Telos Zephyr Xstream User Manual page 205

13.1) the level would be 0 dBu (nominal). The system allows for 18 of headroom
above nominal level, clipping at +22 dBu.
Consumer:
This will be ‐11 dBu (nominal) for the factory default settings of JP10 & 11 (JP 5
& 6 on early rev audio boards). If these jumpers are reconfigured (see section
13.1) the level would be ‐15 dBu (nominal). The system allows for 18 headroom
above nominal level, clipping at + 7dBu.
Level Out: (Professional; Consumer)
This determines the nominal output level as follows:
Professional:
+4 dBu (nominal). Clip point is +22 dBu.
Consumer:
‐10 dBu (nominal). Clip point is +8 dBu.
Gain Trim: (-12dB to +12 dB)
This setting happens after the Analog‐to‐Digital converter. It will affect the levels of both the
Analog and AES/EBU inputs. It can be used to adjust for differing headroom requirements when
connected to other gear. Since this setting is in the digital domain changing to values greater
than the default (0 dB) will decrease operating headroom, by a corresponding amount.
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IMPORTANT TIP!
Setting the gain trim adjustment (below) to values greater than 0 dB will serve to reduce
input headroom by a corresponding amount.
The analog inputs clip point remains at +22 dBu(or +8, see above) so this level must not be
exceeded. The rare source device with a clip point in excess of +22 dBu may require an
external pad.
The Gain Trim setting may be use to adjust for differing peak output levels between different
"+4 nominal" source equipment, or it can be used to accommodate analog sources that are
below the nominal levels. We recommend that the source equipment's clip point be
determined and this be set using that information.
•
The default setting of 0dB accommodates input levels at nominal levels of
+4 dBu with a clip point of 22 dBu (e.g. 18 dB headroom). When feeding the
inputs from a "+4 nominal" device that clips at some lower level (for
example +18 dBu, e.g. 14 dB headroom), you can increase the gain (by 4 dB
in our example) to match this device's clip point to the Xstream's 0 dBfs
point.
USER'S MANUAL
Section 11: THE WORKS – Detailed Menu Reference 193