IK Multimedia ToneX Plug

This is without a doubt the headphone amp on the market with the highest fidelity sound. Straight A's for that one. But the app is just awful, the tweak-ability is very limited compared to other similar products and the user experience is just really poor. Don't expect to buy this and just use the phone app. This requires hours and hours of searching for the right captures on a desktop while connected via a usb-c (why can't this be done via Bluetooth?). You have to LOVE the sound above everything else (and it is really good), and be willing to put in the hours making the right set of presets that you won't touch on the app so that it literally just becomes a preset-bank that you switch up and down so that it becomes a "set and forget" piece of gear. And if you like just a little more "something" on a particular preset, you have to be ready to go browse the infinite tonex capture vault again to find an entirely new one. If that is for you, then this is the product for you.