From: Drop (formerly Massdrop) - Monday Jan 13, 2020 09:27 pm
  In 2011, audio engineer and blogger NwAvGuy published a post titled “O2 Headphone Amp.” In the blog, he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. This is the Objective 2, NwAvGuy's most famous headphone amplifier. Capable of powering everything from IEMs to HD 800s with linear ease, the O2 is your ideal baseline reference amplifier. This Desktop Edition features a quarter-inch headphone output, RCA inputs, and a rear-mounted power jack.  
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