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Baseline perfect in 2011 Audio engineer nwavguy published a blog post titled “O2 headphone amp ” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design Our version of nwavguy's famous O2 amplifier the objective 2 desktop edition features updates based on feedback from the community It’s an ideal baseline Reference amplifier capable of powering everything from IEMs to HD 800S with linear ease Community-driven design the O2 was made for benchmark performance at an entry-level price something the audiophile world had never seen before But while nwavguy was satisfied with Purist input output and power arrangements The Drop community wanted more options Following the initial launch of the objective O2 the discussion lit up with more than 500 requests for changes to the input output and power configuration Members asked for a quarter-inch headphone output RCA inputs and a rear-mounted power jack and we were happy to oblige Thus the desktop edition was born Standard gain vs Medium gain we recommend the medium gain version If you plan to primarily use this amp with IEMs If you don't plan to use IEMs if your headphone has a 300-ohm or higher impedance or if your source is weak (less than 2V output) Opt for the standard gain version to ensure enough power