yes that would translate to thin. DT 990s has the worst thinning of the sound of the 3. It’s definitely noticeable as soon as you turn them on. Not to say their bad but its an acquired taste. Personally adore the 1990s over it cause it fixes that issue. 880s were nice… but at the time I was looking form something involving competitive gaming and those definitely were not it though I will give it to that headphone for being a great all rounder despite also sounding thin. I think the best between those 3 if you want a general headphone is the 770s while being U shaped it didnt sound as thin as the other two did and the 177x just made it a hell of a lot better same with the 1990s. Though to be fair i never tried the T1 or i think it as the T5 being the other closed back heard treble issues were involved on those though. Good to hear it sounds like the helios is a strong alternative to a dt 990