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.
2
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
3
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
4
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.
5
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.
6
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
7
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.
8
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.
9
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.
10
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.
11
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.
12
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“).
13
(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!
14
(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!
15
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.
16
(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.
17
(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!
18
(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!
19
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.
20
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.
21
5. Click on Finish to complete the installation.
The software is immediately ready for use following installation and can either be opened via the
program symbol on the desktop, or via the Start > All Programs > Fohhn Audio AG > Fohhn Audio Soft
path.
3.3.3 FOHHN-NET Cabling and ID Allocation
To control a number of DI-SERIES amplifiers, each system in the FOHHN-NET must be allocated its
own specific ID. Using this ID, each individual FOHHN amplifier can be clearly identified and
controlled from within FOHHN AUDIO SOFT.
All amplifiers have a factory setting of ID 1.
Duplicated IDs lead to ID conflict. In such a situation, it will no longer be possible to control
the amplifiers concerned.
ID allocation for individual amplifiers:
In order for an ID to be allocated, each amplifier must first be connected to FOHHN AUDIO SOFT.
Proceed as follows:
1. Connect the FOHHN amplifier to the mains power.
2. Depending on the input interface option, connect an NA-3 or NA-11 FOHHN-NET Adapter to
the computer, i.e. for amplifiers with AES/EBU terminal connectors, or XLR interface for
AES/EBU or Analog.
For amplifiers with a Dante interface, you need an Ethernet Switch.
For amplifiers with an Optocore interface, you need an Optocore network convertor.
3. Connect the Adapter, Ethernet Switch or Optocore convertor to the amplifier using an
appropriate cable.
4. Switch on the amplifier.
5. Start FOHHN AUDIO SOFT. The selected FOHHN-NET adapter will automatically be
recognized.
For amplifiers with a Dante interface, this will be directly recognized. As a FOHHN-NET Node
the IP Address of the Dante interface will be displayed. This will automatically be found, but
it can also be manually configured.
6. When FOHHN AUDIO SOFT opens, an automatic search starts that results in the listing of all
correctly connected FOHHN amplifiers.
22
If no amplifier is shown, check all the connections and re-run the search. When doing so, please also
note the ID search range.
Proceed as follows:
1. In the Devices menu, click on the Search Device / Network Scan dialog.
2. If the amplifier is still not shown, check the mains power supply and/or the network cabling.
Then repeat Step 1.
If an amplifier is recognized, it appears with ID 1 (factory setting).
To change the ID directly in the Find Devices dialog, proceed as follows:
1. Click with the right mouse button on a loudspeaker system in the dialog’s list view.
2. In the context menu select Change Fohhn-Net ID.
3. In the dialog with the same name, enter a new ID for the amplifier. Make sure that this ID is
not already in use.
Confirm this by clicking Ok: The FOHHN amplifier will now have a newly assigned ID.
You can also change the ID of a FOHHN amplifier at any time while it is in use. To do this, the system
must be in the FOHHN-NET. Proceed as follows:
1. Open the Device List view, either via the View menu or via the corresponding button on the
Toolbar.
2. Click with the right mouse button on an amplifier in the list display.
3. In the context menu select Change Fohhn-Net ID.
4. In the same dialog, give the amplifier a new ID
5. Confirm this by clicking Ok: The FOHHN amplifier will now have a newly assigned ID.
Further information on setting up a FOHHN-NET and on FOHHN-NET ID allocation can be found in
Chapter 4.1 “Fohhn-Net Setup” of the FOHHN AUDIO SOFT user manual.
23
3.3.4 Loading Loudspeaker Presets
In their ex-factory state, DI-SERIES amplifiers do not have any preset limiters. Therefore, to ensure
safe operation of all connected loudspeakers, the appropriate loudspeaker presets must be loaded
into FOHHN AUDIO SOFT. Examples are saved in a preset list on the device. All available loudspeaker
presets can also be loaded from a database.
Further information on loading loudspeaker presets can be found in Chapter 4.2 “Presets” of the
FOHHN AUDIO SOFT user manual.
