Unbalanced Guitar Outputs; A+B Mixing (Channel-1) - Radial Engineering SW4 Owner's Manual

True to the Music
THE UNBALANCED GUITAR OUTPUTS
The mix bus is equipped with left and right ¼" high-Z guitar jacks located next to the XLR outputs. These are primarily used to feed stage amplifi ers
when the SW4 is used for wireless guitars and basses. The outputs are transformer isolated to eliminate noise that often gets added when connecting
to high-Z guitar amps and buffered to enable long cable runs up to 15 meters (50') without appreciable noise or signal loss. This lets you position the
SW4 backstage in the guitar tech's area and send long ¼" cables to the on-stage guitar amps.
The top ¼" jack is labelled MONO/LEFT while the bottom is labelled RIGHT. The RIGHT output is equipped with a switching jack that if left disconnected
sums the stereo bus and routes a mono signal to the ¼" LEFT output jack. This lets you use the ¼" outputs in either stereo or mono without effecting
the XLR bus outputs. A top-mounted 'set & forget' level control lets you to adjust the signal level going to the stage amps so that it sounds right to the
musician. Start by testing the guitar signal using a straight cable connection from the instrument to the amp, then compare when using the wireless
system and the SW4 and adjust the trim controls to suit.
EXAMPLE
The following diagram is a complex SW4 system that allows a single guitar tech to look after three guitars and a bass in a band. The tech can tune
the standby instruments and monitor live instruments with the PFL system. Channel-1 is used for an acoustic guitar. The output of this channel is sent
directly to the PA system and is not assigned to the mix bus. Channel-2 is used for bass and is also not assigned to the mix bus. The output connects
to a Radial JDI direct box that splits the signal sending it to the bass amp and the FOH/Monitor consoles. Channels-3 and 4 are used for the rhythm
and lead guitars. Both of these channels are assigned to the mix bus and output at the high-Z ¼" jacks. The mix bus is set to operate in stereo so that
the lead guitar is output on the right jack and the rhythm guitar on the left jack where the guitar amplifi ers connect.
Bass Guitar ar
Lead Guitar Rhythm Guitar tar Acoustic Guitar
PFL Speaker Tuner Headphones
Guitar Tech
Bass DI
Bass Amp PA Mixing Console
Rhythm Amp Lead Amp
MIXING INPUTS ON CHANNEL-1
In some situations you may want to have more than one input on at the same time. This,
for example, could be to have two guitars active such as an acoustic on a stand and an
electric at the ready, swung around the back, for an instant changeover. Another application
could be for two wireless microphones used by a single vocalist who must switch mics
backstage during a particular performance because of costume or set changes.
To address this, channel-1 is equipped with a recessed A+B 'mix' switch that turns on both
inputs. When the A+B function is engaged a resistive mixer is employed to sum the A and B
inputs together. Use the trim controls to balance the signals as needed. Because the A+B
A+B Mix Switch On Channel-1
function is passive, you will notice a slight reduction in level. This is easily compensated for
at your mixer. Set the A+B switch to the inward position to turn both channel-1 inputs on.
Set the A+B switch to the outward position to use the channel-1 A/B switching normally.
Radial Engineering Ltd. SW4 User Guide
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