Getting Started Guide
Before starting please check www.allen-heath.com for the latest
firmware and documentation.
AP11781 Issue 6
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AHM-64 Getting Started Guide Issue 6
Copyright © 2022 Allen & Heath. All rights reserved.
Allen & Heath Limited, Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK
http://www.allen-heath.com
Limited Three Years Manufacturer’s Warranty
Allen & Heath warrants this Allen &Heath -branded hardware product and accessories contained in the
original packaging ("Allen & Heath Product”) against defects in materials and workmanship when used
in accordance with Allen & Heath's user manuals, technical specifications and other Allen & Heath
product published guidelines for a period of THREE (3) YEARS from the date of original purchase by the
end-user purchaser ("Warranty Period").
This warranty does not apply to any non-Allen & Heath branded hardware products or any software,
even if packaged or sold with Allen & Heath hardware.
Please refer to the licensing agreement accompanying the software for details of your rights with respect
to the use of software/firmware (“EULA”).
Details of the EULA, warranty policy and other useful information can be found on the Allen & Heath
website: www.allen-heath.com/legal.
Repair or replacement under the terms of the warranty does not provide right to extension or renewal of
the warranty period. Repair or direct replacement of the product under the terms of this warranty may be
fulfilled with functionally equivalent service exchange units.
This warranty is not transferable. This warranty will be the purchaser’s sole and exclusive remedy and
neither Allen & Heath nor its approved service centres shall be liable for any incidental or consequential
damages or breach of any express or implied warranty of this product.
Conditions Of Warranty
The equipment has not been subject to misuse either intended or accidental, neglect, or alteration other
than as described in the User Guide or Service Manual, or approved by Allen & Heath.
Any necessary adjustment, alteration or repair has been carried out by an authorised Allen & Heath
distributor or agent.
The defective unit is to be returned carriage prepaid to the place of purchase, an authorised Allen &
Heath distributor or agent with proof of purchase. Please discuss this with the distributor or the agent
before shipping. Units returned should be packed in the original carton to avoid transit damage.
DISCLAIMER: Allen & Heath shall not be liable for the loss of any saved/stored data in products that are
either repaired or replaced.
Check with your Allen & Heath distributor or agent for any additional warranty information which may
apply. If further assistance is required please contact Allen & Heath Ltd.
ALLEN&HEATH
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IMPORTANT - Read before starting
Safety instructions
Before starting, read the Important Safety Instructions printed on the sheet supplied with the equipment.
For your own safety and that of the operator, technical crew and performers, follow all instructions and heed
all warnings printed on the sheet and on the equipment panels.
System operating firmware
The function of AHM-64 is determined by the firmware (operating software) that runs it. Firmware is updated
regularly as new features are added and improvements made.
Check www.allen-heath.com for the latest version of firmware.
Software licence agreement
By using this Allen & Heath product and the software within it you agree to be bound by the terms of the
relevant End User Licence Agreement (EULA), a copy of which can be found at www.allen-
heath.com/legal. You agree to be bound by the terms of the EULA by installing, copying, or using the
software.
Further information
Please refer to the Allen & Heath website for further information, knowledgebase and technical support.
For more information on AHM-64 setup and functions please refer to the AHM-64 System Manager Help.
Check for the latest version of this Getting Started Guide.
General precautions
• Protect the equipment from damage through liquid or dust contamination.
• If the equipment has been stored in sub-zero temperatures allow time for it to reach normal
operating temperature before use at the venue.
• Avoid using the equipment in extreme heat and direct sunlight. Make sure the ventilation slots are
not obstructed and that there is adequate air movement around the equipment.
• Clean the equipment with a soft brush and dry lint-free cloth. Do not use chemicals, abrasives or
solvents.
• It is recommended that servicing is carried out only by an authorised Allen & Heath agent. Contact
details for your local distributor can be found on the Allen & Heath website. Allen & Heath do not
accept liability for damage caused by maintenance, repair or modification by unauthorised
personnel.
Register your product
Register your product online at www.allen-heath.com/register.
