Table of Contents
Advertisement
18. Analog Connections
18.1 Line Inputs
The HDSPe AIO Pro has an unbalanced stereo Line input via RCA connectors. The optional
analog XLR breakout cable turns the inputs into fully balanced ones.
The electronic input stage is built in a servo balanced design which handles unbalanced and
balanced signals correctly, automatically adjusting the level reference.
When using unbalanced cables or sources with TRS jacks: be sure to connect the 'ring'
!
contact of the TRS jack to ground. Otherwise noise may occur, caused by the unconnect-
ed negative input of the balanced input.
An important point when working with an AD-converter is to maintain the full dynamic range with-
in the best operating level. Therefore the HDSPe AIO Pro internally uses hi-quality electronic
switches, which allow for a perfect adaptation to the most often used studio levels +4 dBu, +13
dBu, +19 dBu and +24 dBu.
The 'standardized' studio levels do not result in a (often desired) full scale level, but take some
additional digital headroom into consideration. The amount of headroom is different in different
standards, and again differently implemented by different manufacturers. We tried to make the
level definitions of the HDSPe AIO PRO as compatible as possible. Additionally, to avoid confu-
sion, the name of the reference levels now equals the max level, 0 dBFS.
Input: XLR / RCA
Ref Level
Vrms
+24 dBu
12.28
+19 dBu
6.9
+13 dbu
3.46
+4 dBu
1.23
18.2 Line Outputs
The short circuit protected, low impedance line outputs are available as unbalanced outputs via
RCA breakout cable. The optional analog XLR breakout cable provides XLR connectors and
fully balanced operation.
The electronic driver circuit does not operate servo-balanced! When connecting unbal-
!
anced equipment, make sure pin 3 of the XLR output is not connected. A connection to
ground will cause higher THD (distortion)!
To maintain an optimal level for devices connected to the analog outputs, the HDSPe AIO Pro
internally uses hi-quality electronic switches, which allow for a perfect adaptation of all outputs to
the most often used studio levels.
As with the analog inputs, the analog output levels are defined to maintain a problem-free opera-
tion with most other devices.
XLR Out
Ref Level
Vrms
+24 dBu
12.28
+19 dBu
6.9
+13 dbu
3.46
+4 dBu
1.23
34
Former Name
-
Lo Gain
+4 dBu (with 9 dB headroom)
-10 dBV (with 12 dB headroom, equals +4.2 dBu)
RCA Out
Ref Level
Vrms
+19 dBu
6.9
+13 dbu
3.46
+4 dBu
1.23
-2 dBu
0.62
User's Guide HDSPe AIO Pro © RME
Hide quick links:
Advertisement
Table of Contents
