ALLEN & HEATH AHM-16 User manual

Getting Started Guide
Before starting please check www.allen-heath.com for the latest
firmware and documentation.

AHM-16/32 Getting Started Guide
2
AP12764 Issue 1
AP12764 Issue 1
AHM-16 / AHM-32 Getting Started Guide Issue 1
Copyright © 2021 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

AHM-16/32 Getting Started Guide
3
AP12764 Issue 1
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 processor 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 setup and functions please refer to the AHM 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.

AHM-16/32 Getting Started Guide
4
AP12764 Issue 1
Packed items
Check you have received the following:
•AHM matrix processor
•This Getting Started Guide
•Safety Sheet
•IEC mains lead
•Phoenix connectors with strain relief - 1x 10-pin, 16x 3-pin (AHM-16), 24x 3-pin (AHM-32)
Contents
IMPORTANT - Read before starting ............................................................................................................3
Packed items ................................................................................................................................................4
Contents .......................................................................................................................................................4
1. Introduction......................................................................................................................................5
1.1 AHM-16 features .....................................................................................................................5
1.2 AHM-32 features .....................................................................................................................5
2. Installing AHM-16 / AHM-32.............................................................................................................6
2.1 Free standing ..........................................................................................................................6
2.2 Rack mounting........................................................................................................................6
3. Front Panel ......................................................................................................................................7
4. Rear Panel .......................................................................................................................................8
5. AHM-32 Processing Expansion Module ..........................................................................................9
6. Connections - Audio ...................................................................................................................... 10
6.1 Audio expanders with SLink card fitted................................................................................. 10
6.2 Audio expanders and Ethernet .............................................................................................11
6.3Other SLink connections.......................................................................................................11
6.4 Dante expanders with Dante card fitted ................................................................................12
7. Connections - Control....................................................................................................................13
7.1 Software and apps ................................................................................................................ 13
7.2 IP Controllers ........................................................................................................................13
7.3 Connection over WAN...........................................................................................................13
7.4 TCP Protocol......................................................................................................................... 13
8. Dimensions....................................................................................................................................14
9. Technical specs............................................................................................................................. 15
10. Processing specs ..........................................................................................................................16

AHM-16/32 Getting Started Guide
5
AP12764 Issue 1
1. Introduction
AHM-16 and AHM-32 are audio matrix processors for sound management and installation. They are
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 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.
A range of IP remote controllers is available for volume control, music source selection, preset recall and
more. AHM 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 and custom
user interfaces for multiple users and device types, with kiosk and BYOD capability.
1.1 AHM-16 features
AHM-16 features at a glance:
•16x16 processing matrix
•8x8 local analogue I/O
•I/O Port for expansion or audio networking, up to 128x128
•Dante 96kHz optional cards (AES67 and DDM ready)
•16 configurable processing outputs –up to 16 mono / 8 stereo zones
•Sound management tools
oAutomatic Mic Mixer
oANC (Ambient Noise Compensation)
oPriority ducking
o8-band PEQ, dynamics and delay on every input and zone
oSpeaker processing with x-over filter, delay, limiter and PEQ
•96kHz FPGA core with ultra-low latency
•Compatible with Allen & Heath IP1, IP6, IP8 remote controllers
•2x2 local GPIO plus networkable GPIO interface
•Front panel screen and 4x programmable SoftKeys
•4 user profiles
•Event scheduler
1.2 AHM-32 features
AHM-32 features at a glance:
•32x32 processing matrix
•12x12 local analogue I/O
•I/O Port for expansion or audio networking, up to 128x128
•Dante 96kHz optional cards (AES67 and DDM ready)
•32 configurable processing outputs –up to 32 mono / 16 stereo zones
•Sound management tools
o4x Automatic Mic Mixer
oAEC (Acoustic Echo Cancellation)*
oANC (Ambient Noise Compensation)
oPriority ducking
o8-band PEQ, dynamics and delay on every input and zone
oSpeaker 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
•Front panel screen and 8x programmable SoftKeys
•16 user profiles
•Event scheduler

AHM-16/32 Getting Started Guide
6
AP12764 Issue 1
2. Installing AHM-16 / AHM-32
2.1 Free standing
For free standing or shelf operation, apply the adhesive plastic feet to the positions indicated below.
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-16 and AHM-32 are 19-inch rack mountable and occupy 1U 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.

AHM-16/32 Getting Started Guide
7
AP12764 Issue 1
3. Front Panel
1. SoftKeys
Programmable SoftKeys for local user control. Functions are assigned by the AHM
System Manager software and include Input / Zone / Crosspoint Mute, Level, Preset
Recall, Preset Select, Paging, Zone Source Select.
2. LCD Screen and Select buttons
The LCD screen displays information about the unit or the function selected by the front
panel SoftKeys.
A splash screen is displayed at power up. Use the arrow keys to sequence through
information screens such as firmware version, network settings and diagnostics. This
can be useful to identify the unit IP address before connecting.
Level When a front panel SoftKey assigned to a Level is pressed, the screen will
display the Input / Zone name, level and meter. Use the arrow keys to control the level.
Source Select When a front panel SoftKey assigned to a Zone Source Selector is
pressed, the screen will display a list of available sources as configured in AHM System
Manager. Use the arrow keys to select the source and press Sel to confirm.
The screen will then display the active source and the Zone name, level and meter. Use
the arrow keys to control the level of the Zone. Press Sel again to select another source.
Press the SoftKey again to exit Source Select mode.
Preset Select When a front panel SoftKey assigned to Preset Select is pressed,
the screen will display a list of available Presets as configured in AHM System Manager.
Use the arrow keys to select the Preset and press Sel to recall.
The screen will then display the active Preset. Press Sel again to select another Preset.
Press the SoftKey again to exit Preset Select mode.
2
1