3.3.5 Updating the Firmware
The range of functions in your FOHHN system depends not only on FOHHN AUDIO SOFT, but also on
the firmware in your devices and on the loudspeaker database. From time to time, updates are
available for these sets of data, which can be downloaded into FOHHN AUDIO SOFT (internet
connection required!).
Further information on this can be found in Chapter 6.1 “Updating the Firmware” of the FOHHN
AUDIO SOFT user manual.
3.3.6 Connecting All Devices
Connect your amplifier to the audio source and the loudspeakers, using the relevant inputs and
outputs (see Chapter 3.2 “Connection Instructions and Controls”).
Connecting a DI-Series amplifier
24
3.3.7 Gain Structure and Signal Chain
Fig. 1: Overview of the signal chain on a DI-Series amplifier channel
There are many gain options, both inside and outside the FOHHN DSP, that enable flexible handling
of any application – even in complex situations where the matrix mixing functions are used.
Remember to check the level of all steps in the signal chain for each output channel in order to
achieve best possible audio results.
The following instructions and the examples on page 26 illustrate this approach.
Important tips
The best level is high enough to avoid noise and low enough to allow headroom for peaks!
SPEAKER PRESETS
Using FOHHN speaker presets ensures that, within the FOHHN DSP, no audible clipping can occur.
ANALOG INPUTS
Please pay particular attention to the levels when using analog input signals! Analog signals are
converted into digital audio signals. This always presumes a definition for 0 dBFS. FOHHN defines +15
dBu as 0 dBFS. However, this definition can vary significantly among manufacturers of mixing
consoles and other similar equipment.
Digital levels
25
Example 1
Standard signal chain, input-, routing- and outputgain 0 dB
-> no change of input signal level
Example 2
Mix level too low; higher input gain also amplifies
noise
Example 3
Mix level too high leading to input signal clipping.
Lower input gain does not prevent audible clipping!
Example 4
Incorrect gain structure leads to loss of signal
integrity; noise level rises!
Example 5
Optimum level for full signal integrity and sufficient
headroom for peaks.
26
3.3.8 Matrix Functions and DSP Routing
Fohhn DSP – Routing Matrix Functions
Fig. 1: Four input channels are mixed to one output channel.
The mix volume of each input can be adjusted by one routing gain.
Fig. 2: Four input channels are mixed to two output channels.
The mix volume of each input to a specific output can be adjusted via one routing gain.
27
Fig. 3: Four input channels are mixed to four output channels.
The mix volume of each input to a specific output can be adjusted via one routing gain.
28
3.3.9 Integration into a Dante™ Network
For amplifiers with a Dante™ interface, connection to the FOHHN-NET is via an Ethernet switch, to
which an appropriate Dante device must also be connected. For control via PC, Audinate’s Dante
Controller software is required in addition to FOHHN AUDIO SOFT (see Chapter 3.3.3 “FOHHN-NET
Cabling and ID Allocation”).
You can download the Dante Controller software free of charge from here:
https://www.audinate.com/products/software/dante-controller
Example: Control of DI-Series amplifiers via computer and Ethernet switch using simple cabling.
29
Example: Control of DI-Series amplifiers via computer and Ethernet switch using redundant cabling.
(Here, all devices must be in “Redundant Mode”.)
30
All Dante™ input interface parameters (e.g. the audio routing within a Dante network) must be
configured with the Dante Controller software.
Dante™ Interface Firmware Update
To update the interface’s Dante firmware, the Dante Firmware Update Manager software is
required. You can download this free of charge from the following URL:
https://www.audinate.com/products/firmware-update-manager
Dante Firmware files have the extension .dnt and can be downloaded from here:
https://www.fohhn.net/download/dante/
Example: DI4Amp_1.0.0.dnt for Dante devices in the DI-SERIES.