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Packed items
Check you have received the following:
• AHM-64 matrix processor
• This Getting Started Guide
• Safety Sheet
• IEC mains lead
• Phoenix connectors with strain relief (1x 10-pin, 24x 3-pin, 1x 2-pin)
Contents
IMPORTANT - Read before starting ............................................................................................................ 3
Packed items ................................................................................................................................................ 4
Contents ....................................................................................................................................................... 4
1. Introduction...................................................................................................................................... 5
1.1 AHM-64 features ..................................................................................................................... 5
2. Installing AHM-64 ............................................................................................................................. 6
2.1 Free standing .......................................................................................................................... 6
2.2 Rack mounting ........................................................................................................................ 6
2.3 Rear rack kit ............................................................................................................................ 6
3. Front Panel ...................................................................................................................................... 7
4. Rear Panel ....................................................................................................................................... 8
5. Top Panel ...................................................................................................................................... 10
6. Connections - audio ...................................................................................................................... 11
6.1 Audio expanders over SLink ................................................................................................. 11
6.2 SLink connection to SQ, dLive, Avantis or other AHM-64 ..................................................... 13
6.3 Dante expanders ................................................................................................................... 13
7. Connections - control .................................................................................................................... 14
7.1 Software and apps ................................................................................................................ 15
7.2 IP Controllers ........................................................................................................................ 15
7.3 Connection over WAN ........................................................................................................... 15
7.4 TCP Protocol ......................................................................................................................... 15
8. Dimensions .................................................................................................................................... 17
9. Technical specs ............................................................................................................................. 18
10. Processing specs .......................................................................................................................... 19
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1. Introduction
AHM-64 is an audio matrix processor for sound management and installation. It is designed for audio
distribution, paging, conferencing, speaker processing in a multitude of environments including corporate,
hospitality, education, event and multi-purpose venues, retail, theatres, cruise ships, sports venues.
The AHM-64 processor is complemented by an extended ecosystem of remote audio expanders, remote
controllers, interfaces, apps and software. A family of portable, rack-mountable or wall-mount audio
expanders is available with a choice of proprietary point-to-point Layer-2 or Dante transport protocols.
AHM-64’s scalability supports up to 268 system inputs and system outputs, and up to 96 IP remote
controllers for volume control, music source selection, preset recall and more. It can also integrate with
third party devices over GPIO, TCP/IP, or industry standard control systems. The Custom Control editor
and app from Allen & Heath offer more control options with tailored user interfaces for multiple users and
device types, with kiosk and BYOD capability.
1.1 AHM-64 features
AHM-64 features at a glance:
• 64x64 processing matrix
• 12x12 local analogue I/O
• I/O Port for audio networking, up to 128x128
• Dante 96kHz 64x64 optional card (AES67 and DDM ready)
• 128x128 built-in SLink port for audio expansion
• 64 configurable processing outputs – up to 64 mono / stereo zones
• Sound management tools
o 8x Automatic Mic Mixers
o AEC (Acoustic Echo Cancellation)*
o ANC (Ambient Noise Compensation)
o Priority ducking
o 8-band PEQ, dynamics and delay on every input and zone
o Speaker processing with x-over filter, delay, limiter and PEQ
*with optional module
• 96kHz FPGA core with ultra-low latency
• Compatible with Allen & Heath IP1, IP6, IP8 remote controllers
• 2x2 local GPIO plus networkable GPIO interface
• DC backup power supply
• System Manager software
• Custom Control app and editor
• 32 user profiles
• Integrated stereo / dual mono playback
• Event scheduler
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2. Installing AHM-64
2.1 Free standing
For free standing or shelf operation, check that the plastic feet are fitted. Ensure adequate air flow around
the unit. It must not be covered in any way. Always stand the unit on a firm flat surface away from any soft
furnishings or carpet.
2.2 Rack mounting
AHM-64 is 19-inch rack mountable and occupies 2U of rack space. The plastic feet may need to be removed
before rack mounting; retain them for future use.
Ensure natural convection of airflow around the unit by allowing good ventilation in
front of and behind the unit. Rack equipment known to produce a significant amount
of heat should not be mounted directly above or below the unit. Forced convection
by means of a rack mounted fan-tray may be desirable in situations where space is
restricted, and the ambient air temperature is high.