AHM-16/32 Getting Started Guide
8
AP12764 Issue 1
4. Rear Panel
1. Mic/Line Inputs
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 Input Channels.
Use the provided 3-pin Phoenix connectors with strain relief for optimal cable
management.
2. Line Outputs
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.
3. Mains
IEC inlet with universal power supply (100-240V AC, 50-60Hz).
4. 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-DANT32 or M-SQ-DANT64 (SQ Dante
V2) card, not the original M-SQ-DANTE card.
The I/O Port panel is also used to access DIP switch 6 for network reset of the
unit to default settings. Reset occurs with switch 6 in the On position at power
up. After 10 seconds, turn off the unit and move the switch back to the Off
position. Do not alter the position of the other DIP switches.
1
2
3
4
5
6

AHM-16/32 Getting Started Guide
9
AP12764 Issue 1
5. 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 processor 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.
6. Control Network
RJ45 Gigabit Ethernet port. Connect a laptop, wireless router or switch to use with the
AHM System Manager, IP remote controllers, Custom Control app or TCP control. All
devices on the network must have compatible IP addresses.
To reset the network settings to factory default, see DIP switch settings in the I/O
Port paragraph above.
5. AHM-32 Processing Expansion Module
A processing expansion module can be fitted in the AHM-32 for applications like AEC (Acoustic Echo
Cancelling). 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.

AHM-16/32 Getting Started Guide
10
AP12764 Issue 1
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 with SLink card fitted
When an audio expander is connected, the SLink card 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, the AHM processor 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. AHM
processors do not support redundant connection to DX expanders.
DX164-W
Cascade Mode: ON
DX164-W
DX
SLink
A DX Hub can be connected to the SLink card for further expansion with up to 8 DX expanders. It also
enables a single cable link to the AHM processor in cases where multiple expanders are located on a
different floor, area or building.

AHM-16/32 Getting Started Guide
11
AP12764 Issue 1
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.
6.3 Other SLink connections
The SLink card can be connected directly to another AHM processor, 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.

AHM-16/32 Getting Started Guide
12
AP12764 Issue 1
Set the Audio Sync options so that one device is the clock leader (set to ‘Internal’)
and the other device is a clock follower (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 processors or other Allen & Heath mixers for control
purposes, for example for Embedded Scene Recalls or System Manager operation.
Avantis
dLive (gigaACE card)
SQ
AHM-64
SLink gigaACE
SLink
SLink
6.4 Dante expanders with Dante card fitted
Control of the DT168 or DT164-W expanders requires an M-SQ-DANT32 or 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 the AHM processor, 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.
Network Switch
Dante Controller
DT164-W
Dante Clocking: Slave
DT164-W
Dante Clocking: Slave
DT164-W
Dante Clocking: Slave
DT164-W
Dante Clocking: Slave

AHM-16/32 Getting Started Guide
13
AP12764 Issue 1
7. Connections - Control
A computer, wireless router or switch can be connected to the Network port to use with the AHM 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 processors communicate over TCP/IP. All devices on the network must have compatible
IP addresses. Factory defaults for AHM-16 and AHM-32 are:
IP Address 192.168.1.91 Subnet Mask 255.255.255.0 Gateway 192.168.1.254
AHM processors support 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 processors are 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, the AHM processor will check the firmware version of the IP controllers and
GPIO and upgrade or downgrade the device to match the main unit firmware.
7.3 Connection over WAN
For connection of System Manager or Custom Control over a WAN, TCP port 51321 should be forwarded
by the NAT to the IP address of the AHM 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 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
depending on the External Control security options set with AHM System Manager.
Check www.allen-heath.com for drivers or project templates for leading control
systems such as Crestron or AMX.

AHM-16/32 Getting Started Guide
14
AP12764 Issue 1
8. Dimensions
270.00
482.60
437.00
433.00
156.27
3.01
44.00
220.81
2.23
365.00
220.00

AHM-16/32 Getting Started Guide
15
AP12764 Issue 1
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 - 20kHz +0/-0.5dB
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 150Ωsource
Outputs
Analogue Outputs
Balanced, Relay protected
Output Impedance
<75Ω
Nominal Output
+4dBu = 0dB meter reading
Playback
Maximum Output Level
+21dBu
Internal Storage
~2.6GB
Residual Output Noise
-92dBu (muted, 22-22kHz)
File types
Mono/stereo .WAV (16/24bit,
44.1/48/96kHz), MP3
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-32
482.6mm x 270mm x 44mm x 4kg
(19” x 10.6” x 1.7”x 8.8lbs)
Mains Power (AHM-32)
100-240V AC, 50-60Hz, 70W max
AHM-16
482.6mm x 270mm x 44mm x 3.8kg
(19” x 10.6” x 1.7”x 8.4lbs)
Mains Power (AHM-16)
100-240V AC, 50-60Hz, 65W max
Boxed
AHM-32
555 x 385 x 150 mm x 5.3kg
(21.8” x 15.2” x 5.9” x 11.7lbs)
AHM-16
555 x 385 x 150 mm x 5.1kg
(21.8” x 15.2” x 5.9” x 11.2lbs)

AHM-16/32 Getting Started Guide
16
AP12764 Issue 1
10.Processing specs
Input Processing
Zone Processing
16/32 Input Channels
Configurable mono or stereo
Up to 16/32 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 0-
5000ms
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 / Lo-
Pass
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 (AHM-16)
1x16
Channels (AHM-32)
1x32, 2x 16 or 4x 8
Delay
Up to 683ms
Modes
D-Classic gain sharing or NOM