This four-channel USB device for Mac and PC-based systems enables users to record and monitor up to eight channels of audio in 16-bit mode or four channels in 24-bit mode. The iO4 has four input channels, each having an XLR microphone input, a 1/4" TRS insert for external effects units and a 1/4" TS jack that works with line-level sources and can accommodate direct connection of guitars. The iO4 features discrete-design preamplifiers and 48V phantom power on each of its four input channels as well for use with virtually all microphones and audio sources.
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