Could someone give me an honest answer as to what amp/dac class you need to get 99% of what the Stealth has to offer? I don't want to spend stupid money and currently have the Fiio K5 Pro
I'm not sure about the Stealth but for my V2 I started off with a Topping DX3pro+ which is a similar class amp as your K5 Pro. It sounded lean, harsh, and lifeless. I tried them on a Burson Conductor 3 Performance and it added a lot of warmth/fullness with smoother treble and much deeper bass. I then got the Conductor 3 Reference (I buy everything used btw) and that's when the Arya's finally opened up with the incredible separation and immersive soundstage.
I'm sure the Stealth would scale better than the V2 so maybe the Conductor 3 Performance would be more than sufficient? If you are looking for a DAC/AMP it's worth trying out a Burson, especially if you are local to them!