balance and maximum level

settings

• Built-in IR receiver with IR confirmation LED

• IR control of settings and sources via A-LRC2 optional

remote

• Line Out connection for external amp or powered

subwoofer

• White backlit buttons

A-K4 Specications

Output Impedance: 8 ohms/channel (1 pair speakers)

Input Impedance: 10 kohms

Power Requirements: +24VDC 660mA peak

CAT-5 Connections: RJ-45

Dimensions (in-wall): 1.75”W x 2.875”H x 1.75”D

(45x73x45mm)

Weight: 5.5oz. (160g)

Safety Instructions

1. Read Instructions - All the safety and operating instructions

should be read before the appliance is operated.

2. Retain Instructions - The safety and operating instructions

should be retained for future reference.

3. Heed Warnings - All warnings on the appliance in the oper-

ating instructions should be adhered to.

4. Follow Instructions - All operating and user instructions

should be followed.

5. Water and Moisture - The appliance should not be used

near water; for example, near a bathtub, washbowl, kitchen

sink, laundry tub, in a wet basement, or near a swimming

pool.

6. Wall or Ceiling Mounting - The appliance should be

mounted to a wall or ceiling only as recommended by the

manufacturer.

7. Heat - The appliance should be situated away from heat

sources such as radiators, heat registers, stoves, or other

appliances (including amplifiers) that produce heat.

8. Power Sources - The appliance should be connected to

a power supply only of the type described in the operating

instructions or as marked on the appliance.

9. Grounding or Polarization - Precaution should be taken so

that the grounding or polarization means of an appliance is

not defeated.

10. Object and Liquid Entry - Care should be taken so that

objects do not fall and liquids are not spilled into the enclo-

sure through the openings.

11. Damage Requiring Service - The appliance should be ser-

viced by qualified service personnel when:

The power supply cord or the plug has been damaged;

Objects have fallen, liquid has been spilled into the

appliance

The appliance has been exposed to rain

The appliance does not appear to operate normally

The appliance has been dropped or the enclosure is

damaged.

12. Servicing - The user should not attempt to service the

appliance beyond that described in the operating instruc-

tions. All other servicing should be referred to qualified ser-

vice personnel.

13. Care – From time to time you should wipe off the front

panel with a soft dry cloth.

Russound, Inc. 1 Forbes Rd., Newmarket, NH 03857, USA

tel 603.659.5170 • fax 603.659.5388 www.russound.com

technical support: 866.888.7466 e-mail: tech@russound.com

28-1376 03.08.16, Rev.2

are the property of their respective owners. Russound is not

responsible for typographical errors or omissions. Specications

are subject to change without notice.

A-BUS is a registered trademark of LeisureTech Electronics Pty

Ltd Australia. This product may be covered by one or more of the

following patents: US #7,181,023, #6,389,139; EP #1004222, AU

#739808, NZ #502982, Mexico #241196, Canada #CA2301062.

Warranty and Repair

The Russound A-K4 is guaranteed against all defects in materials and

workmanship for two (2) years from the date of purchase. During

this period, Russound will replace any defective parts and correct any

defect in workmanship without charge for either parts or labor. For

this warranty to apply, the unit must be installed and used according

to its written instructions. If service is necessary, it must be performed

by Russound. The unit must be returned to Russound at the owner’s

expense and with prior written permission. Accidental damage and

shipping damage are not considered defects, nor is damage resulting

from abuse or from servicing by an agency or person not specifi-

cally authorized in writing by Russound. This Warranty does not cover:

Damage caused by abuse, accident, mis-use, negligence, or improper

installation or operation; Power surges and lightning strikes; Normal

wear and maintenance; Products that have been altered or modified;

Any product whose identifying number, decal, serial number, etc.

has been altered, defaced or removed. Russound sells products only

through authorized Dealers and Distributors to ensure that customers

obtain proper support and service. Any Russound product purchased

from an unauthorized dealer or other source, including retailers, mail

order sellers and online sellers will not be honored or serviced under

existing Russound warranty policy. Any sale of products by an unau-

thorized source or other manner not authorized by Russound shall

void the warranty on the applicable product.

Damage to or destruction of components due to application of exces-

sive power voids the warranty on those parts. In these cases, repairs

will be made on the basis or the retail value of the parts and labor. To

return for repairs, the unit must be shipped to Russound at the owner’s

expense, along with a note explaining the nature of service required.

Be sure to pack the unit in a corrugated container with at least three (3)

inches of resilient material to protect the unit from damage in transit.

Before returning a unit for repair, call Russound at 866.888.7466 for

a Return Authorization number. Write this number on the shipping

label and ship to: Russound, ATTN: Service, 1 Forbes Road, Newmarket,

NH 03857.

A-K4 Keypad Front Panel Operation

Volume Level - Volume level indicator LEDs light up from

bottom to top to indicate volume level. Also indicates

source selected (1-6) when in “multi-source” mode.

