So I decided to try the stock HiFiMAN Velour pads since I had them lying around and do the open grill mod. @Armaegis said the Vegans were too dark and murky for him, and I have to agree with that description regarding my ZMF Suede Auteur pads. I know the Vegans are thicker and looks like they have a different hair screen, but they sorta measure the same. I feel like the Velour pads get a lot closer to a "balanced" sound for me. That is bass, mids, treble form a much more coherent whole; there's nothing that sticks out as a sore thumb like how the HD650 has incredible mids but the rest is so-so. Another improvement is the resolution. There's no longer this covering over some of the smaller details like reverb. Vocals also have much more clarity, it's like a cloth was removed over a singer's microphone. I was worried the stock pads were going to give me treble spikes of death like I got when I had the Modi 3 hooked up, but not hearing it. I don't know WTF the Convert-2 did to tame the excess treble energy, maybe the lack of top end air helps? I listen mostly to studio recorded music, so I don't hear a huge soundstage expansion like others do with the open grill mod. It didn't make a difference to me. I'll probably still keep the grills off though. If anyone has any recommendations for a different pad to roll, I'd be up to try it.