Perform the update as follows:
1. Start the Dante Firmware Update Manager.
2. Select the appropriate network interface and confirm the selection with Next.
3. Select Update Dante Firmware.
4. Select the appropriate .dnt file and confirm the selection with Next.
5. Select the listed Dante devices that are to be updated and click on Start.
31
6. After a full update, the Dante devices should be restarted by switching off then on.
The Dante Firmware update only updates the firmware of the integrated Dante module. The
FOHHN device firmware is unaffected and must, if necessary, be separately updated!
Here you can find all of Audinate’s technical documentation relating to Dante:
https://www.audinate.com/resources/technical-documentation
Here you can find some helpful guidance on identifying a Dante device when the IP address is not
known:
https://www.audinate.com/faq/how-can-i-locate-dante-device-static-ip-address-unknown-subnet
32
3.3.10 Integration into an Optocore Network
For amplifiers with an Optocore interface, connection to the FOHHN-NET is via a network converter
(e.g. the Optocore X6R-FX), to which an appropriate Optocore device (e.g. a mixing desk) must also
be connected. For control via PC, the Optocore Control Software is required in addition to FOHHN
AUDIO SOFT.
Example: Control of DI-Series amplifiers via computer and Optocore network converter using redundant,
annular cabling (Optocore Ring)
33
3.3.11 Integration into the AIREA-NET
Amplifiers with an AES/EBU XLR Interface have the possibility of being integrated into a FOHHN
AIREA system: The system has its own network for transmitting supply voltage, digital audio signals
(AES/EBU) and FOHHN-NET control signals – the AIREA-NET. For connection to this, an AIREA BREAK
OUT EXTENSION ABX-4 is required.
3.3.12 Renaming Devices and Output Channels
For better identification within FOHHN AUDIO SOFT it is recommended that, in an installation
involving a number of DI-SERIES products, the individual amplifiers and/or their output channels are
each given separate names. Proceed as follows:
1. Open the Device List or Devices view, either via the corresponding entry in the Menu view or
via the respective button on the Toolbar.
2. Click with the right mouse button on the required system in the list (Device List), or in the
workspace (Devices).
3. In the context menu, select the Rename Device option.
4. Enter a new name for the device in the Edit name dialog then close this by clicking OK.
5. To name individual output channels: In the Devices view, click on the desired amplifier with
the right mouse button and select the Rename Channels option. Renaming individual output
channels is also possible in the Output Channels view.
The new name will now appear in the Device List, Devices and Channels views.
3.4 Further Functions
3.4.1 Auto Power Save
DI-SERIES amplifiers have a configurable Auto Power Save mode, which enables energy to be saved
and the longevity of the device to be extended. If no audio signal is received, the amplifier switches
into Power Save Mode. As soon as an audio signal is detected, the amplifier is immediately ready for
use again. In Power Save Mode, the amplifier’s power consumption is < 10 W and no fans are used.
The amount of time before the device switches to Auto Power Save can be set as required – between
1 second and 12 hours. The mode can also be completely deactivated.
We recommend using the Auto Power Save function with a switch-off time of 10 seconds! This
function keeps the amplifier cool, even during short pauses and, as such, prevents thermal limiting.
Furthermore, any noise will be fully suppressed.
34
Proceed as follows to set up Auto Power Save in FOHHN AUDIO SOFT:
1. Select one or more amplifiers in the Device List and, with a right mouse click, open the
context menu.
2. Select the Options entry. This opens the Advanced device settings configuration dialog.
3. In here, select one or more amplifiers and, with a right mouse click, open the context menu.
4. Select Set auto power save. The Set auto power save time window will open. (You can also
open this window via the corresponding button at the bottom left of the Advanced device
settings dialog.)
5. From the drop-down list (bottom left), select the desired switching time and confirm your
selection by clicking OK.
Note: During acoustic measurement of your loudspeaker systems, too short a switch-off time can
lead to inaccuracies. We recommend a switch-off time of one hour or longer while you carry out
your measurements.
35
3.4.2 Switching Contact
DI-SERIES amplifiers have two contact inputs (see Chapter 3.2 “Connection Instructions and
Controls”), via which a preset change can be triggered.
