Both feature metal chassis and control knobs, the AudioBox iOne has separate XLR microphone input and 1/4-inch instrument jacks, while AudioBox iTwo offers two combo mic and switchable line/instrument inputs. Both feature high-performance class-A mic preamplifiers with phantom power, 24-bit/96 kHz converters and 105 dB of dynamic range. Both interfaces have a pair of balanced 1/4-inch, line-level outputs plus a separate headphone output jack with independent level control.

The AudioBox iTwo adds MIDI In/Out jacks and both interfaces have an internal analog mixer with zero-latency monitoring enabling you to monitor and freely mix previously recorded tracks while overdubbing and without hearable latency. The iOne has a Direct button that gives you a 50/50 mix of live input and your already recorded tracks.

Both interfaces work with any recording software that supports Core Audio (Mac) or ASIO (Windows). So I tried my AudioBox iTwo with Pro Tools HD 11.2.1 running on my Mac and found it to be superior in all ways to the other small interface I had been using. I like the detents on all the controls for a positive feel when making changes. I also like the ability to change either input over to a DI input for guitars or synths leaving the other as a standard XLR microphone input. The blue LEDs and matching blue anodized case are elegant-looking too!