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24. Analog Connections<br />
24.1 Line Inputs<br />
The H<strong>DSP</strong> <strong>9632</strong> has an unbalanced stereo Line input via RCA connectors. The optional analog<br />
XLR breakout cable turns the inputs into fully balanced ones.<br />
The electronic input stage is built in a servo balanced design which handles unbalanced and<br />
balanced signals correctly, automatically adjusting the level reference.<br />
44<br />
When using unbalanced cables with the XLR breakout cable: be sure to connect the 'ring'<br />
contact of a stereo TRS jack, and pin 3 of a XLR jack, to ground. Otherwise noise may occur,<br />
caused by the unconnected negative input of the balanced input.<br />
One of the main issues when working with an AD-converter is to maintain the full dynamic<br />
range within the best operating level. Therefore the H<strong>DSP</strong> <strong>9632</strong> internally uses hi-quality electronic<br />
switches, which allow for a perfect adaptation of all inputs to the three most often used<br />
studio levels.<br />
The 'standardized' studio levels do not result in a (often desired) full scale level, but take some<br />
additional digital headroom into consideration. The amount of headroom is different in different<br />
standards, and again differently implemented by different manufacturers. Because of this we<br />
decided to define the levels of the H<strong>DSP</strong> <strong>9632</strong> in the most compatible way.<br />
Reference 0 dBFS @ Headroom<br />
Lo Gain +19 dBu 15 dB<br />
+4 dBu +13 dBu 9 dB<br />
-10 dBV +2 dBV 12 dB<br />
With +4 dBu selected, the according headroom meets the latest EBU recommendations for<br />
Broadcast usage. At -10 dBV a headroom of 12 dB is common practice, each mixing desk operating<br />
at -10 dBV is able to send and receive much higher levels. Lo Gain is best suited for<br />
professional users who prefer to work balanced and at highest levels. Lo Gain provides 15 dB<br />
headroom at +4 dBu nominal level.<br />
The above levels are also found in our ADI-8 series of AD/DA converters, the Multiface, and<br />
even in our Mic-Preamps QuadMic and OctaMic. Therefore all <strong>RME</strong> devices are fully compatible<br />
to each other.<br />
User's Guide H<strong>DSP</strong> <strong>System</strong> H<strong>DSP</strong> <strong>9632</strong> © <strong>RME</strong>
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