Radial Engineering SW4 Owner's Manual - page 3
True to the Music
Radial Engineering Ltd.
SW4 Owner’s Manual
SW4 OVERVIEW
Housed in a single space 19” rack enclosure, the Radial SW4 is a balanced analog audio switcher with four channels, each of which is equipped
with A and B XLR inputs and a dedicated XLR output. The four individual channels are essentially straight wire connections. There are no buffers
or amplifi ers in the signal path that could distort or introduce artifact.
The signal fl ow for each channel is diagramed below. After the A and B inputs, a set of trim controls allow you to fi ne tune input levels. Switching
the A/B inputs can be done via the front panel A/B selector or using the optional JR•2 remote. Each channel may be used independently or
channels may be linked together for stereo, three-channel or four-channel switching.
BALANCED
INPUT-A
BALANCED
INPUT-B
TRIM
LEVEL
A
TRIM
LEVEL
B
MIX
BUS
ON/OFF
A/B
SELECT
SWITCH
JR•2 REMOTE
A/B SWITCH
LINK
SWITCH
GROUND
LIFT
MUTE
ON/OFF
ISOLATION
TRANSFORMER
CHANNEL
OUTPUT
STEREO
OUTPUT
To next channel A/B switch
To eliminate hum and buzz caused by ground loops, each channel output is transformer isolated and equipped with a ground lift switch. These
are rated to handle signal levels in excess of +20dB from 20Hz to 20kHz and work equally well when switching the outputs from professional
mixing consoles as they do for wireless microphones and instrument level signals.
The output from each channel may be independently routed to the stereo mix bus. This equipped with balanced XLR and ¼” outputs. The mix
bus allows you to create a stereo mix from any of the four channels. Channels-1 and 3 are routed to the left output while 2 and 4 are routed to
the right output. A top-mounted mono-sum switch may be engaged to route all four channels to both outputs.
System monitoring is fully supported with signal present LEDs on each input and a PFL (Pre-Fader Listen) system. The PFL system enables the
audio engineer to listen to the primary input-A or secondary input-B sources before switching using headphones or a powered monitor speaker.
There are many applications where the SW4 can be used. Examples include: switching backup wireless microphones or guitars on a busy
stage; switching multi-channel backing tracks from a DAW workstation for a live musical performance; switching FOH mixing consoles at a music
festival. Several of these are detailed later in the manual.
1
Left
Center
Right
Front Fills
A
A
A
A
B
B
B
B
FOH
Mixer-1
FOH
Mixer-2
Mixing Console
A
A
A
A
B
B
B
B
Primary
Primary
Wireless Mics
DAW Workstation
Backup
Backup
R
R
F
F
C
C
L
L