Axium AX4752 User manual

INSTALLATION & OPERATION
MANUAL
AX4752
Multi-Zone Audio/Video amplifier
Four Zone, Seven Source, 50W Per-Channel
Total In Home Connectivity
12:18 Master Bed
On <Vol5 0> DVD
12:18 Master Bed
On <Vol5 0> DVD

Congratulations!
You have purchased one of the most advanced, dedicated multi-room amplifiers on the
market. he AX4752 like other Axium products is designed to maximize control, simplify
functionality, & expedite installation. Axium products are built to the highest standards of
quality and reliability.
o view Axium’s product line of multi-room amplifiers, controllers, & accessories please
visit the Website at www.axium.co.nz
able Of Contents
IN RODUC ION ………………………………………………………………….………………1
FEA URES……………………………………………………………………………………………2
INS ALLA ION GUIDE….…………………………………………………………….……….4
FRON PANEL GUIDE……...………………………………………………………….……..5
REAR PANEL GUIDE…………..…………………………….………………………….………6
YPICAL SYS EM CONFIGURA ION …………………………………………….………7
CON ROLLER ERMINA ION……………………………………………………………….9
ADVANCED IR CON ROL……………………………………………………………………..10
MUL IPLE AX4752 S ACKS………………………………………………………………….11
ZONE LINKING………………………………………………………………………………………12
AU OMA ION……………………………………………………………………………………….13
RS232 PRO OCOL………………………………………………………………………………..14
MENU NAVIGA ION……………………………………………………………………………….17
PROGRAMMING USING AMC………………………………………………………………….20
SPECIFICA IONS…………………………………………………………………………………..26

IN RODUC ION
he AX4752 multi-zone audio/video amplifier combined with Axium controllers, and/or a
home automation system enables you to individually control the power, volume and source
selection in up to four rooms, with four Sub-zone preamplifier outputs available.
Axium multi-zone amplifiers may be interconnected via the expansion bus, providing up to
32 zones of control which vastly simplifies installation cabling.
An RS232 & USB interface may be used to control & monitor the amplifier either from a PC
or building management system.
Axium Keypads are IR Learning and include a host of features to simplify / enhance the
amplifier and source equipment control. Such features include amplifier feedback of
Power, source select etc, IR receiver pass through, macro and long press functions.
he IRFX Infra-Red receiver is plasma proof & sunlight tolerant utilizing Axium’s ‘Data-
stream filtered’ technology to provide the best possible IR system reliability.
A utility program called AMC is available on the product CDROM or Axium website.
AMC provides a simple user interface from a PC or Laptop, and provides control of all Axium
networked components.
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RISK O F FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
12 :18 Master Bed
On <Vo l50> DVD
SAT DVD VID AUX
L
R
+12V
AX-KPD KRXm and KRXs
DISC
1
4
2
5
3
6
987
0
-/-- AV
SELECT
GROUP RANDOM
CD MCD
AUX
TU
DMS DVD
VOL
MUTE
Axium
+
-
IRFX
- VOL VOL +
06 7 98
51 2 43
Skip
SET
C Tuner Cable
MS Aux V
Axium

