FOURAUDIO HD2, HD2Control User Manual
Manual for HD2 and HD2Control
Version 1075.4.2
11.12.2009
Contents
1 HD2 In- and Outputs.....................................................................................................................3
1.1 Analog Inputs........................................................................................................................3
1.2 Analog Outputs.....................................................................................................................3
1.3 Digital Inputs and Outputs....................................................................................................4
2 Front panel....................................................................................................................................5
3 Basic Usage...................................................................................................................................8
3.1 Network Setup.......................................................................................................................8
3.1.1 Resetting To The Default IP Address (192.168.1.15)....................................................9
3.1.2 Setting A Specified IP Address......................................................................................9
3.1.3 Network troubleshooting...............................................................................................9
4 The remote software HD2Control..............................................................................................10
4.1 Installation...........................................................................................................................10
4.2 Starting the Software...........................................................................................................10
4.3 Establishing a connection to the HD2.................................................................................10
4.4 Basic Concept of Operation................................................................................................12
4.4.1 Status Bar....................................................................................................................12
4.5 System Tab (simple mode)..................................................................................................13
4.5.1 Selecting (Recalling) a Setup......................................................................................13
4.5.2 Select Different Input..................................................................................................13
4.6 Advanced Tab .....................................................................................................................13
4.6.1 FIR Filters....................................................................................................................13
4.6.2 Setups..........................................................................................................................14
4.6.3 Configuration Wizard..................................................................................................15
4.6.4 Firmware Update.........................................................................................................18
4.6.5 Erase Flash Mem / Reset to Factory Defaults.............................................................19
4.6.6 Download / Upload the Complete Configuration........................................................19
4.6.7 Locking/disabling the front panel operation...............................................................19
4.6.8 Change the 4 digit security PIN..................................................................................19
4.7 In-/Outputs Tab...................................................................................................................20
4.8 Limiter Tab..........................................................................................................................22
4.9 Input and Output Tabs.........................................................................................................23
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1 HD2 In- and Outputs
The full-blown HD2 provides several in- and outputs:
1. 2 dual range analog inputs (XLR) or optionally 4 single range inputs (XLR)
2. 8 analog outputs (XLR)
3. 2 digital inputs (selectable: balanced XLR or opto)
4. 2 digital outputs (balanced XLR and opto)
5. 1 Ethernet jack
6. 1 RS 232 connector
In detail
1.1 Analog Inputs
The HD2 provides 2 stereo AD converters with a maximum input voltage of 28.5 dBu.
They can be operated in stacked/dual range or unstacked/single range mode. In stacked/dual range
mode, the left and right channel of one AD converter are combined to form a dual range converter with
a higher dynamic range. The first versions of HD2 usually are set to stacked mode. In later versions,
the AD converter operation mode can be set by software.
Input jack
(label)
Function
(stacked/dual range)
Function
(single range)
A ADC 0 stacked ADC 0 left
B --- ADC 0 right
C ADC 1 stacked ADC 1 left
D --- ADC 1 right
Early versions:
Early versions have 4 input XLR jacks labelled 1/3, 2/4, 5 and 6. In the housing near the input jacks,
switches are provided to select between inputs 1 and 3 between inputs 2 and 4. In case, a 3rd AD
converter is provided, its inputs are statically connected to inputs labelled 5 and 6.
Input jack
(label)
Function
(stacked/dual range)
Function
(single range)
1/3 ADC 0 stacked ADC 0 or 1 left
2/4 ADC 1 stacked ADC 0 or 1 right
5 ADC 2 left ADC 2 left
6 ADC2 right ADC 2 right
1.2 Analog Outputs
The 8 analog outputs provide a dynamic range of 121 dB with a maximum output voltage of 18 dBu.
Their use is rather straight-forward. No extra configuration is necessary and no dependence on the
ADC configuration exists. The following table is valid for 2x1->4 routing with the left channel input
connected to Input A and the right channel input connected to Input C.
