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The Objective2 (O2) is an open source amplifier designed by NwAvGuy, focusing on benchmark performance and low cost. The end product is a solid, uncolored amplifier that boasts some of the best measured performance in it's category. It's performance rivals models that are several times more expensive and can drive any headphone on the market regardless of impedance or sensitivity. This model includes a new black aluminium case, brushed aluminium front and rear panels and a rubber volume knob. Includes a 120v US type plug power supply and rear power modification. Each unit is hand made and individually tested before shipping to guarantee full working condition. If you have any problems with the amplifier please contact us to troubleshoot. Please note: The power supply is rated for 110-120 volt electricity, will not work in countries with 220-240 mains without a step down voltage adapter.