FEA URES
Mulit-Zone , Multi-Source, Video Switching
he AX4752 has four separate preamplifiers and amplifiers, providing 4 zones of independent yet
integrated control.
here are seven stereo sources (SA , DVD, VID, AUX, CD, ape & uner) and an eighth mono source
(Utility) typically used for paging applications.
Each zone has an eight source composite video switcher, so screen’s in four different rooms may
display any of the eight sources (SA , DVD, VID, AUX, CD, ape, uner & Utility)
Preamplifiers and outputs
Each zone has bass, treble, balance and loudness control. hese are accessed either from the front
panel or AMC program.
he preamplifier output volume may be independent of the amplifier volume, or made to track the
amplifier with an adjustable offset (± 20dB). he tracking feature is great for passive subwoofer
control, while the independent volume feature is useful for limited control in close-coupled rooms.
A useful protection feature is ‘Maximum volume limiting’. his limits the maximum volume of either
the amplifier or preamplifier.
Amplifier Power, Protection, and Clipping indicators
50 Watts RMS per channel into 8 ohms, capable of driving into 4 ohms.
he amplifiers are protected against short-term output shorts.
here are three progressive levels of thermal protection:
1) An internal fan is turned on to aid cooling.
2) he amplifier volume is reduced 20dB.
3) he amplifiers are shutdown until the temperature reduces below the first level.
Care should be taken to ensure adequate ventilation – see “installation guide”
he front panel zone indicators will flash red when the zone amplifiers are overdriven into clipping.
USB, RS232 & IR Control
he AX4752 may be controlled and monitored via either the front Panel USB or rear panel RS232
serial interface.
In multi amplifier installations where the amplifiers are interconnected using an expansion bus cable,
only one USB or RS232 connection is required to control the stack of amplifiers.
An AX4752 may receive IR directly from the front panel receiver or via the two ‘Controller interface’
connections.
here are zone specific IR commands and also a set of global IR commands.
he commands are: ON, OFF, Standby (toggling), Mute, Amp Volume Up, Amp Volume Down, Pre
Volume Up, Pre Volume Down, SA , DVD, VID, AUX, CD, A, U, U ILI Y, On with Source specific
commands.
he Global commands also include; PRESE 1 – PRESE 6, Alarm Enable, Alarm OFF, & 5 minute Sleep.
Real time clock
he AX4752 is equipped with a real time clock.
he amplifier may be set up to function as an alarm clock, so that at 6.30am in the morning 5 days a
week, the master bedroom zone could be made to turn on, select tuner, and go to a specific volume.
Another application of the clock is temperature and event logging, providing a history of the amplifier
environment which aids servicing.
he clock continues to operate typically > 48 hours without power – more than enough to keep the
time current during lengthy power outages.
IR Emitter Ports
here are 4 Buffered IR emitter Ports.
wo IR ports have routing, and are linked to their respective ‘Controller Interface’ ports. hese ports
control zone specific source components.
wo IR ports are the sum of both IR sources; these control the all zone source components.
2

Presets & Paging
here are six amplifier presets, and a ‘page preset’.
Presets 1 - 6 are momentary and cause the amplifier to go to a predetermined setup, i.e. standby,
volume & source selection. he presets may also be programmed with event scheduling, and are used
by the alarm clock feature.
he ‘page preset’ mode is for paging applications and is invoked by a contact closure between the
‘0V’ and the ‘PG’ terminals. When the contact closure is released the amplifier zones return to their
previous states.
Zone Linking
A zone may be programmed to link one other zone. Zone linking ties the source selection together. It
may also tie the volume, and standby. his is useful for closely coupled audio areas where it is
advantageous to have different volume control but the same source, or the same volume with
separate standby control. Zone linking is setup either via the front panel user interface or by the AMC
program.
32 Zones
here are 32 zones of possible control. On an AX4752 each zone must be different, however in a
multiple amplifier stack same zone amplifiers are possible – they simply mimic every parameter.
Expansion Bus
Data, IR, Amp-On & audio sources are interconnected via the expansion bus.
he expansion bus feature vastly simplifies the installation cabling of an Axium amplifier stack.
One amplifier is connected to another using a 34-way ribbon cable. Connections are made from the
output of the first amplifier to the input of the second etc.
All audio sources must be connected to the first amplifier.
Note: Video signals are not passed through the expansion bus.
Amplifier ON Status - “Amp-On”
Each zone has front panel ON status indication, and +12VDC outputs on the rear panel connector. (1,
2, 3, 4 & #) he # ‘AMP ON’ output is a logic ‘And’ output, i.e. if any of the zones are ON then the
output is +12V. his is useful for driving a relay that connects AC power to source equipment. he
‘AMP ON’ output’s are protected against shorts. he ‘AMP ON’ output default to tracking the
preamplifier ON status but may be set to track the amplifier ON status. his is set via the AMC
program.
Axium Bus
Axium Bus provides inter-amplifier control & amplifier status for the old style KRX membrane
Keypads.
he Bus is short protected. ( erminals C & D)
Power failure Restoration
After an AC power outage the AX4752 restores it’s settings to the pre-interrupted state. All internal
settings are stored in non-volatile memory, except the clock that runs for at least 48 hours on stored
power.
Restore factory defaults
Push and holding down the rotary encoder for > 10 seconds takes you to the setup menu, select
restore factory defaults, and press again. he amplifier will be reset to factory defaults, and the
memory cleared.
Firmware upgradeable
he AX4752 may be updated with the latest operational firmware, using Axium ‘Uploader 2’ program.
he ability to enhance the functionality of installed Axium product’s provides a degree of future
proofing, and flexibility.
3