2.3 Rear rack kit
A kit is available for extra rack support of AHM-64, securing the unit to the rear of a rack cabinet in
environments where vibration or mechanical stress are of concern. The rear rack kit is extendable and can
fit racks between 485mm and 600mm deep.
600.00mm/23.622"
485.00mm/19.1"
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3. Front Panel
1. Status LEDs
PSU Correct functioning of the internal, universal power supply.
DC In Valid 12V supply connected to the DC Input.
Ready Unit is correctly powered up and ready to pass audio.
Sync Audio is sync locked to a valid clock source.
Sig Assignable Chromatic meter with variable colour and brightness. Factory
default measures the highest level across all input and output channels, with
peaks flashing red.
2. Fans
Variable speed with temperature sensing. Make sure the ventilation opening is not
obstructed.
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4. Rear Panel
1. Line Outputs
12x assignable line level, balanced outputs on Phoenix connectors. Nominal level
+4dBu. The outputs are relay protected to prevent power on or off thumps.
Use the provided 3-pin Phoenix connectors with strain relief for optimal cable
management.
2. Mic/Line Inputs
12x recallable preamps on Phoenix connectors, for balanced or unbalanced
microphone and line level signals. Gain, Pad and 48V are digitally controlled within the
preamp.
Any socket can be patched to any of the 64 Input Channels or Insert Returns.
Use the provided 3-pin Phoenix connectors with strain relief for optimal cable
management.
3. DC Input
12V input for backup power supply. The IEC and DC connectors can be connected at
the same time for power supply redundancy in case of a mains power loss.
Use the provided 2-pin Phoenix connector with strain relief for optimal cable
management.
4. Mains
IEC inlet with universal power supply (100-240V AC, 50-60Hz). The internal PSU is the
primary supply and overrides the DC Input unless a fault occurs.
A plastic P-clip cable clamp is provided to secure the mains cable. Slot the cable in or
lock it in place using a star Torx© T20 screwdriver to refit the clamp around the cable.
5. I/O Port
Audio interface port providing up to 128x128 I/O. Fit one of the option cards available
for system expansion, distributed audio networking or system integration. Refer to
www.allen-heath.com for a list of available option cards.
For Dante audio networking, use the M-SQ-DANT64 (SQ Dante V2) card, not the
original M-SQ-DANTE card.
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6. Control Network
RJ45 Gigabit Ethernet port. Connect a laptop, wireless router or switch to use with the
AHM-64 System Manager, IP remote controllers, Custom Control app or TCP control.
All devices on the network must have compatible IP addresses.
A recessed switch lets you reset the network settings to factory default. To reset,
turn the unit off, insert a pointed object to press and hold the switch whilst
turning the unit back on. Hold the switch in for at least 20 seconds.
7. SLink
For connection to remote I/O expanders with plug ‘n play operation. Supports the GX,
DX, AB and AR ranges of expanders plus the DX Hub. It can also be used for
connection to an Allen & Heath SQ, Avantis or dLive live mixing console, or linking to
another AHM-64 unit.
The Lnk/Err LED flashes yellow at a steady rate when the link is established, and lights
red if a communication error is detected.
8. GPIO
General purpose interface for control integration with third party hardware. Offers 2x
inputs switching to ground, and 2x relay outputs on Phoenix connectors, in addition to
a +10V DC output.
Maximum current drawn from the +10V supply for all outputs combined must not
exceed 200mA
Output 1 can be wired as normally closed or normally open. Output 2 is normally
open.
For higher current or voltage applications, an external DC power supply may be used.
This also provides total isolation between the AHM-64 and external equipment.
Maximum external supply voltage must not exceed +24V DC. Maximum current
sink through any open collector output must not exceed 400mA.
Use the provided 10-pin Phoenix connector with strain relief for optimal cable
management.
9. Kensington lock
Slot for securing the unit or peripheral devices using industry standard Kensington
locks and cables.
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5. Top Panel
1. Optional module
Slot for optional processing module. Refer to www.allen-heath.com for a list of available
modules. Follow the fitting instructions of the optional module for installation.
