Fohhn DI-4.1000 User manual

AMP CONTROLLER-SERIES
DI-SERIES
USER MANUAL
EN
Please read this user manual through carefully before putting the system into operation and keep it for future reference.

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Contents
1. Introduction and General Instructions................................................................................................ 4
1.1 Important Safety Instructions ....................................................................................................... 4
1.1.1 Definition of Terms................................................................................................................. 4
1.1.2 General Safety Instructions .................................................................................................... 5
1.1.3 Electrical Safety Information .................................................................................................. 5
1.1.4 Acoustic Safety Information ................................................................................................... 6
1.1.5 Connections and Cabling ........................................................................................................ 7
1.2 Operating Conditions .................................................................................................................... 7
1.2.1 Information on Abnormal Operation ..................................................................................... 8
1.3 Storage and Transportation .......................................................................................................... 8
2. The Product ......................................................................................................................................... 9
2.1 Product Description....................................................................................................................... 9
2.2. Contents ..................................................................................................................................... 10
2.3 Unpacking.................................................................................................................................... 10
3. Setting Up.......................................................................................................................................... 11
3.1 Professional Rack Mounting........................................................................................................ 11
3.2 Connection Instructions and Controls......................................................................................... 11
3.2.1 Standard Connections .......................................................................................................... 12
3.2.2 Optional Connection Interfaces ........................................................................................... 15
3.2.3 Status Displays...................................................................................................................... 19
3.3 Configuration............................................................................................................................... 20
3.3.1 System Requirements........................................................................................................... 20
3.3.2 Downloading and Installing FOHHN AUDIO SOFT ................................................................ 20
3.3.3 FOHHN-NET Cabling and ID Allocation................................................................................. 21
3.3.4 Loading Loudspeaker Presets............................................................................................... 23
3.3.5 Updating the Firmware ........................................................................................................ 23
3.3.6 Connecting All Devices ......................................................................................................... 23
3.3.7 Gain Structure and Signal Chain ........................................................................................... 24
3.3.8 Matrix Functions and DSP Routing....................................................................................... 26
3.3.9 Integration into a Dante™ Network ..................................................................................... 28
3.3.10 Integration into an Optocore Network .............................................................................. 32
3.3.11 Integration into the AIREA-NET.......................................................................................... 33
3.3.12 Renaming Devices and Output Channels ........................................................................... 33

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3.4 Further Functions ........................................................................................................................ 33
3.4.1 Auto Power Save .................................................................................................................. 33
3.4.2 Switching Contact................................................................................................................. 35
3.4.3 Password Lock ...................................................................................................................... 36
4. Remote Switch-On and Sequential Switch-On.................................................................................. 37
4.1 Sequential Switch-On / -Off......................................................................................................... 37
4.2 Sequential Remote Switch-On / Switch-Off ................................................................................ 38
4.3 Examples...................................................................................................................................... 39
5. Technical Specifications..................................................................................................................... 42
5.1 DI-2.2000 ..................................................................................................................................... 42
5.2 DI-4.1000 ..................................................................................................................................... 47
6. Troubleshooting ................................................................................................................................ 52
7. Service and Repair............................................................................................................................. 53
7.1 Maintenance Measures............................................................................................................... 53
7.2 Cleaning Fan Filter Foam Without Tools ..................................................................................... 53
8. Appendix............................................................................................................................................ 55
8.1 Environmental Information......................................................................................................... 55
8.2 CE Marking and Declaration of Conformity................................................................................. 55
8.3 Trademarks.................................................................................................................................. 55
8.4 Protection Classes and Protection Types .................................................................................... 55
8.5 Disclaimer and Copyright ............................................................................................................ 56
8.6 Contact Address .......................................................................................................................... 56