INS ALLA ION GUIDE
UNPACKING
Immediately upon receiving your AX4752 inspect the carton for evidence of mishandling
during shipment. hen carefully unpack the unit and inspect for damage.
Please save the shipping carton and all inner packing materials in the event that the
AX4752 needs to be shipped for service or moved to a new location.
Should you discover that the AX4752 has been damaged during shipping please contact your
dealer immediately.
PRECAU IONS
1) Never expose the unit to moisture.
2) Avoid restricting the airflow around the AX4752. Good airflow is necessary to help
ensure proper operation. Not only should you provide enough free space around the
unit, but also ensure that air can flow freely and escape from the amplifier
surroundings. Failure to do so may cause thermal shutdown of the unit, or
intermittent channel cutout and reduced life expectancy. A thermal temperature
log is kept.
3) Under no circumstances should the speaker output terminals of the unit be short
circuited, or connected to another output.
4) Avoid plugging the RS232 cable into the unit while power is connected.
5) Never short the controller interface or 9 way controller terminals.
6) Avoid installing the AX4752 in positions where the front panel is exposed to direct
sun light. his may intermittently slow down the response of the unit.
7) Never connect more than four Axium controllers to the unit’s +12Vdc power supply
terminals. he supply is internally fused and will open circuit (self-resetting).
8) Never connect the AX4752’s +12Vdc power supply to an external power supply or
other Axium amplifier’s +12Vdc output.
4

FRON PANEL GUIDE
1 Front Panel: Solid Aluminum front Panel with Engraved Axium Logo.
2 Infra-Red Receiver: Receiver for front panel IR control – Not IR pass through!
3 LCD display: Back lit LCD display for menu guided control & programming.
he display is dimmed when all zones are OFF.
4 Rotary Encoder & Push Select: he display menus are navigated and selections made
using left and right rotation and pushes on the knob.
5 Zone Indicators: From Left to right zone 1 – 4. he indicators are blue when ON, and flash
red when the amplifiers are overdriven into clipping.
6 USB port: Front panel programming.
7 Chassis Feet: Set high enough to provide unrestricted airflow through the chassis for
convection cooling.
5
12:18 Master Bed
On <Vol50> DVD
4
57
31 2
6 7

REAR PANEL GUIDE
8 AC Power Socket: IEC socket, with integral fuse and power switch.
9 Speaker erminals: Plug in terminal clamp connectors accept 1.5mm² speaker wires
10 Preamplifier Outputs: Audio and composite video outputs. Gold plated RCA connectors.
11 RS232 Comm Port: DB9 connector. he port is used to setup, control or monitor the
AX4752. A null modem cable must be used when connecting to a PC or building management
system.
12 Expansion Bus Output: 34 way IDC header. Connects to the expansion bus input of the
next AX4752i amplifier in the stack.
13 Paging & Status erminals: 9 way Plug in terminal clamp connector.
A short between PG and 0V invokes the ‘Page’ preset, making possible telephone paging
through the multi-zone system.
AMP-ON 1, 2, 3, 4 provides +12VDC when the preamplifier or amplifier zone is ON.
AMP-ON # is +12VDC whenever any of the zones are ON.
erminals C & D are Axium Bus connections for operation of the Axium KRX membrane
keypads.
14 Controller Interface: 4 way green plug in terminal clamp connectors, used for connecting
to
Keypads & IR receivers. here are two controller interface ports each linked with an IR port
providing IR routing. he +12VDC output is internally fused (self-resetting), and has a
maximum loading of 4 Axium keypad’s or IR receivers. he ‘Data’ terminal sends amplifier
status to Axium keypads.
15 Routed IR Emitter Ports: 3.5mm mono phone jacks. IR1 & IR2 are used to control specific
source components. he ports only output IR strings received from their associated controller
interface.
16 IR Emitter Ports: 3.5mm mono phone jacks. he two jacks labeled IR1+IR2 are for control
of source components common to all zones. hey output the combined IR1 & IR2 IR strings.
17 +12VDC Center Positive Outputs: For powering the AX07S slave amplifiers.
18 Expansion Bus Input: 34 way IDC header. Connects from another Axium amplifiers
expansion bus output – provides connection of source component audio, control, & IR.
Note: Video does not go up the expansion bus lead.
19 Source Component Connections: Gold plated RCA jacks. Source component line level
and composite video inputs.
6
16
8 9 10 11 12
15 14
13
1819
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE TH E RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE T HIS UNIT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
17