This switching contact can be configured in FOHHN AUDIO SOFT:
1. Select one or more amplifiers in the Device List then, with a right mouse click, open the
context menu.
2. In here, select the Options entry. This will open the Advanced device settings configuration
dialog.
3. In here, select one or more amplifiers then, with a right mouse click, open a further context
menu.
4. Select the entry Set switch config. This will open the Input contact configuration window.
5. Select a setting from the drop-down menus for the “close” (Switch 1/2 close) and “open“
(Switch 1/2 open) status: for example, you can deactivate the current status (Disabled) or
load one of up to 100 presets (Load Preset).
6. Confirm your selection by clicking OK.
When the amplifier is switched on, the selected presets will be loaded according to the current
“close” or “open” status of the switching contact.
Before configuring the switching contacts, we recommend that you first save all user presets!
Further information on saving user presets can be found in the FOHHN AUDIO SOFT user manual.
You can download this from the Fohhn website: www.fohhn.com
36
3.4.3 Password Lock
DI-SERIES amplifiers and their parameter settings can be password protected (or locked) to prevent
any subsequent changes. This password protection can be set up in FOHHN AUDIO SOFT.
Further information on password protection can be found in Chapter 6.6 “Password Lock” of the
FOHHN AUDIO SOFT user manual. You can download this from the Fohhn website:
www.fohhn.com
37
4. Remote Switch-On and Sequential Switch-On
If multiple DI-SERIES amplifiers are being used, these can be linked to one another via the remote
pwr in or out connector (see Chapter 3.2.1 “Standard Connections”) and thus be sequentially
switched on. Remotely controlled switch-on / switch-off is also possible.
Cabling
Switch states for 12 V control voltage
At the remote pwr input is a control voltage that shuts down the amplifier. The control voltage can
be 9 – 48 V, the supply is therefore no greater than 10 mA per device.
4.1 Sequential Switch-On / -Off
In order to avoid an overload and the subsequent triggering of a circuit breaker, a number of
amplifiers can be linked together in such a way that they are switched on one after the other – each
time with a delay.
If the supply voltage for all three amplifiers is simultaneously and centrally switched on, amplifier 1 will delay the
switch-on of amplifier 2. Amplifier 2 will, in turn, delay the switch-on of amplifier 3 etc.
38
4.2 Sequential Remote Switch-On / Switch-Off
The linked amplifiers can also be switched on and off via remote control.
If more than eight amplifiers are used in this configuration, we recommend a control voltage which
is greater than 12 V to ensure reliable control!
If a control voltage is not present at the remote pwr in of amplifier 1, all amplifiers will switch on one after the other.
If a control voltage is present, all amplifiers will be/remain switched off.
Note:
A remote switch-on/switch-off is only possible if the power switch on all the devices is
turned on.
The remote activation has the same function as the power switch.
39
4.3 Examples
In the following examples it is assumed that the power switches on the front panels of all the
amplifiers are switched on, all devices are connected to a power supply and mains voltage is present!
Example 1: Sequential switch-on within an amplifier stack after connection to the mains power
supply cable.
Example 2: Remote switch-on / switch-off of the stack while devices are connected with mains
40
Example 3: Remote switch-on / switch-off of part of the stack while devices are connected with
mains
Example 4: Logical operation: Amplifiers 4 and 5 are switched on at the same time as amplifiers 1 to
3, but have a separate switch-off option.
