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Note: If you want to overdrive the first TUBE stage, use an external preamp between your
instrument and the Passive input. To obtain optimum sound when trying this, make sure the
preamp clip LED is not activated. If this occurs, turn down your Gain control until the LED
does not light. The first preamp tube stage is NOT monitored by the preamp clip circuit for
this reason.
ACTIVE INPUT
The Active input jack should be used with instruments having a built-in (on board) preamp or other
sound sources that will produce output levels greater than 1 volt RMS. Some of these basses
are the Kubicki X-Factor and some older Ovation electrics. Some really “hot” pickups installed in
your instrument may sound better through the Active input. The best judge is your own ears.
If you’re using a keyboard or bass pedal with the Bass 350, we have found the best choice to be
the Active input.
Note: Using the Active input with passive basses (active instruments will always employ a
battery) may result in a loss of high end transients. Players who roll off their high end start-
ing at about 2kHz, or prefer a “darker” sound, may find this input more to their liking.
If you hear some distortion with your active bass and are using the Active Input, make sure the
preamp clip LED indicator is not lighting. If the preamp stage is not being driven into clipping,
replace the battery in your instrument.
GAIN CONTROL
The Gain control adjusts the volume of the preamp section. Since the Gain control is similar to a
“pad,” a small amount of signal will be heard even with the Gain control rotated fully counter-
clockwise (with the Master Volume up).
After all EQ settings and the Aural Enhancer are set, the Gain control should be raised until the
preamp clip LED barely flashes when your loudest note is struck. This will insure maximum signal
to noise ratio and prevent unwanted clipping of the preamp section.
Note: The Gain can serve as an EFFECTS SEND LEVEL ADJUSTMENT. If your effect is being
overdriven, turn down the Gain control and re-adjust your Master volume for overall loudness.
PREAMP CLIP LED
The preamp clip LED will light whenever the preamp, tone section or output buffer reach clipping
(run out of headroom). This function does NOT monitor the first tube stage of the Passive input.
See that section for more info.
In the event the clip indicator lights, turn down the Gain control. Since this circuit monitors the
tone controls, boosting any one of them can cause the clip LED to activate. Once again, you may
leave the tone control at its desired level, but turn the Gain control down further.
AURAL ENHANCER
The Aural Enhancer was developed to bring out the fundamental low notes of the bass guitar, reduce
certain frequencies that help “mask” the fundamentals, and enhance high end transients. This effect
becomes more pronounced as the control is turned to maximum. The result is a more transparent
sound and is especially noticeable with a slap style of playing. A particularly favorite setting for live
gigs is at about 2 o’clock. This position of the Enhancer brings out both the low end fundamentals
and crisp highs and, at the same time, adds a little lower midrange to help cut through the band.
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BASS 350 USER GUIDE