O2 is an opensource amplifier designed by brilliant engineer NwAvGuy, with emphasis on benchmark performance and low cost. O2 arrives fully assembled, hand tested, and ready to enjoy.
Our Objective2's are assembled 100% in accordance with NwAvGuy's default, high-performance specifications.
Objective2 achieves vanishingly low THD and noise performance for audible perfection.
O2's extremely low output impedance ensures transparent frequency response for all headphone loads.
At over 600mW, Objective2 provides enough output power to drive all dynamic headphones on the market with authority.
O2 requires an AC adapter to charge its batteries.. Power adapters are sold separately, as we ship worldwide. Be sure to select one of the following:
Default gain levels of Objective2 are intended to work well with over 95% of headphones on the market. We use the stock O2 with headphones as low as 16 ohms @ 1 dB/mW, and as high as 600 ohms (very high and very low efficiency, respectively). There is no reason to alter stock gain unless you regularly listen at extremely low volumes. We can set custom gain of 1.0/2.5x upon request, or you can easily perform this change by removing two resistors.