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8.6 Recording analog
For recordings via the analog inputs the corresponding record device has to be chosen (HDSP
Analog (x+x)). Apart from the internal jumpers which set the basic operating level, the Multiface
has no means to change the input level. This would make no sense for the digital inputs, but
also for the analog inputs one can do without it. It doesn't matter if the Multiface is operated at
a mixing desk or a multichannel Mic preamp, in either case the level can be controlled directly
at the source to match the Multiface's sensitivity perfectly.
The input sensitivity of the analog inputs can be changed through internal jumpers to meet the
most often used studio levels, see next chapter.
8.7 Analog Inputs
The Multiface provides 8 balanced Line inputs via 1/4" TRS (stereo) jacks. The electronic input
stage is built in a servo balanced design which handles monaural and stereo jacks correctly.
When used unbalanced it automatically corrects the gain by 6 dB.
When using unbalanced cables with stereo TRS jacks, the 'ring' contact of the cable's jack
should be connected to pin 1 (ground). Otherwise noise may occur, caused by the
unconnected negative input of the balanced input.
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 Multiface includes internal jumpers which
allow a perfect adaptation for all 8 channels seperately to the three most often used studio
levels.
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. Because of this we
decided to define the levels of the Multiface in a most compatible way.
Reference
Lo Gain
+4 dBu
-10 dBV
The device ships with +4 dBu as factory default. The according headroom meets the latest
EBU recommendations for Broadcast usage. At -10 dBV 12 to 15 dB headroom are common
practice, each mixing desk operating at -10 dBV is able to send and receive much higher
levels. Lo Gain allows to work with high levels, best suited for professional users who prefer to
work balanced and at highest levels.
Information on how to change the jumpers can be found in chapter 9.3.
0 dBFS @
+19 dBu
+13 dBu
+2 dBV
User's Guide HDSP System Multiface © RME
Headroom
15 dB
9 dB
12 dB
13
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