The Bellari HA543 headphone amplifier designed to have the highest level of sound quality. At every design stage we spent a considerable amount of time focused on one thing, sound quality. XLR balanced inputs 1/4” and 1/8” headphone outputs pass thru (RCA Out) that also works when using the XLR inputs mute switch power switch enhance feature the Bellari HA543 is a truly remarkable headphone amp. It will bring your set up to the next level, and get you fully addicted to This hobby. While the HA543 is not the least expensive headphone amplifier available It is truly one to own.