The Abyss certainly has its strengths (impact, dynamism) but the treble disrupts the coherency of the sound, and the comfort/build is absolutely awful for a $5000 headphone. Hard, stiff, heavy and just an abomination to wear. But I can certainly understand why some like it, it is a unique sound in several ways.
BUT this Pioneer bullcrap, I don't understand how one can like. It's absolute garbage and I must say, if you think that's the optimal representation of music, you are seriously out on lost waters. Please do try and spend some more time with higher performing headphones like the STAX, LCDs, HD800S, Utopia etc to properly adjust to them and to get an understanding of just how messed up is the sound of the Pioneer. Some people seem surprised it's not so popular/endorsed and blame marketing. Well I blame the bad sound. Mark my words, it won't be long until Pioneer discontinues this headphone.
I think people are just consumed by the "new kid on the block"-hype and to hear something which sounds so markedly different to more popular headphones, same goes with the ED10 for example. Suddenly the Pioneer is the reference and other headphones lacking its distorted, muddy ("warm?!") bass and bright, metallic ("exciting?!) treble suddenly sound dull and boring.
Before y'all bash me completely, check out measurements. Innerfidelity has em and they are not biased and they do not lie. Frequency response clearly shows an overabundance of treble with some horrific spikes going on. Also note the big, broad 100hz bump which clearly indicates a lower mid coloration. And let's not even get into the severe ringing going on, or the ludicrous bass distorsion.
"But measurements don't translate to what I hear, it's what I hear that matters!" - For you maybe, doesn't mean you're right.
"Obviously something wrong with that unit as mine doesn't sound like that at all." - Yeah that must be it! No. No company would never send out faulty review units, it's an absolutely terrible marketing strategy. And while changes may have been made since Tyll's measurement data was published, I highly doubt it. This is obviously a very poorly engineered and implemented driver which would need to be reengineered to make the product sound any good.
Also know that the staff in one of my more local audio stores selling the them even admit that they're ****.
To people actively reading this page who are interested in this headphone, save your money. You're welcome!