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1. Introduction and General Instructions
Congratulations on the purchase of your FOHHN® DSP amplifier. Like all products in our AMP
CONTROLLER-SERIES, DI-SERIES amplifiers are equipped with the latest CLASS D technology. These
amplifiers have been developed to meet the highest demands for sound quality and reliability.
All DSP functions on a DI-SERIES amplifier can be controlled using a single piece of software, FOHHN
AUDIO SOFT.
In order to benefit from all the advantages of your DSP amplifier and to guarantee trouble-free
operation, please read the following instructions carefully before starting up the system and keep
this manual for future reference!
1.1 Important Safety Instructions
Please read the following safety instructions in their entirety before starting up this device. Keep
these instructions near the device at all times. Reading the instructions does not replace the need for
awareness of and compliance with currently applicable national safety regulations and standards, or
the observance of safe on-site working methods.
All information and technical specifications published here are based on data that was available at
the time of publication. We expressly reserve the right to make any changes.
1.1.1 Definition of Terms
Danger
This signal word indicates a hazard with a high-risk level, which, if not avoided, could result in death
or serious injury.
Warning
This signal word indicates a hazard with a medium risk level, which, if not avoided, could result in
death or serious injury.
Caution
This signal word indicates a hazard with a lower risk level, which, if not avoided, could result in minor
or moderate injury.

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1.1.2 General Safety Instructions
Danger:
To avoid danger to life or limb, please ensure that all personnel involved in installing or dismantling
this type of system have read and understood the contents of this manual.
That said, the information presented here should be regarded as accompanying advice and it does
not affect the ultimate responsibility of the user to ensure safe on-site operation of a FOHHN system.
Warning:
To avoid injury,
the device must be stored, installed and operated well away from children.
To avoid injuries, this device must be taken out of operation, marked appropriately and protected
against accidental use if it
shows visible signs of damage
appears to contain loose parts,
is not working correctly,
has been subjected to unfavourable conditions (e.g. moisture) for a prolonged period
has been subjected to poor transportation conditions (e.g. with unsuitable packaging or
humidity).
If necessary, please contact your FOHHN dealer or the transport company immediately. Our
contact details can be found in the appendix to this user manual.
1.1.3 Electrical Safety Information
FOHHN DSP amplifiers are Protection Class 1 appliances. They are built and certified in accordance
with the VDE safety measures for electronic devices and, safety-wise, leave our factory in perfect
condition. The devices comply with all currently applicable EMC directives, as confirmed by the
attached CE marking.
The relevant standards can be found in the appendix to this user manual.
Warning:
To minimize the risk of electric shock,
the mains contact grounding pin must never be separated and under no circumstances
should the plug be taped up.
the device must only be connected to a professionally tested shockproof socket.
the device enclosure must never be opened. The device does not contain any components
that can be repaired by the user. In the unlikely case of a defect, please consult qualified
service personnel and/or the dealer from whom you purchased your system!
Please also ensure that the local mains supply voltage matches the power supply voltage specified on
the device.

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To minimize the risk of an electric shock or fire,
the device must not be subjected to moisture.
containers filled with liquid (e.g. beverage containers) must not be placed on the device.
ventilation slots must not be covered with objects (e.g. protective rain covers).
the device must not be subjected to excessive heat, sunshine, fire or similar.
no open sources of flame (e.g. pyrotechnics) must be placed on the device.
Caution:
To avoid damaging the device,
do not leave the power cable plugged in if the device will not be used for a prolonged period.
(Remove the plug from the mains socket in order to completely disconnect the device!)
1.1.4 Acoustic Safety Information
FOHHN loudspeaker systems are capable of generating very high sound pressure levels, which can
cause irreparable damage to hearing.
Warning:
To avoid potential hearing impairment,
never stand in close proximity (1 metre or less) to a device while it is in operation.
To prevent both hearing impairment and damage to the device, avoid the following while the device
is in operation:
acoustic feedback
high powered, permanently distorted signals
impulse noises, which can occur when a device is switched on or off, connected or
disconnected from the system

