The bass is definitely the best I’ve heard from a Grado and probably one of the best I’ve experienced in any headphone. Not for bassheads, but it’s deep and impactful for a Grado. The mids are classic Grado, no issues there. The treble is beautifully extended and smooth, with no harshness or sibilance so far, and it’s not overly bright, especially if you’re familiar with other Grados. I’d say it’s similar in brightness to the RS2x. Yesterday, I was worried it might trigger my tinnitus, but no problems at all today. When you get yours, you might have the same initial impression, but trust me, the drivers really need about 24 hours of burn-in to settle. Also, I’m running them on a warm setup, which probably helps a lot.