Soundbarrier iUSB400, Instruction Manual, Page: 7 / 13

Connection
Front-Panel Connections and Controls
1) Microphone/Instrument Inputs: Both channels of the IUSB400 have Mic/Instrument combo jacks. This
convenient connector accepts either a ¼-inch phone plug or an XLR plug.
The XLR inputs on channels 1 and 2 are equipped with two microphone preamplifiers. These preamps
work great with all types of microphones including dynamic, ribbon, and condenser microphones.
Power User Tip: Dynamic microphones and ribbon microphones (which are a special type of dynamic mic) are generally
lower-output devices that, with few exceptions, require no external power source. Sending phantom power to a ribbon
mic that does not require it can cause severe damage to the mic – usually beyond repair. Condenser microphones are
generally more sensitive than dynamic and ribbon microphones and typically require ex48V phantom power.
Always review your microphone’s documentation and follow its recommended operating practices.
The ¼-inch TS connectors on channels 1 and 2 are for use with instruments (guitar, bass, etc.).
Power User Tip: Active instruments are those that have an internal preamp or a line-level output. Active instruments
should be plugged into a D.I. box, which should then be connected to the mic input rather than directly to an instrument
input. Plugging a line-level source into the instrument inputs on the front of the IUSB400 not only risks damage to
these inputs but can also result in a very loud and often distorted audio signal.