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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.
Effects Loop (for external effects devices)
As mentioned previously in the "Effects Blend Control" section of the manual, the Effects Blend circuit in your
350x is similar to that used on recording consoles, with the effects loop on a "side chain" to the normal
circuit. Unless the Effects Blend control is set to the full "wet" position, you will always get the full sound of
your instrument AND get the diversity an external effects unit offers. Use of the effects loop will reduce the
noise generated by external effects units (as compared to using the effect between your instrument and the
input jack, though many people use it in this fashion anyway). This is because the loop is after the preamp
gain stages.
The Effects Loop is compatible with most individual or multi-effect external effects devices. Many effects
devices on the market have input level adjustments. For instance, some units have a switch that you can set
for either -20 dB or +4 dB. In all cases, these should be set for 0 dB (if available) or +4 dB. The level going
to your effect is controlled by the Gain control on the front panel.
Note: The Effects Loop is used in conjunction with the Effects Blend control on the front panel. When the
Effects Blend Control is in the full counter-clockwise ("DRY") position, no effects will be heard. This is
normal.
Connecting An External Effects Device To The 350x Effects Loop
Obtain two high-quality shielded patch cables, preferably as short as possible. Route them in the most direct
way possible. (Running patch cables over the top of the 350x – as with any amplifier – can induce hum in the
cables and is not recommended.) Take one cable and connect it from the Effects Send jack on the 350x to
the input of your external effects device. Take the second cable and connect it from the output of your
external effects device to the Effects Return jack on your 350x. To set levels, follow the instructions as
previously listed in the "Effects Blend Control" heading under "Front Panel Features."
And, just so there isn't any confusion, the Effects Loop has nothing to do with the SubWave™ effect onboard
your 350x. It only is used in conjunction with an external effects device.
Effects Send
This jack's primary function is to send a post-EQ-and-SubWave™ signal to an external effects device for use
in the 350x Effects Loop. However, it can also be used as:
1. A line level output for use in conjunction with an additional (slave) power amp—such as SWR's Power
750.
2. An unbalanced output suitable for recording or live mixing board purposes.
The output impedance of the Effects Send jack is 100 Ohms.
10 • 350x OWNER'S MANUAL
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