Analog Inputs / Outputs; Line In - RME Audio ADI-8 QS User Manual

11. Analog Inputs / Outputs

11.1 Line In

The ADI-8 QS rear has 8 balanced Line inputs, provided by 1/4"
TRS and a 25-pin D-sub connector. Both are internally connected,
so can not be used at the same time. The electronic input stage is
built in a servo balanced design which handles unbalanced (mono
jacks) and balanced (XLR, stereo jacks) signals correctly, auto-
matically adjusting the level reference.
When using unbalanced cables with XLR or TRS connectors be
sure to connect pin 3 (- or ring) to 1 (ground). Otherwise noise may
occur, caused by the unconnected negative input of the balanced
input.
The 25-pin D-sub connector follows the pinout known from devices
manufactured by Tascam (pinout see chapter 16.9). Your local
dealer will supply analog breakout multicores D-sub to XLR in Tas-
cam pinout in different lengths.
The ADI-8 QS uses a completely symmetrical signal path (including limiter) that guarantees an
exceptional sound quality, outstanding low distortion and highest Signal to Noise ratio in all level
settings.
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-8 QS internally uses hi-quality elec-
tronic switches, which introduce no additional noise or distortion to the audio path. The key
INPUT allows for a perfect adaptation of all 8 channels to the most often used studio levels.
Each analog input has its own 7-segment level meter, so every channel can be checked for
input signal and overloads easily. The level data incorporate the current Input Trim setting and
the digital limiter. The red LED OVR lights up 0.2 dB before full scale level (-0.2 dBFS).
The ADI-8 QS uses the following level references:
Reference
+24
+19
+13
+4.2
The setting +4.2 dBu equals -10 dBV with 12 to 15 dB headroom. Set to +24 dBu the ADI-8 QS
is compatible to SMPTE (+24 dBu @ 0 dBFS, +4 dBu with 20 dB of headroom).
28
0 dBFS @
+24 dBu
+19 dBu
+13 dBu
+4.2 dBu
User's Guide ADI-8 QS © RME
Headroom @ +4 dBu Other RME devices
20 dB
15 dB
9 dB
12 dB at -10 dBV
-
LoGain
+4 dBu
-10 dBV