Just got the preamp today. After the preamp attached, the sound was kinda flat and soulless, similar to what you said, couldy. But after I changed the stock pair of 6n3 tubes to ge jan 5670w, the sound is so so much better. I never thought that changing tubes can make such a huge...

I got my DT990 PRO few months ago. At first, I felt the bass was too fast into my ears and the mids were recessed. After a long time of burn-in and changing the cable that connects my laptop and amp from the monster icable to a silver plated ofc cable, it does improve the mids and make the...