41
Example 5: Remote toggle switching of two stacks
42
5. Technical Specifications
5.1 DI-2.2000
Amplifier technology Class D
Output power 2 x 2000 W / 4 Ohm
2 x 1000 W / 8 Ohm
(1 kHz, THD+N < 1 %)
Minimum impedance 4 Ohm
Input channels 4
Amplifier outputs 2
DSP Routing (Matrix) 4 x 2
Frequency response 20 Hz – 20 kHz
S/N ratio >100 dB/A
THD+N 0.08 %
(1 kHz, 8 Ohm, 3 dB below clipping)
Dynamic range >120 dB
Remote control Fohhn-Net over RS-485, Fohhn Audio Soft
Remote monitoring Temperature, Protect, AES/EBU Signals, Power
Supply, Fohhn-Net, Fohhn Audio Soft
Fault contact 1 x Relais, 2 x UM, 3-pin Phoenix
Switching contact Load Preset, Standby On/Off
Password protection yes
Auto Power Save yes, time adjustable 1 s to 12 h, or never active
Protective circuit over voltage protection,
over current protection,
over temperature protection,
short circuit protection,
DC protection
power on delay,
soft start and inrush current limit
Power supply 100 – 240 V AC 50/60 Hz,
universal power supply with Power Factor
Correction (PFC)
Power consumption Maximum (RMS) 1200 W, idle state 50 W, Auto
Power Save 10 W, Standby 5 W, Power On/Off
switch / Remote power off 2 W
43
Heat loss Maximal 200 W, 680 BTU/h, 172 kcal/h
(Pink Noise, 6 dB crest, 1/4 Pmax)
Temperature range 0 – 40°C
Cooling temperature-controlled fan
Weight 9.4 kg
Dimensions (W x H x D) 2 HE / 19″, 485 x 89 x 425 mm
Controllers
Digital signal processors 2
Independent limiters 12
Selective 3-band limiting bass/mid/high
Band-specific time constants yes
Filter technology 80-bit double precision
Input AES/EBU 32 kHz – 96 kHz, 16/24 bit
Input DSP processing yes
FIR filter yes
Input Gain -80 dB – +12 dB
Routing Gain -80 dB – +12 dB
Output Gain -80 dB – +12 dB
EQ 6 x 10 fully parametric filters,
Gain +/-12 dB, Frequency 10 Hz – 20 kHz,
Q 0.1 – 100
Limiter, Compressor 6
Noise Gate 6
X-over 6 x Linkwitz-Riley 4th Order (24 dB / Octave),
High pass 10 Hz – 20 kHz,
Low pass 10 Hz – 20 kHz
Delay 2 x 0 – 350 ms (0 – 120 m) outputs,
4 x 0 – 88 ms (0 – 30 m) inputs
User presets 100
Speaker presets 100
System latency 1.2 ms
44
Connections and Controls
Controls Power On/Off switch
Mains connection 1 x PowerCON
Fault contact (open/close) 1 x Phoenix 3-pin
Switching contact 1 and 2 1 x Phoenix 3-pin
Remote power in/out 2 x Phoenix 2-pin
Power supply for external small devices
24 V / 5 W 1 x Phoenix 2-pin
24 V / 5 W Power LED green = on
Standard Input (AES/EBU)
Inputs 2 x Phoenix 3-pin AES/EBU,
1 x Phoenix 3-pin Fohhn-Net
Outputs 2 x Phoenix 3-pin AES/EBU,
1 x Phoenix 3-pin Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU link out from input
Latency 0.0 ms
Input Interface (AES/EBU XLR), optional
Inputs 2 x XLR AES/EBU, 1 x etherCON Fohhn-Net
Output 2 x XLR AES/EBU, 1 x etherCON Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU link out from input
Latency 0.0 ms
Input Interface (Analog XLR), optional
Inputs 4 x XLR analog, 1 x etherCON Fohhn-Net
Outputs 4 x XLR analog, 1 x etherCON Fohhn-Net
Signal inputs Analog, max. level +15 dBu
Signal outputs Analog link out from input
45
Frequency response 20 Hz – 20 kHz
THD < 0.003 % typ.