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1.1.5 Connections and Cabling
Please note the following when wiring up your system:
Check that your cable is working faultlessly and only use cables with a sufficient cross
section.
Only use cabling and connector materials that meet professional standards.
Only use properly shielded cables and plugs for the audio and data connections.
Only use power cables with a fully intact grounding pin and make sure that the device’s
mains plug is accessible at all times so that it can be quickly removed from the mains supply
in the event of a malfunction.
Lay and secure the cabling so that it cannot be damaged by tools, or through being trapped
by the device or by a fixing bracket.
Protect any laid cables from mechanical damage, or unnecessary traction.
Avoid excessive tightening of the screws on connection terminals!
The wiring up of loudspeakers should only be done by suitably qualified personnel!
Important: To enable communication between a Windows PC with FOHHN AUDIO SOFT installed
and DI-Series amplifiers, a FOHHN network adapter (e.g. NA-11 FOHHN-NET USB ADAPTER or NA-3
FOHHN-NET ETHERNET ADAPTER) is required.
More information can be found in Chapter 3 of this user manual!
1.2 Operating Conditions
Please note the following when operating your system:
The permitted ambient temperature of the device during operation ranges from 0 °C to +40
°C.
The device is intended for use in a dry environment with normal levels of dust and humidity
in the air.
If moisture has built up on the device’s rear panel, either during transportation or storage, let
the device acclimatise for ca. 2 hours before use.
Never expose the device to aggressive chemical fluids or vapours.
Always make sure that heat can be dissipated via the outer surfaces of the device enclosure.
Always make sure that the device is well ventilated. In order to ensure adequate cooling, the
device must not be covered with towels or cloths. Avoid letting the enclosure become hot
through exposure to sunlight or strong spotlights.
Never expose the device to strong vibrations.

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1.2.1 Information on Abnormal Operation
If the permissible operating temperature is too high (over 75 °C), the device will shut down. As soon
as the temperature returns to within the normal operating range, the device will automatically be
switched on again.
The temperature of the FOHHN system is displayed in FOHHN AUDIO SOFT. Shutdown can also occur
if the product is exposed to direct sunlight or very high environmental temperatures. Reliable
operation is only guaranteed in compliance with the permissible ambient temperature range.
The device should be immediately inspected by a FOHHN AUDIO AG approved service partner if
the mains cable or power socket is damaged,
a foreign body or liquid has got into the interior of the device,
the device has been exposed to rain,
the device is not working normally, i.e. it is showing marked differences in performance,
the device is damaged (e.g. after a fall).
1.3 Storage and Transportation
Please note the following:
The device should only be transported in its original packaging
Store the device in a dry environment, with a constant ambient temperature, in order to
avoid condensation.
The permitted ambient temperature range for storing the device is -10 °C to +70 °C.
Due to fluctuations in temperature during transportation and storage, condensation my start
to build up on the surface of the device. Before operating the device, examine its surface for
any signs of moisture. If this is the case, allow the unpacked device to acclimatise for a
minimum of two hours in the environmental temperature before use.

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2. The Product
2.1 Product Description
The digital, multi-channel DSP amplifiers belonging to the DI-SERIES are equipped with FOHHN
AUDIO DSPs (digital signal processors). These DSPs contain (per amplifier channel) a programmable
EQ, Delay, X-Over and dynamic processor.
DI-SERIES DSP amplifiers are equipped as standard with four digital AES/EBU inputs and four Link
Outs. Digital inputs for Dante™ and Optocore networks, digital AES/EBU XLR inputs and analogue XLR
inputs are also optionally available. The standard outputs are terminal blocks designed for leads of
up to 6 mm² –the amplifiers are also optionally available with Speakon output connectors. All
amplifiers (regardless of the number of their output channels) always have four inputs with DSP input
processing –in other words: their four input channels can each be mixed in the DSP.
In addition, presets are stored that contain loudspeaker protection data and sound optimization data
for all FOHHN loudspeaker systems. These optimisations, together with multiband limiting, ensure
the best possible sound performance and operational safety. Custom created user presets can also
be stored.
Thanks to their integrated FOHHN AUDIO DSP, the amplifiers can be networked, remotely controlled
and remotely monitored. A single piece of control software, FOHHN AUDIO SOFT, provides access to
all DSP functions and presets. (The current version of this software can be downloaded free of
charge at: www.fohhn.com.)
At the heart of each amplifier is an in-house developed digital power supply that is significantly
responsible for the sound. It constantly analyses the supply voltage and processes this accordingly
(Power Factor Correction). The power supply enables the amplifier to deliver as much energy as
possible in the shortest possible time, thus enabling the full dynamic range to be reproduced over
the entire audible frequency spectrum during live music applications –while also turning the least
amount of energy into heat. The result is a significant increase in the available peak power over
several seconds. An integrated microprocessor equips the power supply with measuring, monitoring
and communications functionality. As a result, important factors such as temperature, supply voltage
and capacity can be monitored and controlled accordingly. In the event of mains overvoltage, the
amplifier will shut down.
The amplifier’s fans are temperature controlled and optimised for extremely quiet operation. The
fans are not used when the amplifier is in an idle state. The fan and filter foam can be manually
cleaned, without the need for tools.
An integrated Power-Up Delay enables sequential (remote) power-up of a number of connected
amplifiers within a rack. For larger installations and live sound applications involving multiple
systems, this function significantly eases the general handling.
The amplifiers are additionally equipped with two programmable switching contacts as well as a fault
contact for easy integration into building services.

