Listen to your music with recording studio quality Portable USB DAC and headphone amp for Mac and PC Meet Apogee Groove Apogee Groove is the best portable USB DAC and headphone amp for listening to music on your Mac or PC. Groove takes the same high quality audio technology found in the world s most prestigious recording studios and delivers it to your laptop. Connect Groove directly to your computer and connect your headphones or powered speakers directly to Groove. It s that easy. You ll be amazed by the difference in sound quality. Recorded by Apogee. Played by Groove. For 30 years Apogee has been an innovator and industry leader in digital audio recording. From rock to classical, hip-hop to country, and reggae to jazz, the most successful artists and audio engineers rely on Apogee gear everyday to capture their best take. Now, for the first time, Apogee sound quality is available in a simple take-anywhere device dedicated to delivering the ultimate listening experience. Unlock the full potential of your high-res audio files, rediscover your iTunes library and stream Spotify, Pandora or your favorite music services with incredible clarity and detail. Groove s unique circuit design Constant Current Drive Groove s Constant Current Drive output stage is a truly revolutionary approach to dealing with the wide impedance variations of headphones available on the market today. With Constant Current Drive topology, Groove s output stage s voltage is dynamically molded to the impedance variations of the connected headphones, thereby smoothing out frequency response non-linearity that occurs with traditional headphone outputs. Quad Sum DAC Groove also features a Quad Sum DAC design which employs four digital-to-analog converters per channel to achieve the highest dynamic range and lowest distortion (THD N) of any device in its class. Highlights USB 2.0 connection to Mac and PC Up to 24 bit / 192kHz audio ESS Sabre DAC Constant Current Drive , Ultra-smooth frequency response for any headphones Quad Sum DAC , 4 DACs per channel for highest dynamic range and lowest distortion Asynchronous clocking Max output level: 225mW into 30 Ohm Multi-color LEDs for status and level indication Powered by USB Top panel buttons for adjusting output level and muting Compact and portable (95mm H x 30mm W x 16mm T) Premium aluminum build quality Built in the USA