I have been reading and lurking doing research on head fi for a little while before deciding to purchase some headphones and earphones. I am just visiting Hong Kong and decided to purchase these new headphones that just hit the market here. I tested these against the Beyerdynamic DT770's,DT880 and Ultrasone 650 and the old ATH-A900.
Like I said, I am a newb here so take everything with a grain of salt. That said I am no stranger to the audiophile scene as I am very much into home audio.
Before I start my review let me start by saying that I like my headphones to be a little more balanced than most and also that I listen to a variety of music from hip hop, pop, instrumental, to classical and opera. I also like my headphones to be more tighter in than spacious. I like the music or singer to be right in front of me rather than overly spacious.
Here we go.
The new a900x is very similiar sounding to the older a900. It does have a little better bass but not significant. The 900x sounded a little stronger in the bass out of the box than the a900 that was already burned in. This made the 900x just a little more balanced than the a900. I also compared it to the DT770 and found these to be superior in sound quality to the DT770in all aspects. The DT770 IMO just doesn't have the detail in the mids or highs and sounded muffled even though it was more spatial. The base in the DT770 was stronger but I prefered the a900x more due to better reproduction of and balance. The DT880 is significantly more and I found it to be the best of all the headphones I tested but ended with the a900x because even though the Dt880 sounded better to me, it was not so much better to justify the difference in price. The DT880 had better bass and was even more balance and clarity out of the box than the a900x, Cannot comment how they both will compare once both are burned in though. The DT880 is a semi open/open design so I wouldn't be able to use it in public places like on a plane so that was another reason I got the a900x rather than the DT880. I also tried the Ultrasone 650 and the 650 had better bass but the mids and highs were not as clear. They sounded fairly good but when it was back to back testing, the a900x mids and highs clearly outshined the ultrasone 650 in that area.
If any of you have questions don't hesitate to ask.
I will post an update when these get burned in properly.