Source Audio ZIO Manual

The Bass ZIO is an ultra-low noise all-analog preamp and DI for bass. It uses high voltage internal
rails (+/-12V) for maximum headroom from a 9V supply input. The Bass ZIO features a simple but
flexible set of tone shaping controls and an additional GRIT control for added tonal color. The
Bass ZIO can be used directly with headphones for practice and monitoring or as a direct input
using the balanced XLR output for connection to a mixer or audio interface.
CONTROLS
OUTPUT – Clean signal
gain control from -6dB
to +16dB.
GRIT – Enables a mild
distortion to mimic
the transformer-style
breakup from high-
end bass amps. Note
the gain can be
adjusted for more or
less distortion. The
"up" position is on.
FOOTSWITCH – The
Bass ZIO is not a true
bypass pedal by
design. When bypassed,
the tone controls and
output gain are disabled
but the three outputs:
Main Output,
Headphones, and Direct
Out remain active.
GAIN (side adjustment) – this "trimmer" control can be adjusted with a small screwdriver from
the unit side. We have preset the trimmer for a moderate amount of gain with an average
output passive bass. If you're using the Bass ZIO with a high output active bass or a lower output
passive bass, you can adjust the gain up or down to taste with this control.
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BASS – Bass shelving filter centered
at 100Hz ranges from flat in the min
position to +11dB of gain at the max.
TREBLE – Treble shelving
filter centered at 1kHz
ranging from -6dB at the
min position to +14dB at the
max. Note that "flat" is at
center of the knob range.
FOCUS – A high pass filter
for reducing the lowest
bass frequencies. Use this
knob in conjunction with
the BASS control to
"focus" the peak of the
bass shelving filter.
SCOOP – This control
provides a special mid cut
to clean up "muddy" mid-
range frequencies. The cut
profile is based on the
classic 'Pultec Trick' from
the Pultec® equalizer. Set
the toggle "up" to enable.