CrystalSky
Well-known member
Oh, they just had a detachable cable and they say that piercing highs have been rolled off a little in Pro X. I heard 990 are especially notorious for that.The Pro X versions have completely different drivers, lower impedance, and are not the same headphones. The 990 Pro has been a studio staple for decades. If it ain't broke, don't fix it.
I don't know anything about the 770s but I'm guessing the X versions are different there too. I personally wouldn't consider closed back headphones for playing guitar. YMMV.