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Overview of the different DI-SERIES product versions
The amplifiers are available as 2- or 4-channel product versions with respective power outputs of
1000 W / 2000 W / 4000 W at 4 Ohm, for example.
MODEL
POWER per channel and load
2 Ω
3 Ω
4 Ω
8 Ω
16 Ω
DI-4.1000
-
1300 W
1000 W
500 W
250 W
DI-2.2000
-
-
2000 W
1000 W
500 W
DI-4.2000
-
-
2000 W
1000 W
500 W
DI-2.4000
-
-
4000 W
2000 W
1000 W
The DI-4.1000 and DI-2.2000 are currently available. Further amplifiers are in planning.
2.2. Contents
Every product is examined in accordance with the highest quality and safety standards prior to
despatch.
Please check your product carefully for any signs of transport damage and, in the event of any
damage having occurred, inform your dealer and the transportation company immediately. Please
also check that the packaging contains all the components belonging to the device.
Your FOHHN system contains the following:
•1 × DI-SERIES DSP amplifier
•All plugs for rear panel connectors (inserted)
•1 × mains cable with PowerCON connector
•1 × Quick Start Guide
If the contents are incomplete, please contact your FOHHN dealer!
2.3 Unpacking
When unpacking the system, we recommend the following procedure:
1. Open the packaging and take out the product.
2. Examine the product for any visible signs of transport damage. If the product has been
damaged, inform the transport company immediately. A claim for transport damage can only
be made by the recipient (i.e. you). Keep the packaging for examination by the
transportation company.
3. As a general rule, always retain the packaging. Despatch the product in appropriate outer
packaging or in a suitable flightcase.

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3. Setting Up
3.1 Professional Rack Mounting
For professional installation in mobile 19-inch racks or cabinets, the amplifier is equipped with the
appropriate front and rear mounting brackets. The enclosure is torsion resistant. Please therefore
take care that the amplifier is well ventilated and cooled from both the front and the back during
use.
3.2 Connection Instructions and Controls
Each amplifier has a Power On/Off switch on the right side of the enclosure front panel.
Power On/Off switch on a DI-SERIES amplifier
Further connection of any cabling should be done while the amplifier is switched off. Similarly, the
mixing console should be switched on before the amplifier. This will avoid annoying and often
dangerous switch-on noises.

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3.2.1 Standard Connections
The following connectors can be found as standard on the rear panels of DI-SERIES amplifiers:
(1) mains
The mains cable is connected to this PowerCON power socket. The universal power supply (with
Power Factor Correction [PFC]) permits a supply voltage of 100 –240 Vac / 50/60 Hz, thus enabling
worldwide use of the amplifier.
The amplifier is only fully disconnected from the mains if the PowerCON plug is removed from the
socket!
(2) LED AUX power
This LED displays the current status of the 24 V / 5 W power supply for external small devices. When
it lights up green, the device is active.
(3) 24 V / 5 W AUX
This terminal block enables an additional external device (e.g. a small mixer or the AIREA ABX-1,
ABX-2 or ABX-3 Break Out Extensions) to be supplied with power.
(4) remote pwr
This terminal block enables multiple amplifiers within a rack to be connected to one another for a
sequential (remote) switch on/off.
Further information on this can be found in Chapter 4 of the user manual!
(5) switch
These terminal blocks serve as switching contacts for changing presets. They can be configured in
FOHHN AUDIO SOFT (see Chapter 3.4.2 “Switching Contact“).

