FOURAUDIO HD2, Руководство пользователя, Страница: 3 / 25

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 3
rd 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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