I now have had few days to get accustomed to the sound of w1000x with dx1000 pads. To say I'm enjoying these a lot is an understatement. I love these! Biggest improvement over stock is improvement in soundstage and imaging. Even though stock w1000x has a good soundstage for a closed can it lacked debth compared to dx1000. Also w1000x imaging abilities were not on par with dx1000. Dx1000 pads on w1000x combine these different presentations. Result is wide, deep and most importantly very real sounding virtual space of sound. Instruments and players are distinctively placed on their on spots. No other headphone has impressed me as much. Not even T1 is capable of such holographic imaging. Atleast not with my system. Only large orchestral pieces make me go for my open back headphones. One another thing worth noting is the soundstage height. W1000x's ability to pick height variations in sound is amazin. It is so good that it makes everything else I've heard sound embarassing. I wasn't especting anything like this. On contrary I was afraid that very deep dx1000 pads would lead into cavernous sound and echo problems.
Bass gained more authority with dx1000 pads. Not that it was lacking stock though.. Amount of air being moved is impressive. Sometimes with organs playing it feels like someone is blowing air to my ears. Not exactly preferable feeling but it should give one an idea what kind of bass were talking about. I've had similar experiences mostly with sony xb series when headphones are cranked up really loud. I would not call the bass perfect though... It could be more detailed. There is definately issue with resonances which sometimes make bass bit blurred. I added dampening into the cups to fix this issue but it wasn't a 100% succes. I will continue my experiments. What I did was pretty similar to purrin mod. Quantity-impact-quality ratio is best I've heard so I'm not going to quit now that I'm this close to achieving the "perfect" bass.
Mids are allmost unaltered compared to stock. That is great news. Now that these are definately bass oriented headphones it is amazing that mids don't sound recessed. Even though bass is very powerfull it doesn't bleed over other frequences. With vocals here is tad more realism now. Sometimes it's spooky. I was listening to Dire Straits Brothers in arms and singer managed to scare me when he started singing. For lack of better terms it sounded allmost as if it was a binaural recording. These headphones have ability to make great recordings sound even better but equally impressive is how forgiving these are for lesser quality recordings. It has been a while since I've listened to my old heavy metal favorites and and actually enjoyed the sound.
Highs are the only drawback of using dx1000 pads. Those are clearly recessed. Adding more dampening to the cups will fix that but some of the bass will be lost in the process. Even though I usually don't eq my headphones I made expection this time. +1db was enough to fix the problem for me. Even with eq I still miss treble presentation of T1. w1000x lacks the air and sparkle.
I recommend everyone who has a change to try w1000x with dx1000 pads. Really fun bassy sound but superior imaging makes it much more then just fun. I'm sure people who are not that keen on bassy headphones or have problems with colored (woody sound, resonances, occasional echoes) would not like these. But I do. A lot. I might have found my end game headphones. :)