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(6) fault
Error status can be reported via this isolated open/close contact. The error contact relais (1 x UM)
can be operated with a maximum 50 V and 500 mA.
(7) Fohhn-Net input
This terminal block is used to connect the amplifier to the FOHHN-NET remote control network.
Only use a FOHHN network adapter for this (NA-11 FOHHN-NET USB ADAPTER or NA-3 FOHHN-NET
ETHERNET ADAPTER).
(8) Fohhn-Net output
This terminal block allows FOHHN-NET control signals to be looped through.
(9) service port
This in an internal test connection, which must only be used for service purposes.
Nothing must be connected to this port, otherwise the functionality of the device may be adversely
affected!
(10) CH 1/2 input
Digital audio signals (AES/EBU) can be fed in using these terminal blocks. The terminals are intended
for both input channels CH 1 and CH 2.
(11) CH 1/2 link out
Digital audio signals (AES/EBU) can be looped through using these terminals. The terminals are
intended for both input channels CH 1 and CH 2.
(12) CH 3/4 input
Digital audio signals (AES/EBU) can be fed in using these terminal blocks. The terminals are intended
for both input channels CH 3 and CH 4.
These inputs are also available on 2-channel amplifiers!

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(13) CH 3/4 link out
Digital audio signals (AES/EBU) can be looped through using these terminals. The terminals are
intended for both input channels CH 3 and CH 4.
These outputs are also available on 2-channel amplifiers!
(14) + (15) Speaker Output CH 1 / CH 2
Loudspeaker systems are connected to these terminals (up to 6 mm² flexible or 10 mm² rigid
conductor cross-section).
(16) + (17) Speaker Output CH 3 / CH 4
Loudspeaker systems are connected to these terminals (up to 6 mm² flexible or 10 mm² rigid
conductor cross-section).
These outputs are only available on 4-channel amplifiers!

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3.2.2 Optional Connection Interfaces
All DI-SERIES product versions are optionally available with input interfaces for the Dante™ and
Optocore audio networks, as well as with XLR Interfaces for AES/EBU or analogue audio signals.
Besides the standard version terminal blocks, it is also possible for outputs to have Speakon
connectors. Any input option can be combined with any output option.
Input option AES/EBU XLR Interface
(1) Fohhn-Net input
The amplifier is connected to the FOHHN-NET remote control network via this EtherCON socket.
Only use a FOHHN network adapter for this (NA-11 FOHHN-NET USB ADAPTER or NA-3 FOHHN-NET
ETHERNET ADAPTER).
(2) Fohhn-Net link out
FOHHN-NET control signals are looped through via this Link Out socket.
(3) CH 1/2 in
Digital audio signals (AES/EBU) can be fed in via this XLR socket. The socket is intended for both input
channels CH 1 and CH 2.
(4) CH 1/2 link out
Digital audio signals (AES/EBU) can be looped through via this XLR socket. The socket is intended for
both input channels CH 1 and CH 2.

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(5) CH 3/4 in
Digital audio signals (AES/EBU) can be fed in via this XLR socket. The socket is intended for both input
channels CH 3 and CH 4.
These inputs are also available on 2-channel amplifiers!
(6) CH 3/4 link out
Digital audio signals (AES/EBU) can be looped through via this XLR socket. The socket is intended for
both input channels CH 3 and CH 4.
These outputs are also available on 2-channel amplifiers!
Input option Analog XLR Interface
(1) Fohhn-Net input
The amplifier is connected to the FOHHN-NET remote control network via this EtherCON socket.
(2) Fohhn-Net link out
FOHHN-NET control signals are looped through via this Link Out socket.
(3), (5), (7), (9) analog in
Analog audio signals can be fed in via these XLR sockets. Each of the sockets is intended for one input
channel (CH1 to CH4) respectively.

