SWR 350x Operating Instructions Manual page 15

XLR Mode Switch (Line/Direct/Direct + Sub)
This three-position switch determines the signal present at the Balanced (XLR) Output jack as described in
the section directly above. In simple terms:
1. Direct = pre-EQ and SubWave™, post-first tube stage
2. Line = post-EQ and SubWave™
3. Direct + Sub = pre-EQ/post-first tube stage blended with SubWave™
Make sure the switch is set either to full left, full right or center to avoid an intermittent condition.
XLR Pad Control
This control sets the level present at the Balanced (XLR) Output. Turning the control counter-clockwise
reduces the overall level, while turning the control clockwise boosts the overall level. It should be noted
that turning the control fully counter-clockwise to "Min" does not fully defeat the signal. This is normal, as
the XLR Pad is designed to provide a range of usable levels to be sent to a front-of-house or studio mixing
console.
XLR Ground/Lift Switch
Sometimes connecting to certain mixing boards or studio consoles with non-standard XLR wiring can
cause a ground loop. Your 350x has a push-button switch for lifting the ground on the Balanced (XLR)
Output. (It affects no other outputs.) Pushing on the switch will change the mode of operation. When the
switch is in the "out" position (default setting from the factory), ground is on Pin 1 of the Balanced Output
jack as normal. When the switch is in the "in" position, the ground is lifted from Pin 1 of this output. If a
persistent hum exists after trying both positions of the ground lift, there is probably:
1. A bad cable or connection somewhere between your Balanced Output jack and the snake leading to
the mixing console;
2. A dirty or miswired A/C socket;
3. Mis-wired or poorly wired A/C in the building;
4. Fluorescent lighting directly above you or in close proximity (especially when using single-coil pickups)
5. A cell phone in your right pocket that's interacting with the electronics in your bass (don't laugh, this
actually happens!)
But, in the case of a true ground loop, this switch can often times solve the problem.
Tuner Out
The Tuner Out function allows the user to plug their instrument tuner into this jack and "tune up" without
having to unplug and go back and forth from amp to tuner. This feature is totally isolated from the rest of
the preamp and will function regardless of the settings on the front panel. Being isolated on a side chain
avoids loading down of the instrument, which can cause a loss in dynamic range.
To use this feature, connect a shielded patch cord from the Tuner Out jack on your 350x to the input jack
on your tuner. Turn the amplifier on and you're ready to go. If you do not wish to monitor your sound during
the tuning process, you may turn down the Master Volume.
350x • 15