Focusrite's second-generation Scarlett 2i4 is a portable audio interface designed specifically for use in a computer environment. Lightweight at 1.9 lb, the device sports two balanced outputs, two Scarlett combination inputs, instrument/line switches, 48V Phantom power, direct monitoring, and the ability to draw power via USB. You can also monitor—or send cue mixes out to instrumentalists—by means of four unbalanced RCA jacks mounted on the rear panel.