I just got my H6 2nd gen delivered today from Amazon.com in the US. Granted, I'm not what you would call an audiophile, more of an audio enthusiast, so I apologize if my analysis isn't very technical. I've been a lurker on here for a while, but I HAD to make an account in regards to how amazing the sound quality of the H6 2nd Gen is. Volume is excellent, with the overall sound being very neutral. Highs and mids are deliciously clear, and bass response is impressive too. The bass response is actually quite similar to my Philips Fidelio X2, with maybe a slightly less amount of emphasis (The X2 is a more bassy, although open-back, headphone). Regardless, it sounds very punchy and was more than perfect for me, I see no need for any amplification whatsoever. I had previously tried the H6 1st gen at an airport, and had found the sound to be quite weak. These 2nd gen headphones most definitely sound different to me now, but I'm not sure if the loud airport setting maybe drowned out the bass from the 1st gens a little bit. Regardless, 100% would recommend. I vastly prefer their sound to both the Sennheiser Momentum M2, which I extensively tried in store, as well as the V-Moda M100 (with XL pads) which is sitting beside me now in a bag to be returned to guitar center. Oh and also, comfort is spectacular, and both sound and fit are not at all fatiguing. I can't get enough of these things!