< 0.0005 % 1 kHz 0 dBu
S/N ratio > 110 dB/A
Input impedance 10 kOhm
Latency 1.0 ms
Input Interface (Dante), optional
Inputs 2 x RJ-45 1000BASE-T Ethernet,
Dante and Fohhn-Net
Outputs -
Latency Dante +0.6 ms
Input Interface (Optocore), optional
Inputs 2 x LWL,
Optocore and Fohhn-Net
Standard Output (terminal blocks)
Outputs 1 x Phoenix 4-pin
Conductor cross section max. 6 mm² flexible, 10 mm² rigid
Output option (Speakon)
Outputs 2 x Speakon
Display (front)
Receive / Send LED remote control, Fohhn-Net
Ready LED blue = Power on
blue flashing = Sign
Protect LED red = Error / Protect / Standby
Input LED 4 x input signal LED,
white = signal (> -50 dBFS),
red = clip (> -3 dBFS)
46
Output LED 2 x output signal LED,
white = signal (> -50 dBFS),
red = clip (> -3 dBFS)
47
5.2 DI-4.1000
Amplifier technology Class D
Output power 4 x 1000 W / 4 Ohm
4 x 500 W / 8 Ohm
(1 kHz, THD+N < 1 %)
Minimum impedance 3 Ohm
Input channels 4
Amplifier outputs 4
DSP routing (Matrix) 4 x 4
Frequency response 20 Hz – 20 kHz
S/N ratio >100 dB/A
THD+N 0.08 %
(1 kHz, 8 Ohm, 3 dB below clipping)
Dynamic range >120 dB
Remote control Fohhn-Net over RS-485, Fohhn Audio Soft
Remote monitoring Temperature, Protect, AES/EBU Signals, Power
Supply, Fohhn-Net, Fohhn Audio Soft
Fault contact 1 x Relais, 2 x UM, 3-pin Phoenix
Switching contact Load Preset, Standby On/Off
Password protection yes
Auto Power Save yes, time adjustable 1 s to 12 h, or never active
Protective circuit over voltage protection
over current protection,
over temperature protection,
short circuit protection,
DC protection,
power on delay,
soft start and inrush current limit
Power supply 100 – 240 V AC 50/60 Hz,
universal power supply with Power Factor
Correction (PFC)
Power consumption Maximum (RMS) 1200 W, idle state 70 W, Auto
Power Save 10 W, Standby 5 W, Power On/Off
switch / Remote power off 2 W
Heat loss Maximal 200 W, 680 BTU/h, 172 kcal/h
(Pink Noise, 6 dB crest, 1/4 Pmax)
48
Temperature range 0 – 40°C
Cooling temperature-controlled fan
Weight 9.4 kg
Dimensions (W x H x D) 2 HE / 19″, 485 x 89 x 425 mm
Controllers
Digital signal processors 2
Independent limiters 20
Selective 3-band limiting bass/mid/high
Band-specific time constants yes
Filter technology 80-bit double precision
Input AES/EBU 32 kHz – 96 kHz, 16/24 bit
Input DSP processing yes
FIR filter yes
Input Gain -80 dB – +12 dB
Routing Gain -80 dB – +12 dB
Output Gain -80 dB – +12 dB
EQ 8 x 10 fully parametric filters,
Gain +/-12 dB, Frequency 10 Hz – 20 kHz,
Q 0.1 – 100
Limiter, Compressor 8
Noise Gate 8
X-over 8 x Linkwitz-Riley 4th Order (24 dB / Octave),
High pass 10 Hz – 20 kHz,
Low pass 10 Hz – 20 kHz
Delay 4 x 0 – 350 ms (0 – 120 m) outputs,
4 x 0 – 88 ms (0 – 30 m) inputs
User presets 100
Speaker presets 100
System latency 1.2 ms
49
Connections and controls
Controls Power On/Off switch
Mains connection 1 x PowerCON
Fault contact (open/close) 1 x Phoenix 3-pin
Switching contact 1 and 2 1 x Phoenix 3-pin
Remote power in/out 2 x Phoenix 2-pin
Power supply for external small devices
24 V / 5 W 1 x Phoenix 2-pin
24 V / 5 W Power LED green = on
Standard Input (AES/EBU)
Inputs 2 x Phoenix 3-pin AES/EBU,
1 x Phoenix 3-pin Fohhn-Net
Outputs 2 x Phoenix 3-pin AES/EBU,
1 x Phoenix 3-pin Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU link out from input
Latency 0.0 ms
Input Interface (AES/EBU XLR), optional
Inputs 2 x XLR AES/EBU, 1 x etherCON Fohhn-Net
Outputs 2 x XLR AES/EBU, 1 x etherCON Fohhn-Net
Signal inputs AES/EBU 32 kHz – 96 kHz, 16/24 bit
Signal outputs AES/EBU Link Out from input
Latency 0.0 ms
Input Interface (Analog XLR), optional
Inputs 4 x XLR analog, 1 x etherCON Fohhn-Net
Outputs 4 x XLR analog, 1 x etherCON Fohhn-Net
Signal inputs Analog, max. level +15 dBu
Signal outputs Analog link out from input
50
Frequency response 20 Hz – 20 kHz
THD < 0.003 % typ.
