Manual UC1 © Grimm Audio
17
blinking. Keep pressing the main dial while turning it to
change the monitor source. All inputs and outputs can
be selected. Their name is shown in the display and
their channels are highlighted in the meter. When
releasing the dial the indicated source stays selected.
Alternatively, release the dial when the blinking starts.
Then turn to select a source and press to confirm.
The large number in the display indicates the current
monitor gain level in dB’s. The monitor outputs offer 8
dB of clean gain above ‘0’ on the display. In other words:
a full scale signal will only reach full scale on a monitor
output if the monitor gain is set to +8 dB. This may
seem odd, but the idea is that the ‘0’ indication of the
display is your reference playback level to which you
always return after a louder of softer playback. This is
common practice in mastering. The ‘0’ level is usually
aligned with an SPL of 79dBC when playing a SMPTE
reference noise signal on a single channel. The Grimm
LS1 is factory aligned to that, you may adust the gain of
your 3rd party amplifier to achieve the same result - or
to select another acoustic SPL that suits you as
reference playback level. In case you feel the need to
adjust the ‘0’ level of the UC1, you can change it in menu
P2 (see chapter 6. Menus).
Note that the monitor gain can be set to display values
up to +18, which means that there is 10 dB of positive
gain available in the UC1 to audition very soft noises.
Note that any signal above -10 dBFS will in that case clip
– please use this extra gain with caution!
The volume control is in 0.5 dB steps above -17 dB and
1 dB below it. If you have a Grimm Audio LS1 or PMC
digitally controlled loudspeaker connected to the
proprietary cat 5 output on the back, the volume control
Main screen, Digital 1/2 selected, in phones mode
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