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(4), (6), (8), (10) link out
Analog audio signals can be looped through via these XLR sockets. Each of the sockets is intended for
one input channel (CH1 to CH4) respectively.
Input option Dante™ Interface
(1) Primary
Digital audio signals (Dante™) and remote control signals (FOHHN-NET) can be fed in via this RJ-45
input (1000 Base-T Ethernet).
(2) Secondary
This RJ-45 input (1000 Base-T Ethernet) is exclusively used for redundant cabling.
Input option Optocore Interface
(1) Link 1
Digital audio signals (Optocore) and remote control signals (FOHHN-NET) can be fed in via this LWL
input.
The input can be used both for redundant cabling (Optocore Ring) and as a Link!

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(2) Link 2
Digital audio signals (Optocore) and remote control signals (FOHHN-NET) can be fed in via this LWL
input.
The input can be used both for redundant cabling (Optocore Ring) and as a Link!
Output option Speakon sockets
(1) + (2) Speaker Output CH 1 / CH 2
Loudspeaker systems are connected to these Speakon connectors.
(3) + (4) Speaker Output CH 3 / CH 4
Loudspeaker systems are connected to these Speakon connectors.
These outputs are only available on 4-channel amplifiers!

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3.2.3 Status Displays
Status displays on DI-SERIES amplifiers take the form of illuminated symbols on the front panel of the
enclosure:
Status LEDs for a 4-channel amplifier
input 1 / 2 / 3 / 4
If audio signals are detected, the symbols for the corresponding input channels light up white. If
there is a signal overload, the corresponding symbols turn red.
output 1 / 2 / 3 / 4
If audio signals are transmitted from the DSP amplifiers, the symbols for the corresponding output
channels light up white. If there is a signal overload, the corresponding symbols turn red.
The output 3 and output 4 symbols are only available on 4-channel amplifiers!
send
This symbol lights up if FOHHN-NET control signals are transmitted from the DSP amplifier.
receive
This symbol lights up if the DSP amplifier receives FOHHN-NET control signals.
protect
This symbol lights up if there is an error during operation.

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ready
This symbol lights up when the amplifier is ready for use.
3.3 Configuration
Using the FOHHN-NET network, you can remotely control and monitor the functionality of your
FOHHN amplifier’s integrated digital signal processors (DSP). For this you will need a Windows PC
with FOHHN AUDIO SOFT (Version 5.0.3 or later) installed.
3.3.1 System Requirements
To use FOHHN AUDIO SOFT, you need a commercially available computer with the following:
•Computer and processor: x86- or x64 multi-core system
•Memory (RAM): 4 Gigabyte (GB) RAM
•Hard disk: 40 Megabyte (MB) of free disk space
•Display: Minimum resolution 1366 x 768
•Operating system: Microsoft Windows 7 SP1 or Windows 10
•.NET-Version: Microsoft .NET Framework 4.6.1
•Additional requirements: current status of the operating system
Further information can be found in the separate FOHHN AUDIO SOFT user manual. You can
download this from the FOHHN website www.fohhn.com
3.3.2 Downloading and Installing FOHHN AUDIO SOFT
FOHHN AUDIO SOFT is directly compatible with all FOHHN active DSP systems. Therefore, you do not
need any special DI-SERIES version of the software. Regardless of the amplifier, you can always work
with the same software and within the same user interface.
The current version of FOHHN AUDIO SOFT can be downloaded free of charge from
www.fohhn.com.
Proceed as follows to install FOHHN AUDIO SOFT on your computer:
1. Download the latest version of FOHHN AUDIO SOFT to your computer.
2. Locate the Fohhn_Audio_Soft_X.X.X_Setup.exe file on your computer (X.X.X represents the
respective version number).
3. Start the installation program by double-clicking on the file: Follow the on-screen instructions.
4. Click on Install to install the program on your computer. Also confirm in the User Account Control
dialog if this appears.