Status LED - Green LED lights to show Status “on” and turns

off when Status is “off”

Power - Turns zone ON when pressed once. (In multisource

mode, when ON, press and hold will turn zone OFF. When

OFF, press and hold will turn OFF all zones.) Status LED

remains lit when keypad/zone is OFF if any other zone in

system is ON.

Source select (Multisource controller) - When the keypad

is set in “Multisource” mode, the power button is used to

toggle through and select a source. Tap the power button

to toggle between 1 and 6 multiple sources (once power is

on). The top LEDs of the volume indicator show (from top

to bottom) the source that is selected (top LED is source 1,

next LED down is

source 2, etc).

Volume Up/Down - Raises/lowers room volume

IR Receiver - Receives IR signals from a remote control.

Source components attached to IR emitters in an A-BUS

system can be controlled with their own remote controls or

A-LRC2 learning remote aimed at the A-K4.

IR Confirmation LED - Red LED blinks to confirm IR signal

reception.

A-K4 Keypad

A-K4 new_Manual.indd 1 3/8/16 1:37 PM

A-H484

P75 Power amplier

Note: Amplified keypads are shipped with the Status LED

option disabled (default).

Status function and operation:

When the source is powered on, the Status circuit is

green. This indicates to the user that the source is on and

ready to receive remote control commands.

When the source is powered off (remotely or manually),

it shuts off the 12VDC Status power connected to it, and

turns off all the interfaces connected to the controller

(green LED off).

6 Gain Control for Maximum Levels

The two rotary trim potentiometers on the side of the

A-K4 provide adjustment of audio gain. These are used to

set the maximum allowable volume for the left and right

speakers connected to the A-K4.

7 Keypad Connections

The A-K4 can be used with any A-BUS hub/controller.

The sample wiring diagram shown is for the A-H484.

Each keypad connects to a Keypad Output port on the

hub/controller. Connections are made using CAT-5 cable

with an RJ-45 connector using T568A CAT-5 cable con-

figuration. CAT-5 cable length should be no longer than

150 feet from controller to keypad.

For a clean installation when wiring from a Keypad Port,

use an RJ-45 CAT-5 patch cable to connect from the key-

pad port to an RJ-45 wall plate (optional). Using the same

RJ-45 T568A CAT-5 wiring configuration, use CAT-5 from

the RJ-45 wall plate to the keypad.

8 Installation

Check all connections and test the system’s operation

before installing the A-K4 into the wall. Using the includ-

ed hardware, install the A-K4 into a standard UL/CSA

single-gang electrical J-box.

1 RJ-45 Connector for CAT-5 Connection

The RJ-45 input provides a connection for the CAT-5

cable from an A-BUS hub/controller to receive an audio

signal, passthrough IR and power over the CAT-5 cable.

Use the T568A wiring standard. The recommended maxi-

mum length for standard CAT-5 cable is 150 feet.

Before connecting the A-K4, disconnect the power sup-

ply from the A-BUS hub/controller and disconnect the

Status power supply if used.

2 Line Out Connector for External Amplication

The Line Out provides a variable line-level audio output

connection for an external amplifier or powered sub-

woofer. An amplifier provides more power to a large

listening area, and a powered subwoofer adds extended

bass response.

Use 22AWG four conductor, two-pair twisted shielded

cable to connect to the Left positive (+) and negative (-),

and Right positive (+) and negative (-) screw down termi-

nals on the back of the A-K4.

Terminate the four conductor two-twisted pair shielded

cable to the rear solder lugs of a wall plate fitted with

two RCA jacks on its front. Terminate the shield at the

Right negative (-) or Left negative (-) ring of the solder

lugs. RCA cables can be used to connect the amp or sub-

woofer to the wall place for audio signal feed.

3 Speaker Output Connector for Speakers

The Speaker Output connections provide speaker-level

audio output for a pair of 8-ohm speakers. The screw-

down terminals accept up to 16 gauge speaker wire.

4 Source Mode Jumper for Single/Multisource

The single/multisource jumpers set the A-K4 to be used

with either single- or multi-source A-BUS hubs/control-

lers. The jumpers and pins are located under the face-

plate on the right side of the keypad (facing front).

The pins are jumpered to select between 1, 4 and 6

sources. 1 source = no jumper; 4 sources = top two pins

jumpered; 6 sources = bottom two pins jumpered.

5 Status Jumper for Status LED Enable/Disable

The Status option provides visual indication when source

equipment is powered on. With this option enabled, the

status LED shows green on the keypad when the system

is on (keypad can be on or off).

To enable the Status LED, locate the status pins on the

right side of the keypad under the faceplate. Place the

status jumper over the bottom two pins to enable the

status LED.

NOTE: Use caution when connecting speaker wires, as shorting between terminals will cause damage to the digital amplifier and

void the warranty.

CONNECTION INSTRUCTIONS FOR A-K6L. REFER TO NUMBERED DIAGRAM ON THE RIGHT CONNECTION DIAGRAM FOR A-K4. REFER TO NUMBERED INSTRUCTIONS ON LEFT. DIAGRAM NOT TO SCALE.

Note: This equipment has been tested and found to comply