LH Labs GeekOut V2 USB Headphone Amplifier & DAC Black Geek Out V2 is the most transparent USB DAC you can find, supporting PCM up to 32/384 kHz and 1-bit DSD up to DSD128. Geek Out V2 fully complies with the USB 2.0 Audio Specification. That means it's plug-and-play on USB 2.0 devices. We provide a driver for non-compliant operating systems Not all headphones are created equal, so Geek Out V2 lets you choose how much power to output: 100 mW for sensitive IEM's or 1000 mW for large cans Fully balanced circuit topology allows for use with single ended or balanced headphones. To take advantage of balanced operation you'll need a balanced cable for your headphones that terminates in an 1/8" TRRS jack Geek Out V2 lets you choose between Time Coherence Mode (minimum phase) or Frequency Response Mode (slow roll-off linear). It's the only portable DAC that gives you this much control