For sale: Elgato Wave XLR, discontinued from the market. It powers all XLR mics at their full potential, allowing you to adjust mic quality, isolation, and everything else. You can also connect your headphones to it and adjust levels as you please. I also have a Fiio K5 Pro amp that powers professional headphones at their full potential (its sound is very loud). Examples like DT 990 Pro 250ohm: if you have professional headphones without an amp, you're losing more than half their power. The items are used and clean. Whoever buys them can test them on my mic and headphones. Price is negotiable (open to offers).