< 0.0005 % 1 kHz 0 dBu
S/N ratio > 110 dB/A
Input impedance 10 kOhm
Latency 1.0 ms
Input Interface (Dante), optional
Inputs 2 x RJ-45 1000BASE-T Ethernet,
Dante and Fohhn-Net
Outputs -
Latency Dante +0,6 ms
Input Interface (Optocore), optional
Inputs 2 x LWL,
Optocore and Fohhn-Net
Standard Output (terminal block)
Outputs 2 x Phoenix 4-pin
Conductor cross section max. 6mm² flexible, 10 mm² rigid
Output option (Speakon)
Outputs 4 x Speakon
Display (front)
Receive / Send LED Remote control, Fohhn-Net
Ready LED blue = Power on
blue flashing = Sign
Protect LED red = Error / Protect / Standby
Input LED 4 x input signal LED,
white = signal (> -50 dBFS),
red = clip (> -3 dBFS)
51
Output LED 4 x output signal LED,
white = signal (> -50 dBFS),
red = clip (> -3 dBFS)
52
6. Troubleshooting
The following table describes how errors can be determined and shows the corrective measures that
are recommended.
Problem
Probable Cause
Possible Remedies
No sound is audible. However,
there is an audio signal.
The In- and Output routing in the
User DSP is not correct.
Check the DSP settings in FOHHN
AUDIO SOFT.
The cable connection between
amplifier and loudspeaker is
defective or not plugged in.
Check the cable or connect the
loudspeaker to the amplifier.
The amplifier is not recognised by
FOHHN AUDIO SOFT.
Several products have the same
FOHHN-NET ID. (An ID conflict will
be displayed in FOHHN AUDIO
SOFT.)
Change the ID - no ID can appear
twice see 3.3.4 “Fohhn-Net
Cabling and ID Allocation”).
The ID search range is restricted.
Extend the search range from ID 1
to 254.
The FOHHN-NET plug (see 3.3.1
“Configuration”) is not inserted.
Depending on the product variant,
connect the system to the
appropriate adapter.
The Aux power LED and the
symbols on the device front panel
are not lighting up.
There is no supply voltage.
Check whether a supply voltage is
present
230 V not available. Mains fuse
tripped.
Measure the supply voltage at the
socket and check the fuse.
The send and receive LEDs are not
lighting up.
The cable for the FOHHN-NET
connection is defective or not
plugged in.
Check the cable or connect the
amplifier to an appropriate
FOHHN-NET adapter.
The protect symbol lights up
There is an operational error.
Contact the Service department at
FOHHN AUDIO AG immediately.
Distortion (Clipping) is audible.
No speaker preset loaded
Load the preset for the speakers
used in FOHHN AUDIO SOFT.
The output impedance is too low.
Short circuit.
Check the impedance of the
loudspeakers (all outputs). Check
all outputs for a short circuit.
Input overdriven
Check the input level
If your problem does not appear in the above table, or if the problem is not fixed using the suggested
solutions, please contact us at the following address:
FOHHN AUDIO AG
Hohes Gestade 3-8 Tel. +49 7022 93323-0 www.fohhn.com
72622 Nürtingen Fax +49 7022 93324-0 info@fohhn.com
Germany
53
7. Service and Repair
Servicing and/or repairs should only be undertaken by suitably qualified, FOHHN-trained personnel.
