Here's a little bit of update on the AD700 vs A900 front.
I'm returning the A900. After much use, I just can't justify keeping them. Since I've washed the AD700 pads, the AD700 is much a fair bit more comfortable, and I find myself listening to the AD700s more than the A900s for more reasons than just comfort. The A900 sound a bit muddy to me; especially in the low-low/mid. I actually prefer the bass on the AD700 - it's much more detailed in my opinion. I was listening to some trip-hop (Emancipator) and thoroughly enjoying it. Sure, there's not a lot of volume there, but it's clear and detailed. Also, the A900 just doesn't have the sparkle and detailed highs that the AD700 has.
I actually think the AD700 has improved a good bit since I've gotten it; though, it could just be my imagination. The highs seem a little more tame, the bass has opened up, and the itchiness has gone away almost entirely (maybe another wash would fix that completely). Overall, I just enjoy the AD700s more.
As a result of this, I ordered a the Beyerdynamic DT990 Pro (250 ohm), and these should be arriving tomorrow (17th).
- If I like their sound signature, I'm probably going to buy a Little Dot MKIII as well, since my current amplification method is just not up to speed. I'm buying this set of headphones mostly for the music aspect, but if they are good for gaming then that's awesome as well. In any case, I'm definitely keeping the AD700s. I like them more and more every time I listen to them.