Universal Audio Volt 2 Interface Review by Reid Stefan. Compare the Volt2 to the Scarlett 2i2 to determine the best Audio Interface under $200. Reid compares the mic preamp quality, speaker output, headphone quality, features, and price of the Volt 2 and Focusrite Scarlett 2i2. Karra records a vocal with the Universal Audio SD-1 Dynamic Microphone for a direct shootout in Ableton.