YPICAL SYS EM CONFIGURA ION
Fig 1
7
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2. 5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RISK OF FIRE OR ELECT RIC
SHOCK DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
DMS player
Tuner
CD changer
DVD Player
VCR Player
SAT receiver To IR1
To IR1+ IR2
To IR2
To IR1 + IR2
Gym
StudyLounge
IRFX Receiver
Controller 1
interface Keypad
Controller 2
interface
DISC
1
4
2
5
3
6
987
0
-/-- AV
SELECT
GROUP RANDOM
CD MCD
AUXTU
DMS DVD
VOL
MUTE
Axium
+
-
Keypad
Controller 1
interface
CD MCD
AUX
TU
DMS DVD
VOL
MUTE
Axium
+
-
Keypad
Controller 1
interface
Zone 1 Zone 2
Zone 3 Zone 4
ACTIVE
SUB
Bedroom & Ensuite
AMP
CD MCD
AUXTU
DMS DVD
VOL
MUTE
Axium
+
-

ypical System Configuration:
Fig 1 depicts a typical configuration, where the AX4752 is providing audio into four listening zones.
Each zone consists of a room with a pair of speakers, and a suitable controller. Additionally a zone
may require V’s or screens. In Fig 1 three such screens are shown in the Lounge, Gym, and Bedroom.
Each zone may be listening / watching any of the 6 connected sources: Satellite Receiver, DVD,
Video, Digital Music Server, CD Changer, or uner.
Controllers:
Each zone has specific control requirements.
Zone 1 - he Lounge - he ideal control in the lounge environment is from the sofa or lounge suite.
he IRFX is a Plasma proof IR receiver, and is most suitable for IR reception from a learning
remote control.
Zone 2 - he Study - his is a listening environment where remote controls are not welcome on the
busy
desk. he best solution is a wall-mounted keypad. An Axium keypad displays amplifier power
& source selection status. he keypad learns the source equipment IR commands, and relays
these to the equipment via the AX4752.
Zone 3 - he Gym - A KRXm & the numeric KRXs keypad are used to provide additional access to the
CD
changer, and SA receiver. In addition the Keypads IR receiver is enabled so that changes can
be made using a remote while working out.
Zone 4 - he Bedroom - he KRXm keypad is situated by the bedrooms adjoining ensuite and
provides
control in that environment. he bedroom control is via the keypad’s IR receiver and a
learning remote control.
Source control IR emitters are plugged into the IR out ports.
here are two IR ports which combine both the controller inputs (IR1 + IR2) hese outputs control
sources required in all zones i.e. DVD, VCR, CD & DMS. Each controller interface has an associated IR
Out port that routes IR only to that output. In Fig1 the SA emitter is plugged into IR out port IR1,
which means the zone 1, 3 & 4 controllers may control the SA source. he uner emitter is plugged
into IR Out port IR2, so only the zone 2 controller may control the uner.
Source Components:
he AX4752 has RCA audio inputs for connecting seven stereo source components & one mono source.
he Fig 1 configuration has only six of the possible eight sources populated.
Each zone may select from any of the connected sources. Someone in the lounge may be listening and
viewing the DVD source, while another in the study may be listening to music from the Digital Music
server.
All four zones may even select the same source, in such circumstances there is a possibility that all
four zones may be trying to control that source - this is not always desirable - so a system should be
well planned and where appropriate additional source equipment installed.
Speakers:
Speakers in each zone are connected to the AX4752 by ‘Home-Run’ speaker cables.
Each zone has a maximum loading of 4 ohms.
Fig 1 depicts a powered subwoofer in the study. he subwoofer is driven by the zone 2 preamplifier,
and is set to track the zone 2 amplifier volume. he subwoofer volume or offset can be adjusted for
correct tonal balance.
Fig 1 additionally depicts a pair of speakers in the bedroom. hese are the associated bedroom
ensuite speakers and are driven by a low powered slave amplifier. he zone 4 preamplifier has been
set to ‘Independent’ mode and connects to the low powered slave amplifier.
Independent mode is where the preamplifier volume may be different from the amplifier volume
(within a range of 55dB), it also has independent Standby and Muting.
Suitable cable for Line level audio is RG59.
Video Outputs:
he composite video outputs are suitable for driving ONE composite video display device. o avoid
signal degradation, home runs of Quad screen RG6 should be less than 100meters.
8

