Originally Posted by RPGWiZaRD
I'd rather put HD650 as midforward than "neutral". Neutral isn't the key for everyone, some like mids, some like more of bass, some like crisp highs etc. I see a lot of people threatening what they like as "neutral". There's nothing harm in being forward in a certain range if that's what your preferences prefer. Frequency responses backs this statement up which are highly objective reflections.
X1 seems more like a bit bassforward with pretty neutral mids and highs while HD650 is a bit of a midforward headphone.
My ears agree with this. The X1's bass is the showcase, but it's done pretty tastefully and I feel it's not overly bassy. For some songs, it is really a lot of fun! For others, it is bordering on excess. The mids are pretty nice, and vocals aren't too bad, but the HD650 certainly wins out for vocals to me. The highs on the X1 were actually surprisingly smooth. On graphs, they're tipped a bit, but they sound quite smooth and lack sibilance, which is good. However, overall, the HD650 is an altogether more natural sounding headphone to my ears, with seductive vocals, greater transparency, and greater detail - in fact, because I felt the HD650 sounded more detailed than the X1, in my A/B sessions, I actually heard a slight "veil" when listening to the X1!
But, granted, I do think the X1 is a pretty good headphone. I think it'd be a great buy at $300 or less, but it is nice if it's the type of sound you're looking for. However, for greater transparency, naturalness, and vocals, I'd take the similarly priced Sennheisers. And for greater bass extension, impact, and juiciness, I'd take one of the discontinued Denons. Since I have both - I don't need the X1.