⚠ Installation of any optional module must only be carried out by technically
skilled personnel.
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6. Connections - Audio
For all audio connections, use CAT5e (or higher specification) STP cables up to 100m long.
Refer to www.allen-heath.com for cable requirements, recommendations, and a list
of CAT cables available to order.
6.1 Audio expanders over SLink
When an audio expander is connected, the SLink port detects the type of device and automatically
switches to the relevant Allen & Heath protocol, sample rate and Ethernet speed. The table below lists
compatible audio expanders. Visit allen-heath.com/everything-io/ for more information on our range of
expansion options.
Sample
Rate
Inputs
Outputs
Connection
Protocol
Ethernet
speed
GX4816
96kHz
48
16
SLink port
gigaACE
Gigabit
DX32
96kHz
<32
SLink port or DX Hub
DX
Fast Ethernet
DX168
96kHz
16 8 SLink port or DX Hub
DX
Fast Ethernet
DX164-W
96kHz
16 4 SLink port or DX Hub
DX
Fast Ethernet
DX012
96kHz 0 12
SLink port or DX Hub
DX
Fast Ethernet
DX Hub
96kHz
128
128
SLink port
gigaACE
Gigabit
AR2412
48kHz
24
12
SLink port
dSnake
Fast Ethernet
AR84
48kHz 8 4
Slink port
dSnake
Fast Ethernet
AB168
48kHz
16 8 Slink port
dSnake
Fast Ethernet
At connection or power up, AHM-64 will check the firmware version of the expander device and upgrade
or downgrade the device to match the main unit firmware.
Up to 2x dSnake 48kHz expanders can be daisy-chained over SLink, provided the first expander is an
AR2412 or AB168, and the second expander is an AB168 or AR84. Connection of 2x AR2412 is not
supported.
Up to 2x DX168, DX164-W, DX012 expanders in any combination can be daisy-chained over SLink. AHM64 does not support redundant connection to DX expanders.
SLink
DX164-W
Cascade Mode: ON
DX164-W
DX
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A DX Hub can be connected to the SLink port for further expansion with up to 8 DX expanders. It also
enables a single cable link to the AHM-64 processor in cases where multiple expanders are located on a
different floor, area or building.
DX168
DX164-W
Cascade Mode: ON
DX168
DX164-W
Cascade Mode: ON
DX164-W
Cascade Mode: ON
DX164-W
Cascade Mode: ON
DX164-W DX164-W
6.2 Audio expanders and Ethernet
All protocols listed above are point-to-point connections, Ethernet Layer 2 compliant. gigaACE operates at
Gigabit Ethernet speed (1000BASE-T, IEEE 802.3ab). DX and dSnake operate at Fast Ethernet speed
(100BASE-TX, IEEE 802.3u).
Layer 2 network devices and media converters can be used, provided they support the correct link speed.
Typical applications include conversion to fibre optic for longer cable runs, or integration within an
existing Ethernet infrastructure. Refer to the following guidelines and always test the network for
functionality and reliability before putting into service. Further advice and notes on VLANs, TCP ports and
bandwidth are available on the online Allen & Heath Knowledgebase and website.
Layer 2.5 and higher protocols including Spanning Tree, Tagged Egress Packets,
and Broadcast Storm Protection can cause interruption to audio data or audible
clicks. Smart / managed switches may allow turning off Layer 3 or 4 functions, but as
a general rule we recommend using Layer 2 devices only.
Note that no other device should be plugged into a switch carrying gigaACE,
dSnake or DX audio. Parallel connection of multiple expanders on the same switch
is not possible.
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6.3 Other SLink connections
The SLink port can be connected directly to another AHM-64 unit, an SLink enabled Allen & Heath mixer
such as SQ or Avantis, or a dLive system fitted with a gigaACE card. This connection enables 128x128
channels of audio.
Set the Audio Sync options so that one device is the clock leader (set to ‘Internal’)
and the other device is a clock follower (set to sync from SLink or I/O Port as
appropriate).
The SLink port does not tunnel control network data. Use the Network port to
connect multiple AHM-64 units or other Allen & Heath mixers for control purposes,
for example for Embedded Scene Recalls or System Manager operation.
