User’s Guide OctaMic XTC
© RME
23
9.3 AutoSet
Some preamps include limiters in order to prevent clipping, especially of the A/D converter
stage. Such a circuitry is not feasible for the OctaMic XTC, because it would spoil the mic pre-
amp's excellent technical data.
But as the OctaMic XTC's gain is controlled completely digitally, the device can set it automati-
cally, thus providing perfect protection from overload with no degradation of the audio signal,
which does not have to pass any additional electronic circuits.
Since AutoSet operates as overload protection and not as 'compressor', there is no automatic
gain increase. AutoSet only reduces gain. And with AutoSet activated, the gain can still be
changed manually. The currently highest possible value can not be exceeded, because AutoSet
will reduce the gain in real-time during the manual change.
In practice, there are two possible ways to work with AutoSet:
•
Gain of all channels is set to a rather high value, e.g. 60 dB. Then a rehearsal with maximum
acoustic level is performed. Thereafter AutoSet is switched off.
•
As above, with AutoSet permanently active.
There are good reasons for both of these alternatives. Thanks to the flexible threshold setting
and easy manual correction of set values, the OctaMic XTC is fit for all applications.
AutoSet can be activated in CHANNEL as well as on the gain pages brought up by the chan-
nel’s SELECT key: a push on encoder 1 and 2 activates AutoSet. The label AS in the display
changes from light gray to black.
With grouped channels the field
AutoSet Gain
is grayed out, activating AutoSet is then done in
the Groups page.
To avoid shifts in panorama AutoSet should work ganged with stereo channels, so that gain
changes of one channel are also applied to the other one. This function is part of the groups
and thus available for up to 8 channels simultaneously. This also means that for using ganged
AutoSet a stereo pair (like Mic1/2) has to be defined and activated as group.
As soon as AutoSet reduces the gain the label AS, shown in the front display, changes its color
from black to blue.
9.4 Instrument
The 1/4" TS instrument input of channels 5 to 8 allow to attach both line signals as well as in-
strument signals. It handles standard line sources like keyboards, mixing desks, effects devices
or consumer-type units perfectly well. With its input impedance of 800 kOhm it also serves
perfectly as instrument input. The maximum input level is +21 dBu unbalanced. PAD is not
available.
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