CON ROLLER ERMINA ION
Fig 2
he recommended wiring and colour scheme is shown in Fig 2. Use home runs of Cat5E cable.
he maximum recommended cable distance from the controller to AX4752 is 200m.
When +12VDC is applied to the IRFX ‘ON’ terminal the receiver module’s ‘Ampon’ indicator
illuminates. he ON terminal should be terminated to the amplifier zone’s ‘Ampon’ output not to the
controller interface ports ‘Data’ terminal.
9
0V PG 1 2 3 4 # C D
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2IR1+IR2
IR1IR1+IR2
AMP ON
Data 12V IR 0V
CAT5E cable used to
connect controllers to
AX4752

ADVANCED IR CON ROL
Fig 3
IR routing - discussed in ‘ ypical System Configuration’ - is used to address specific centrally located
source components.
When several same brand and model source components are required in an installation, steps must be
taken to isolate the radiated IR from interfering with their discrete operation. his may be achieved
either by installing them in different cupboards or by using black IR blocking foam tape over the IR
emitters. he IR blocking foam tape is the preferred solution, since cupboard doors are often left
open.
Fig 3 shows a typical installation where several SA receivers and tuners are required.
he dashed lines enclosing the source components represent IR isolation.
he second identical sources may be plugged into unpopulated AX4752 inputs, i.e. ape, and Aux.
Axium controllers and sources may be re-labeled to identify their selection location.
Axium also offers an Emitter Expander ‘EX4’. his device simply provides connection for up to four
single or Dual IR emitters, and may be wired in parallel with the controller interface.
10
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
TA TU UT
L
R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
+12V
Tuner 2
SAT 2
Tuner 1
SAT 1
CD changer

MUL IPLE AX4752 S ACKS
Fig 4
In large installations where multiple AX4752’s are required, the expansion bus may be used to convey
inter-amplifier control, source component Audio, and IR.
Fig 4 shows inter-connected amplifiers using an expansion bus lead. he source component audio
inputs must be plugged into the first AX4752, where they are buffered and sent to the next amplifier
in the stack. he maximum recommended expansion is eight units.
If connecting serial RS232 only one connection to any amplifier is necessary.
he composite video inputs are not conveyed through the expansion bus, so an external video buffer
must be used to split the composite video sources to each AX4752.
11
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Z ealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RISK OF FIRE OR ELECT RIC
SHOCK DO NOT EXPOSE THIS UN IT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
DMS player
Tuner
CD changer
DVD Player
VCR Player
SAT receiver To IR1
To IR1+ IR2
To IR2
To IR1 + IR2
To next amplifier
in the Stack
Expansion Bus Output
Expansion Bus Input
Expansion Bus Output