Avantis
SLink gigaACE
SLink
dLive (gigaACE card)
SQ
SLink
AHM-64 AHM-64
AHM-64 AHM-64
AHM-64
6.4 Dante expanders
Control of the DT168 or DT164-W expanders requires an M-SQ-DANT64 (SQ Dante V2) card fitted in the
I/O Port.
Use Dante Controller to patch signals between Dante devices. When a valid DT168 or DT164-W socket is
routed to AHM-64, and patched to an Input channel, System Manager will present preamp gain, +48V and
Pad controls for the socket.
DT expanders should always be clock followers on the Dante network, with the AHM-64 processor typically
set to ‘Preferred Leader’ and ‘Enable Sync to External’.
Refer to the DT expander Getting Started Guide at www.allen-heath.com for further
information.
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Network Switch
Dante Controller
DT164-W
DT164-W
DT164-W DT164-W
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7. Connections - Control
A computer, wireless router or switch can be connected to the Network port to use with the AHM-64 System
Manager, IP remote controllers, Custom Control app or TCP control.
For all connections, use CAT5e (or higher specification) cables up to 100m long.
Refer to www.allen-heath.com for cable requirements, recommendations, and a list
of CAT cables available to order.
AHM-64 communicates over TCP/IP. All devices on the network must have compatible IP
addresses. Factory defaults for AHM-64 are:
IP Address 192.168.1.90
Subnet Mask 255.255.255.0
Gateway 192.168.1.254
AHM-64 supports up to 100 TCP connections. These include any IP controller, GPIO
interface, System Manager or Custom Control instance. More information is
available on the online Allen & Heath Knowledgebase.
7.1 Software and apps
For direct, wired laptop connection using System Manager or the Custom Control editor, set the
laptop to a static, compatible IP address, for example 192.168.1.10.
For LAN or wireless connections, including Custom Control apps, set the router / access point
to a compatible IP address, for example 192.168.1.254, and its DHCP range to a compatible
range of addresses, for example 192.168.1.100 to 192.168.1.200. Set any laptop, tablet or
mobile device to DHCP / ‘obtain an IP address automatically’.
7.2 IP Controllers
AHM-64 is compatible with the remote controllers and GPIO interfaces listed below. All devices listed here
can be set to DHCP if required.
Description
Default IP
PoE
IP1
Wallmount remote controller with dual-function rotary encoder.
192.168.1.74
802.3af
IP6
Remote controller with 6 push-and-turn rotary encoders.
192.168.1.72
802.3af
IP8
Remote controller with 8 motorised faders.
192.168.1.73
802.3at
GPIO
8x8 general purpose interface for control integration.
192.168.1.75
802.3af
The function of the IP controllers and GPIO is configured via the AHM System Manager.
At connection or power up, AHM-64 will check the firmware version of the IP controllers and GPIO and
upgrade or downgrade the device to match the main unit firmware.
Visit www.allen-heath.com for more information on our range of remote controllers.
7.3 Connection over WAN
For connection of System Manager or Custom Control over a WAN, TCP port 51321 and UDP port 51324
should be forwarded by the NAT to the IP address of the AHM-64 processor.
We strongly recommend using a secure VPN to access the local network. When
connecting directly over the Internet, use a good quality firewall and NAT to block
ports when not in use.
7.4 TCP Protocol
A TCP Protocol for control and interrogation of AHM-64 parameters is available and documented at
www.allen-heath.com. Clients should be configured to use TCP port 51325 (unsecured) or the TLS/TCP
port 51327.
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Check www.allen-heath.com for drivers or project templates for leading control
systems such as Crestron or AMX.