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Output jack Function
1 Sub left
2 Low left
3 Mid left
4 High left
5 Sub right
6 Low right
7 Mid left
8 High righ
1.3 Digital Inputs and Outputs
As digital in- and outputs, a balanced AES/EBU in-/output as well as an optical in-/output are provided.
These can be selected in the routing options of the remote software.
Only one 2-channel input at a time can be used, that is, either opto or XLR. The 2-channel output is
always available at the opto and XLR jacks.
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2 Front panel
On the front panel, LED bargraphs for input and output level as well as LEDs signalling several states
can be found. Below each bargraph, switches for selecting / muting the channel are provided.
Besides the output level meters, a gain reduction meter is provided for each of the 8 outputs. The red
LEDs provide information about the gain reduction induced by the peak limiter. That is, if the level
exceeds 0 dB, the peak limiter limits the signal to not exceed the allowed threshold.
Additionally, an RMS limiter, based on a thermal model of the speakers' voice coil reduces the gain
when the (modelled) temperature exceeds a threshold. The activity of the RMS or temperature limiter is
signalled by the letters TEM glowing red beneath the gain reduction LEDs.
With the buttons beneath the output LED bargraph labelled 1 to 8, the single channels can be muted. A
muted channel is signalled by the letters OFF glowing red.
The SEL LED flashes when the user enters the mode to set gain or delay for one of the input or output
channels. The LED display, then, shows the gain / delay for the channel with SEL flashing. The button
below each channel, then, operates as a select button instead of a mute button.
The input display section consists of 4 level meters and several status LEDs.
CLP: input signal clips
DRC: if lit, input operates in dual range (stacked) mode
ANA: analog input is active on this channel
DIG: digital input is active on this channel
LCK: digital input successfully locked onto the signal
SRC: sample rate converter is used
OFF: input has been muted by the user.
The HD2 can be configured via 8 buttons and a knob which provides an „Enter“ function when pushed
(see Fig. 1)
The front panel operations are not yet fully completed. Thus, the buttons MENU and PARAM are nonfunctional. With STORE and RECALL, menus can be entered which allow to store and recall setups
from a list. The PAGE keys navigate through the adjustable settings. After starting up, the HD2 is in the
Master Gain menu. From here, operation of PAGE brings up the menus as shown in the following→
picture:
5
Fig. 1: Buttons for front panel
operation
Parameters can be adjusted by turning the knob. Pushing the knob changes the step size between fine
and coarse. To store or recall setups, enter the menu by pushing RECALL or STORE, select the setup
and push enter.
With the help of the following figure of the internal processing in one of the two DSPs, the adjustable
parameters shall be explained briefly.
Master Gain
Function: Overall gain applied to every path.
Position: Behind the FIR filter block and PEQ bank.
Range: From -88.5 to 39.0 dB
Comments: The default maximum voltage for the AD converters is 28.5 dBu (26.6 Vpp) while the DAC
output voltage range is 18 dBu (7.94 Vpp). Thus, there is a “loss” of 10.5 dB inside the HD2. To obtain a
neutral behaviour with 0 dB gain, the master gain has to be set to 10.5 dB.
Note: From Firmware 1073 upwards, the master gain behaviour has changed. The range depends on
the selected configuration. For analog inputs, master gain ranges from -108.0 to +19.5 dB. A gain of 0
dB, then, provides neutral behaviour.
Master Delay
Function: Overall delay applied to every input
Position: After the PEQ-Bank in the input path
Range: Minimum: 0. Maximum depends on the delay used in the FIR filter and the outputs.
Comments: The delay uses a variant memory pool inside the DSP. That is, if e.g. a high master delay is
used, the maximum channel delay decreases and vice versa.
Input Gain
Function: Input specific gain. Influences input and all connected outputs
Position: After the PEQ-Bank in the input path
Range: -18 to +6 dB
Comments: In this menu, the input to be adjusted is shown on the display and indicated by a lit SEL
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LED at the corresponding input indicators. To change the input, push the button below the indicator.