ZONE LINKING
Fig 5
Zone linking is a useful feature for simplifying control in closely coupled rooms, where the rooms
require different volume levels and ON /Off status, yet the same audio source.
If for instance the Lounge and Study zones in the ‘ ypical System Configuration’ were always used
together on the same source, then zone linking could be used to simplify the control of the two
otherwise separate zones. Zone 2 is simply linked to zone 1 either via the front panel user interface
or AMC program. Once linked both zones will always select the same source whether controlled by
the lounge remote control, or study keypad.
It is possible to only link a pair of zones together, i.e. zone 1 linked to zone 2.
On the same AX4752 it would be possible to also link zone 3 to zone 4.
Options are also provided for Linking volume &/or standby via AMC.
12
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RIS K OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE T HIS UNIT
TO RAIN OR MOISTURE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
DMS player
CD changer
DVD Player
VCR Player
SAT receiver To IR1
To IR1+ IR2
To IR1 + IR2
IRFX Receiver
Controller 1
interface Keypad
Controller 1
interface
Zone 1 Zone 2
ACTIVE
SUB
CD MCD
AUXTU
DMS DVD
VOL
MUTE
Axium
+
-
STUDYLOUNGE

AU OMA ION
Fig 6
Any AX4752 parameter is controllable using the serial RS232 interface. he RS232 protocol is outlined
in the following section, and encompasses both the amplifier and connected keypads. he interface is
bi-directional, allowing the amplifier and network to be monitored.
he RS232 port connection must be made using a ‘Null Modem’ cable, where pin’s 2 & 3 are swapped
at one connector.
Fig 6 shows a typical touch panel controller providing the user interface to an AX4752. he controller
has it’s own operating system that is programmed to handle the Axium RS232 protocol. An automation
system is not restricted to touch panels, it may be an extension of a home lighting, security, building
management, or other specialized home automation system.
he ‘Page Preset’ is a special preset that is invoked whenever there is a contact closure across the
‘PG’ and 0V terminals. Each zone on the AX4752 may be set to a specific input (utility) and at
specific volumes (depends on room & application). When the contact closure is opened the AX4752
returns to its previous states. he ‘Page Preset’ is useful for telephone paging, door & gate phone
paging, or doorbell applications.
Axium also offers a six-channel relay driver – REL6 – which may be encoded for up to 16 Zones of IR
control. ypical REL6 applications are the control of curtains, screens, fan / fan speed, lights or
other simple On / Off applications that require IR remote control.
13
FUSE
0V PG 1 2 3 4 # C D
Expansion Bus OutputRS232 Serial interface
Expansion Bus Input
L R
230 - 240VAC 50 - 60Hz
500VA
Fuse = 2.5A Slow Blow
ZONE1 ZONE2
ZONE3 ZONE4
CD TA TU UT
INPUT SOURCESPRE OUTPUTS
Z1 Z2 Z3 Z4
L
R
L
R
CAUTION ATTENTION
RISK OF ELECTRIC
SHOCK DO NOT
OPEN
RISQUE DE CHOC
ELECTRIQUE NE PAS
OUVRIR
POWER
L R
AX4752i
Multi-Room amplifier
Made in New Zealand
Audio Engineering Ltd
Z 107
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS UNIT
TO RAIN OR MOIST URE
Data 12V IR1 0V
Data 12V IR2 0V
IR outputs
IR2
IR1+IR2
IR1
AMP ON
L R L R
SAT DVD VID AUX
L
R
+12V
DMS player
Tuner
CD changer
Axium
Contact closure
required when
Paging
Axium

