RME Audio Multiface User's Guide download pdf (Page 15)

User’s Guide HDSP System Multiface © RME

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 0 dBFS @ Headroom

Lo Gain +19 dBu 15 dB

+4 dBu +13 dBu 9 dB

-10 dBV +2 dBV 12 dB

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.

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RME Audio Multiface User's Guide Page 15