Input Delay
Function: Input specific delay. Influences input and all connected outputs
Position: After the PEQ-Bank in the input path
Range: Minimum: 0. Maximum depends on the delay used in the FIR filter and the outputs.
Comments: In this menu, the input to be adjusted is shown on the display and indicated by a lit SEL
LED at the corresponding input indicators. To change the input, push the button below the indicator.
Channel Gain
Function: Output specific gain
Position: After the PEQ-Bank in the output path
Range: -12 to +6 dB
Comments: In this menu, the output to be adjusted is shown on the display and indicated by a lit SEL
LED at the corresponding output indicators. To change the output, push the button below the indicator.
Channel Delay
Function: Overall delay applied to every input
Position: After the PEQ-Bank in the input path
Range: Minimum: 0. Maximum depends on the delay used in the FIR filter and the outputs.
Comments: The delay uses a variant memory pool inside the DSP. That is, if e.g. a high master delay is
used, the maximum channel delay decreases and vice versa.
In this menu, the input to be adjusted is shown on the display and indicated by a lit SEL LED at the
corresponding input indicators. To change the input, push the button below the indicator.
Reset IP
Pushing the knob in this menu resets the IP to the default value 192.168.1.15. After restarting the HD2,
it uses this IP.
Comments: If the HD2 is connected to a DHCP router, this setting has no effect, since the IP assigned
by the router is used.
Additionally, a LED labelled ACT shows network activity in general, while REM signals network activity
for this very HD2.
Earlier versions:
Earlier versions differ from the description as follows:
1. OFF is called MUT
2. the levels are given relative to full scale.
3. DRC LED is not provided
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3 Basic Usage
The HD2 needs to be connected to its audio sources and sinks, of course. It works with different
programs for its DSPs according to the loudspeaker configuration (number of ways, mode of
equalization, downsampling rates, etc.) and with different FIR filters (if FIR equalization is selected).
The setups and filters can be uploaded from the PC or downloaded to the PC and stored on disk. The
DSP programs are uploaded automatically. The user can just forget about them.
A total number of up to 30 setups can be uploaded simultaneously. The maximum number of FIR filters
is limited to 50 by the program structure but may be lower in reality due to the internal memory size.
The setups contain the total state of the HD2, that is, the routing setup, selected programs and filters,
EQ settings etc. Also the FIR filters are stored in the setup. You can download the setup to the hard disk
and transfer it to another HD2. Since all necessary information is inside the setup, the user just has to
recall the setup in the second HD2 which will behave just like the source HD2.
3.1 Network Setup
To configure the HD2 externally via a remote PC, it contains a network chip with an own MAC address
which is unique for the HD2. Thus, the HD2 has to be integrated in a network via its Ethernet connector
which can happen in two different ways:
1. If the network is managed by a DHCP server, the HD2 will automatically obtain an own IP.
2. If only static IP addresses without any DHCP server are used, you have to establish a
connection between the remote PC and the HD2 either directly via an Ethernet patch cable or
by using a switch. Connect the HD2s and the PC to the switch. The HD2s then must have
different IP addresses which share the subnet with the PC's IP address.
The HD2 communicates with the remote PC via an own TCP/IP protocol. This requires the appropriate
network setup on the PC.
In case that a DHCP server is used in the network and the PC is already connected to the network, no
further actions are required.
If direct communication between PC and HD2 is desired, the both PC and HD2 have to be in the same
subnet. The default IP address of the HD2 is 192.168.1.15. Thus, open the network configuration on
your PC and modify the properties of the TCP/IP protocol such that the PC has an IP address in the
same subnet, e.g. 192.168.1.1.
If you are using more than one HD2s at a time, you have to assign different IP addresses. This is
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Fig. 2: TCP/IP configuration
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