RS232 PRO OCOL
he RS232 Asynchronous serial port provides data acquisition and control of Axium networks by a
home automation system, or PC.
he lead must be ‘Null modem’ : 9 pin female ‘D’ connectors at both ends (pin connections 2 and 3
swapped at one end) Only RX , X & 0V (pin 5) are used.
Baud Rate = 9600 , Characters are all ASCII.
Command Structure: <command><zone><data>line feed.
Command
Command Description
01 Standby
02 Mute
0 Source Selection
04 Volume
05 Bass
06 Treble
07 Balance
08 Request Axium Bus protocol version
09 Send All parameters
0A Report Error
0B Cause key press on Keypad
0C Amplifier features
0D Maximum Volume Limit
0E Preset Call
0F Link Zone
10 Unsupported IR command received
11 Volume Up
12 Volume own
1 Amp source – keypad bank assignment
14 Request evice information
15 Erase Memory
16 Request all IR function definitions
17 IR function efinition
18 Keypad Setup
19 Request Keypad setup
1A Time
1B Preset Schedule
1C Zone Name
1D Preamplifier Volume Mode
21 Request Amp Source – Keypad assignments
60 – 6F User defined IR commands, no data byte
70 – 7F User defined IR commands, one data byte
Zone Axium amplifiers and keypads are encoded with up to 32 zones
he zone byte is used for checking if the command is applicable to the device receiving the
command and if so, for optionally selecting a “sub-device”, e.g. a bank or part of a device.
he lower 5 bits of the zone byte is 00 – 1F for zones 1 to 32. he upper 3 bits represent the
sub-device. FF means all zones and can be used for turning all amplifiers ON.
he sub-device codes for the AX4752 amplifier are as follows:
000 standard amplifier
001 page preset amplifier
010 standard preamplifier
011 page preset preamplifier
For example addressing a zone 10 preamplifier = (Binary 0101010, Hex = 2A) Send ASCII ‘2A’
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Data
Command Content
Standby 00 – Standby A OFF
01 – Standby A ON
02 – Standby B OFF
0 – Standby B ON
04 – Toggle standby A
05 – Toggle standby B
06 – Standby A & B OFF
07 – Standby A & B ON
Mute 00 – Mute
01 – Un-mute
02 – Toggle Mute
Source
Selection
00 – Select C
01 – Select Tape
02 – Select Tuner
0 – Select Auxiliary
04 – Select Mono utility input
05 – Select SAT
06 – Select V
07 – Select Video
Volume 00 – A0 range
Bass F4 – 0C (-12db - +12db)
Treble F4 – 0C (-12db - +12db)
Balance EC – 14 (Left –20db – Right –20db)
Amplifier
features
00 – Loudness enabled
01 – Loudness disabled
Volume Limit 00 – A0 range
Preset 00 – Standard mode
11 – Force Preset
Track Zone 00 – 1 zone to be tracked
FF – for no zone tracking
Notes:
•Commands are used as notifications. If an amplifier is switched ON, it will notify the other
devices on the Axium Bus by sending the Standby command (01). Any amplifiers with the
same zone will take the notification as a command and also switch ON.
•When a command is sent to an amplifier it will first be transmitted on the Axium bus and
then returned to the PC (Home automation system). If an error occurs an error will be
returned instead of the original command. he PC (Home automation system) needs to
ignore its command when it is returned.
•A Standby ON command implies that the amplifier is not muted, if the amplifier was
previously OFF. A Mute command must follow the Standby command if it is muted.
•If on an AX4752 two pairs of zones are linked i.e. zones 1 & 2 and zones 3 & 4, and a
‘Link Zone’ command is sent that links zones 2 & 3, then the receiving amplifier knows the
following implications:
-Zone 3 also links to zone 2
-Since zone 3 is no longer linked to zone 4, zone 4 shall no longer be linked to zone 3
-Since zone 2 is no longer linked to zone 1, zone 1 shall no longer be linked to zone 2
15

