RME Audio ADI-2 FS, Руководство пользователя

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6
User's Guide
ADI-2 FS © RME
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6. Inputs and Outputs
6.1 Line In XLR / TRS
The ADI-2 FS has two analog line inputs that can operate with levels up to +19 dBu. The elec-
tronic input stage uses a servo balanced design which handles unbalanced (TS jacks) and bal-
anced signals (TRS / XLR) correctly, automatically adjusting the level reference.
When using unbalanced cables with the XLR inputs, pin 3 of the XLR jack should be con-
nected to ground. Otherwise noise may occur, caused by the unconnected negative input of
the balanced input.
To use the inputs as unbalanced RCA: simply insert a standard TS male to RCA female
adapter. Now any RCA / Cinch cable can be easily used with the ADI-2 FS.
One of the main issues when working with an AD-converter is to maintain the full dynamic
range within the best operating level. Therefore the ADI-2 Pro internally uses hi-quality elec-
tronic switches, which allow for a perfect adaptation to the four most often used 4 dBu,
+13 dBu and +19 dBu.
Level Meter
The 2-channel level meter with 6 LEDs each offers a useful display and check of input level and
overloads. The LEDs make use of different brightness for different levels, so levels in between
are easy to read out. This technology allows the ADI-2 FS to visualize a range of –80 dBFS up
to –3 dBFS using only 5 LEDs.
The red OVR LED lights up dimmed at -2 dBFS, more bright at –1 dBFS. Reaching 0 dBFS it is
fully lit. A peak hold function of one second ensures better visualization whenever the highest
level is reached.
The table shows the level definition of
the Level Meter, based on 0 dBFS. The
actual input level in dBu can be calcu-
lated by adding the offset caused by the
current choice of Input Level. Set to +19
dBu add 19 dB, at +4 dBu a value of 4
dB has to be added.
6.2 Line Out XLR
The ADI-2 FS has two balanced, short circuit protected, low impedance line outputs, available
as XLR jacks on the rear of the unit.
The XLR line outputs do not operate servo balanced! When connecting unbalanced equip-
ment, make sure pin 3 of the XLR output is not connected. A connection to ground might
cause a decreased THD (higher distortion) and increased power consumption!
To maintain an optimum level for devices connected to the analog outputs and to maximize the
signal to noise ratio, the ADI-2 FS internally uses hi-quality electronic switches, which allow for
a hardware-based adaptation to the maximum levels +4 dBu, +13 dBu and +19 dBu. For a
variable control via the VOL pot see chapter 6.4.
LED Dim Medium Bright
OVR -2 -1 0
-3 dB -5 -4 -3
-6 dB -8 x -6
-12 dB -24 -18 -12
-30 dB -45 x -30
-60 dB -80 x -60