Excellent , These pair of Opaamps can make me the Topping D30 feeling another step of the music passion.
Sound more details than before. The power for my HD 6XX even better.
Personally, I recommended for this upgrade if you explorer the headphone sound further.
Cole319Really? Interesting. I just went off of a teardown image I saw online. I guess they changed the specs and added a socket. I'll pull mine apart and see if I have the socket in mine and switch them out if I do. I'm curious to see how much of a difference there is. I've read that the output stage of a DAC can make a huge difference in sound quality. Curious to test that theory. Thanks!