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8. Dimensions
87.00/3.5"
91.20/3.6"
371.0/14.6"
18.00/0.4"
275.96/10.9"
439.0017.28"
482.60/19"
21.80/0.86"
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9. Technical specs
Inputs
System
Mic/Line Inputs
Balanced, +48V phantom power
Measured balanced XLR in to XLR out, 20-20kHz, +5dB Gain,
Pad out, signal @ 0dB (meter)
Mic/Line Preamp
Fully recallable
Dynamic Range
108dB
Input Sensitivity
-60 to +15dBu
System Signal to Noise
-92dB
Analogue Gain
+5 to +60dB, 1dB steps
Frequency Response
20Hz - 25kHz +0/-0.8dB
Pad
-20dB Active PAD
THD+N (analogue in to
out)
0.005% @ +16dBu output, 1kHz
+5dB gain
Maximum Input Level
+30dBu (PAD in)
Headroom
+18dB
Input Impedance
>3kΩ (Pad out), >8kΩ (Pad in)
Sampling Rate
96kHz +/- 20 PPM
Mic EIN
-127dB with 150Ω source
Outputs
Analogue Outputs
Balanced, Relay protected
Playback
Output Impedance
<75Ω
Internal Storage
~3GB
Nominal Output
+4dBu = 0dB meter reading
File types
Mono/stereo .WAV (16/24bit,
44.1/48/96kHz), MP3, FLAC
Maximum Output Level
+22dBu
Residual Output Noise
-92dBu (muted, 20-20kHz)
-90dBu (muted, 20-40kHz)
Dimensions and
Weights
Unboxed
Width x Depth x Height x Weight
Operating Temperature
Range
0 deg C to 40 deg C
(32 deg F to 104 deg F)
AHM-64
482.6mm x 364mm x 91.2mm x 7kg
(19” x 14.3” x 3.6” x 15.5lbs)
Mains Power
100-240V AC, 50-60Hz, 70W max
DC Power
12VDC - 5A minimum
8A maximum
Boxed
AHM-64
600 x 500 x 180 mm x 9.5kg
(23.6” x 19.7” x 7.1” x 21lbs)
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10.Processing specs
Input Processing
Zone Processing
64 Input Channels
Configurable mono or stereo
Up to 64 Zones
Configurable mono or stereo
Trim
+/-24dB digital trim
Source Selector
Up to 20 sources, variable
level, Fade In and Fade Out
time <20s
Polarity
Normal/Reverse
Insert
In/Out, +4dBu/-10dBV level
Stereo Width Control
L/R, R/L, L -Pol/R, R -Pol/L, Mono,
L/L, R,R, M/S
GEQ
28 bands 31Hz -16kHz, +/-12dB,
constant-Q
Gate PEQ
See Input Processing
Sidechain
Self-key or source selectable, with
12dB/octave Lo-Pass and Hi-Pass
Compressor
See Input Processing
Threshold
-72dBu to +12dBu
Delay
Up to 683ms
Depth
0 to 60 dB
ANC
Attack
50us to 300ms
Ambient Level
Selectable source and metering point,
Gain Differential -18dB to 40dB
Hold
10ms to 5s
Gap
Selectable source and metering point,
Threshold -62dB to -20dB, Time 05000ms
Release
10ms to 1s
Gain Element
Min / Max Gain, Rate 0-30dB/s
Insert
In/Out, +4dBu/-10dBV level
Limiter
Variable Threshold, Attack and
Release
PEQ
Type
8-Band fully parametric, +/-15dB
Speaker
Processing
Band 1 - 8
Selectable LF/HF Shelving, Bell
(variable or constant Q), Hi-Pass / LoPass
Crossovers
Configurable 2, 3, 4 way
Bell Width
0.50 – 6.00 Q
Filters
Asymmetrical, selectable 1st order,
Butterworth 12/18/24 db/octave, LR
12/24 dB/octave
Shelving Type
Classic Baxandall
EQ
4-Band fully parametric, or 28 band
GEQ
Hi-Pass, Lo-Pass Filter
12dB/octave
Delay
Up to 683ms
Compressor
Peak or RMS sensing
Limiter
See Zone Processing
Sidechain
Self-key or source selectable, with
12dB/octave Lo-Pass and Hi-Pass
Threshold
-46dBu to 18dBu
AMM
Compressor parameters
Threshold, Ratio, Attack, Release
Channels
1x64, 2x32, 4x16 or 8x8
Modes
D-Classic gain sharing or NOM
Delay
Up to 683ms
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