SA272 ZIO Analog Bass Preamp + D.I. User Guide
• Center negative, Barrel positive plug, 2.1 mm inner diameter, 5.5 mm outer diameter
Audio Performance
• Input Impedance: 1 Mega Ohm (1 MΩ)
• Main Output Impedance: 75 Ohm (75 Ω)
• XLR Output Impedance: 75 Ohm (75 Ω)
• Headphone Output Impedance: 42 Ohm (42 Ω)
• Maximum input headroom: +/-10V
• Active Analog Buffered Bypass
Troubleshooting
Noise/Hum
Power source: Ensure that the proper power supply is being used.
Near noise source: Move pedal away from power supplies and other equipment.
Other equipment: Remove other effects from signal chain; see if noise persists.
Bad cables: Swap out audio cables.
Ground loop with amp: Make sure your ZIO Bass is running on the same power mains circuit as your
guitar amplifier.
While using DIRECT OUT: Try flipping the Ground Lift switch to the right if you are experiencing
excess noise while using the DIRECT OUT XLR connection.
Unit Appears Dead / No LEDs Lit
Wrong power supply: Use correct power supply. See the DC 9V (Power) section for more details.
Frequently Asked Questions
What kind of instruments can I connect to the ZIO Bass’s inputs?
ZIO Bass is specialized for bass players, but can work with guitars, synths, and any number of
alternate electric instruments. ZIO Bass is designed to work with any number of different types of
basses, including both active and passive basses, as well as synthesizers, since the input headroom is
relatively high.
Does ZIO Bass feature phantom power protection?
Yes, the ZIO Bass uses Zener diodes for protection from phantom power.
Can I use the ZIO Bass in my amp’s effects loop?
The ZIO Bass audio inputs can handle up to 8.76 dBu or 6.0 Volts peak-to-peak, which allows it to
work in most amp effects loops. Be sure to check your amp’s documentation to verify that the
maximum send level is less than the ZIO Bass’s maximum input level.
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