Example strings:
010A01 : Standby A ON command for zone 10 amplifier
012A01 : Standby ON command for zone 10 preamplifier
060002 : +2db reble setting on zone 0
03IF02 : uner source selection on zone 31
0B0311 : Volume down continuous push on zone 3 keypad
Keypad key codes
An Axium Keypad may be directed to emit its learnt IR commands via RS232 control.
his is achieved by sending a ‘Cause key press on Keypad’ command, followed by the zone, and the
Keypad key code (data).
he Keypad key code is encoded with IR string repeats. (See table below)
o terminate a continuously repeating ‘Key press’, command a 00 keypad key code must be sent.
REPEATS KEY
Continuous 1 2 4 5 6 7
00 xx xx xx xx xx xx xx Stops repeating the current key
01 21 41 61 81 A1 C1 E1 Aux
02 22 42 62 82 A2 C2 E2 Tuner
03 23 43 63 83 A3 C3 E3 C Bank
04 24 44 64 84 A4 C4 E4 C
05 25 45 65 85 A5 C5 E5 Vol Up
06 26 46 66 86 A6 C6 E6 Ch Up (2)
07 27 47 67 87 A7 C7 E7 Random (1)
08 28 48 68 88 A8 C8 E8 Play
09 29 49 69 89 A9 C9 E9 Power
0A 2A 4A 6A 8A AA CA EA + Track skip (0)
0B 2B 4B 6B 8B AB CB EB - Track skip (9)
0C 2C 4C 6C 8C AC CC EC isc skip
0 2 4 6 8 A C E Mute
0E 2E 4E 6E 8E AE CE EE Fast Forward (8)
0F 2F 4F 6E 8F AF CF EF Rewind (7)
10 30 50 70 90 B0 0 F0 Pause (6)
11 31 51 71 91 B1 1 F1 Vol own
12 32 52 72 92 B2 2 F2 Ch own (5)
13 33 53 73 93 B3 3 F3 Band (4)
14 34 54 74 94 B4 4 F4 Stop (3)
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MENU NAVIGA ION
Front Panel user interface:
he controller has a 2 line by 16 character alphanumeric display with a Rotary Encoder and integral
push button (Enter key) on the knob shaft.
he AX4752 displays a hierachial menu for accessing and controlling all amplifier functions.
he user navigates through the menu using left / right rotations and Encoder Knob pushes for
selections or escapes.
•Firmware Display
F i r m w a r e V 1
he firmware version is displayed for two seconds during ‘Power-Up’
Note: he firmware may be updated to the most recent version by using the Axium ‘Up-loader 2’
program – check with your dealer for this procedure.
•System Settings
S y s t e m S e t u p :
R e s t o r e d e f a u l t s
S e t C l o c k
he system settings menu is entered by pushing and holding the enter Key for > 10 seconds.
Rotating the encoder displays the next system set-up function in the list: Restore Defaults, Set Clock
or Return icon.
•Restore Defaults : Pushing the enter key will clear the AX4752 memory deleting room names,
linked Zones, maximum volume limits, bass, treble, balance adjustments, loudness
settings, alarm clock programming, preset programming and zone assignments.
S y s t e m S e t u p :
S e t C l o c k
S y s t e m S e t u p :
( 1 3 ) : 3 5 F r i
•Set Clock: he clock is 24 Hour mode, and may be set by first adjusting the hours, then
minutes,
and finally the day - Pushing the enter Key at each setting. When the day is entered
the menu escapes back to ‘Set Clock’.
•Return: When entered returns to the ‘Primary Functions’ menu
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•Primary Functions Menu
1 6 : 4 0 L o u n g e
O f f
If the zone or room is OFF then the clock, zone or room name, power OFF and select room arrow are
displayed.
Selection bars are shown surrounding the lounges OFF power status. Rotating the knob left or right
shifts the selection bars, so that either the power status or select room arrow may be selected.
Pushing the enter Key when the power status is selected will turn the lounge amp ON and display
further functions:
1 6 : 4 0 L o u n g e
O n V o l 7 7 S A T
1 6 : 4 0 L o u n g e
O n ( V o l 7 7 ) S A T
he volume, source selection and ‘More functions’ arrow are now displayed.
o adjust the volume move the selection bars to surround the volume status and push the enter key,
the selection bars change to brackets – rotating the encoder knob now adjusts the volume. o escape
the adjustment mode simply push the enter Key.
he AX4752 always returns to the last selected zone’s volume status after 30 seconds of inactivity.
Functions:
•Power: On / Off
•Volume: 0 – 99.
•Mute: Long press (>2 seconds) when volume selected.
•Source select: CD, U, A, AUX, DVD, VID, SA , U
•Left arrow: Select Room
•Right Arrow: More Functions Menu
•Select Room
S e l e c t R o o m :
Z 4 A m p : B e d r o o m
Z 4 P r e : E n s u i t e
Z 1 A m p : L o u n g e
Z 1 P r e :
Z 2 A m p : S t u d y
Z 2 P r e :
Z 3 A m p : G y m
Z 3 P r e :
he zone number and name (if named) are displayed. Rotating the encoder Knob displays the next in
a list of eight possible room selections. Pressing the enter key selects the displayed room and then
enters its primary function menu.
18