Do not carry out any servicing or any repairs to the device beyond what is listed under “Maintenance
Measures” (below) or advised in the “Cleaning Fan Filter Foam Without Tools” section.
For details of a FOHHN® Service provider in your area, please contact us at the address on the
previous page.
Keep the packaging for your device so that, in the event of any problem occurring, it can be returned
in its original packaging. This will minimize the risk of any potential damage during transportation.
7.1 Maintenance Measures
• To clean your FOHHN amplifiers, only use a dry or slightly damp, well wrung out cloth.
• Do not use any aggressive cleaning agents, waxes or solvents (such as cleansing alcohol or
paint thinner), as these could spoil the appearance of the device and/or affect the paintwork
on the enclosure.
• There are no user-serviceable parts within the device.
• The device must only be repaired by suitably qualified personnel.
7.2 Cleaning Fan Filter Foam Without Tools
Clean the filter foam regularly by blowing on it so that your FOHHN amplifier works smoothly over a
long period. Impurities largely depend on the environment in which the amplifier is used.
To clean, proceed as follows:
1. Using your hands, remove the enclosure’s front panel, which is attached with magnets. No tools
are needed for this.
54
2. The filter foam that is to be cleaned can be found in the front panel’s fan filter holder. Remove this
filter foam and clean it, e.g. by blowing on it.
3. Put the cleaned filter foam back in the filter holder and re-attach the front panel to the front of the
enclosure.
55
8. Appendix
8.1 Environmental Information
Please note that this product must not be disposed of in general household waste. It must be taken
to a disposal centre for electrical/electronic waste. Please also note any applicable national or local
regulations. Further information on these and on appropriate waste disposal facilities can be
obtained from your city/town council as well as from your local distribution partner.
8.2 CE Marking and Declaration of Conformity
This DSP amplifier complies with the currently applicable conditions of EMC
law and, as such, carries the CE marking.
The relevant Declarations of Conformity are available on request from
Fohhn Audio AG, 72622 Nürtingen
8.3 Trademarks
All trademarks and brand names referred to in this manual, which may be protected by third parties,
are subject to the provisions of trademark law and the title rights of their respective owners. All
trademarks, trade names or company names appearing here are, or may be, trademarks or
registered trademarks of their respective owners. All rights are reserved, with the exception of those
specifically granted.
In the absence of an explicitly labelled registered trademark in this manual, it cannot be necessarily
concluded that a name is free of third-party rights.
8.4 Protection Classes and Protection Types
Protection Class I: All the equipment’s electrical conductive components are
connected with low resistance to the protective earth conductor of the installation.
IP21 The device’s protection type (protection against solid objects with ≥ 12.5 mm in
diameter, protection against manual contact and protection against dripping water)
56
8.5 Disclaimer and Copyright
Disclaimer
The contents of this user manual have been created with great care. However, FOHHN AUDIO AG
cannot guarantee that the information therein (images, text and other representations) is always
complete, correct and current. FOHHN AUDIO AG therefore reserves the right to make changes or
additions to the given information at any time. Neither Fohhn Audio AG (as a public limited
company), nor its Executive Board or employees take any responsibility for direct or indirect damage,
including loss of profit, which arises as a result of, or in connection with the information in this
manual.
Copyright
This manual as a whole, including its contents and works is, as such, subject to German copyright law.
The reproduction, editing, distribution and any other kind of use outside the limits of the copyright
requires the written consent of FOHHN AUDIO AG.
8.6 Contact Address
FOHHN AUDIO AG
Hohes Gestade 3-8
72622 Nürtingen
Germany
Tel. +49 7022 93323-0
Fax +49 7022 93324-0
www.fohhn.com
info@fohhn.com
Fohhn on Social Media
DB0082X 08/18
Loading...