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350x • REAR PANEL FEATURES
Balanced (XLR) Output
The Balanced XLR out is a true electronically balanced output, suitable for studio and "front-of-house"
(live) mixing consoles. The level present at this output can be adjusted by using the XLR Pad control (see
the "XLR Pad Control" section below for more details). The signal appearing at the Balanced Output is gov-
erned by the setting of the three-position XLR Mode switch located directly below it (Line/Direct/Direct +
Sub).
In the DIRECT position, the Balanced Output signal comes from directly after the first stage of the special-
ly-selected 12AX7 preamp tube, giving you the sound of your instrument and some added warmth. In other
words, it becomes an active TUBE direct box. In this position, no front panel controls are functional and
the SubWave™ is not present.
In the LINE position, all front panel controls – including the Aural Enhancer, SubWave™, and EQ controls –
are functional except the Master control, and the signal is essentially the same as that heard through your
speaker system. If you are using an external effects device in the effects loop, that signal will also be pre-
sent when in the LINE position (dictated by the setting of the Effects Blend control on your 350x). When in
this position, the output level will be affected by the Gain control on the front panel as well as the XLR
Pad control. It's worth noting that changing the level of the Gain control will affect the signal present at
your speakers, the Effects Send jack, and the Balanced Output, while the XLR Pad control affects the level
present at the Balanced Output only. For this reason, it's usually better to set your Gain control in accor-
dance with the directions in the "Gain Control" previously listed in the "Front Panel Features" section of
this manual, and to use the XLR Pad control to set the level specifically for the Balanced Output.
The third position for this switch is the DIRECT + SUB position. In this position, the signal present at the
Balanced Output jack is the same as when in the DIRECT position, with one important exception: the
SubWave™ is present. What's the benefit of this setting?
We've found that most people who use effects pedals prefer to use them in front of the amplifier. In other
words, they run their bass into the effect pedal's input, then from the effect pedal's output into the front
of their amplifier. In live applications where sound reinforcement is required, often times the front-of-house
engineer will take a direct signal from the bass itself (via either a direct box, or the Balanced Output of
your amp set to the DIRECT position) and use that signal as the main bass sound to the house P.A. This
way, if the bassist sets the amplifier's EQ controls in a way to his liking, but in a manner not conducive to
a good bass sound for the house P.A., the front-of-house mixing engineer still has a nice, flat bass signal
to work with, and then he can EQ the bass sound for what's best in the room. And, more relevantly, he
would still get the sound of any effects pedal that was placed in front of the amplifier.
The DIRECT + SUB position provides this exact function for the Balanced Output. It always contains the
sound of your bass signal just after the first tube stage, and will also contain the SubWave™ effect when
engaged without also sending EQ settings that may not be right for the house P.A. (or a studio mixing con-
sole). You can always include all of your EQ settings (plus the SubWave) at the Balanced Output by setting
the three-position switch to the LINE position. But thanks to the DIRECT + SUB position of this switch, it's
not a necessity that you do so just because you want the SubWave™ present at the Balanced Output.
Note: You can still use the SubWave™ Level control to set the amount of sub-octave effect present at
the Balanced Output when in the DIRECT + SUB mode; however, it will also affect the level present at
the speaker outputs as well. Also, though the Gain control will not affect the level of the "clean" bass
signal present at the Balanced Output when in DIRECT + SUB mode, it WILL affect the level of sub-
octave present. This is normal, and occurs because the SubWave™ circuit is located after the first
stage of the preamp tube and is blended back into the signal specifically for this special mode of the
three-position switch. We recommend that you set the Gain and SubWave™ Level controls in accor-
dance with previously mentioned instructions, and the gain structure should fall into place fairly auto-
matically.
Wiring for the XLR jack at the Balanced Output is as follows:
Pin 1 = ground, Pin 2 = + (plus), Pin 3 = – (minus)
(American Standard)
Note: Turn off transients appear at the Balanced Output when the amplifier is shut down. We recom-
mend that equipment being used in conjunction with the Balanced Output be turned down, off, or dis-
connected BEFORE the 350x is turned off.
14 • 350x
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