8
EURORACK UB1222FX-PRO
2.2 Stereo channels
2.2.1 Channel inputs
Fig. 2.5: Stereo channel inputs
Each stereo channel features two line-level inputs on 1/4"
connectors for left and right channels. Channels 9/10 and 11/12
can also be used in mono if you only use the connector labeled
L.
Both channels 5/6 and 7/8 feature an additional balanced XLR
input for microphones with available +48 V phantom power.
All stereo channel strips have a TRIM control for level setting.
In those channels in which a mic input is present in the channel,
the TRIM control has two scales: just like in the mono channels,
there is a 0 to +40 dB scale that shows the preamplification of
the mic signal; the +20 to -20 dB scale shows the sensitivity for
the corresponding input level that is applied to the line input.
Both inputs can also be used with balanced or unbalanced
connectors.
2.2.2 Equalizer stereo channels
The equalizer of the stereo channels is, of course, stereo. The
filter characteristics and crossover frequencies are the same
as those of the mono channels. A stereo equalizer is always
preferable to two mono equalizers if frequency correction of a
stereo signal is needed. There is often a discrepancy between
the settings of the left and the right channels when using separate
equalizers.
2.2.3 Aux sends stereo channels
In principle, the aux sends of the stereo channels function in
just the same way as those of the mono channels. As aux send
paths are always mono, the signal on a stereo channel is first
summed to mono before it reaches the aux bus.
2.2.4 Balance, mute switch and channel fader
BAL
The function of the BAL(ANCE) control corresponds to the
PAN control in the mono channels.
The balance control determines the relative proportion between
the left and right input signals before both signals are routed to
the main stereo mix bus.
The MUTE switch, MUTE LED, CLIP LED and channel fader
function in the same way as the mono channels.
2.3 Connector panel and main section
Whereas it was useful to trace the signal flow from top to
bottom in order to gain an understanding of the channel strips,
we now look at the mixing console from left to right. The signals
are, so to speak, collected from one point on each of the channel
strips and then routed to the main section all together.
2.3.1 Monitor send and FX send channels
Fig. 2.6: Aux send controls of the main section
A channel signal is routed to the MON(ITOR) send bus if the
MON control is turned up on the corresponding channel.
MON SEND
The aux send control MON SEND acts as master control for
the monitor bus and determines the level of the summed signal
that is taken from the mixer via the MON SEND connector and
that can for example be fed to an amplifier for monitor purposes.
Using the audio signal from this output, you can also feed a
subwoofer if you dont require stage monitors. To this end, you
should implement a crossover in your signal path pre-subwoofer
and pre-amplifier, so that only low frequencies are fed into the
subwoofer. You can achieve the same effect by using the built-
in graphical equalizer. Lower all frequencies above 160 Hz and
assign the equalizer to Monitor.
+When you use the MAIN MIX fader to reduce the
overall volume, keep in mind that the subwoofer is
still receiving a signal!
FX TO MON
You can use this control to insert an effects signal from the
built-in effects processor to your monitor mix. Of course, to do
this, your effects processor must first receive a signal, i.e. the
FX controls in the channel strips must be turned up, and the FX
SEND fader (see fig. 2.6) hast to be open.
MON MUTE
If the MON MUTE switch is pressed, the monitor bus is muted,
i.e. there is no signal at the MON SEND connector.
FX SEND
The FX SEND fader determines the overall level of the effects
bus. Both external effects processors (via the FX SEND
connector) and the built-in processor only receive an input signal
if this control is open.
FX TO MAIN
Use the FX TO MAIN control to feed the effects signal into the
main mix. If the control is turned all the way to the left, no effects
signal can be heard.
FX MUTE
If the FX MUTE switch is pressed, the effects channel is
muted, i.e. no signal is present at the FX SEND connector and the
effects processor no longer receives an input signal.
2. CONTROL ELEMENTS AND CONNECTORS