Source Audio ZIO User Manual page 4

Output Side Connections
Main OUTPUT
This is the primary audio output. Connect it to your amplifier, recording interface, or the next device
in your effects signal chain using a unbalanced mono (TS) ¼" cable.
Headphone Output
The headphone output features a high dynamic range, low- noise amplifier that is capable of driving
low impedance studio headphones. This is a 1/8" (or 3.5mm) TRS output. Note: the Headphone
Output is only active when in use. Using the Headphone Output draws roughly 60mA of additional
current, so using a power supply rated under 200mA may cause the ZIO Bass to malfunction.
DIRECT OUT
DIRECT OUT is a Balanced XLR Output and can act either as an auxiliary audio output or an output for
connecting to a mixing console, PA, or audio interface. This output includes phantom power
protection.
All three outputs can be used individually OR simultaneously with one another, both when the pedal
is engaged and when it is bypassed.
Ground Lift Switch
If you are hearing any "hum" or loud buzzing while using the direct output, slide the LIFT switch to
the right to lift the internal ground connection to the DIRECT OUT XLR jack. This switch only applies
to the XLR Direct Output and will not have any effect on buzz or hum coming from either the
instrument or headphone outputs.
GAIN Trim Pot
The GAIN Trim Pot only applies to when the GRIT switch is set to the ON (up) position, and is pre-set
to add a moderate amount of distortion when GRIT is enabled (based on using a moderate output
passive bass). You can adjust this setting with a small Phillips head screwdriver to give the GRIT
circuit more or less drive, based on your instrument and preferences. Please note, setting this trim
pot only applies to the GRIT switch and not the ZIO Bass's overall gain level in your ecosystem.
SA272 ZIO Analog Bass Preamp + D.I. User Guide 4