Okay after listening to these for an hour or so I can say that I'm still trying to figure out the sound. Brain burn-in is a funny thing. When I first heard the FX700 I thought they were offensive bass monsters but over time I came to really love their natural sound and great timbre. The details were all there, they were just presented in a different way from what I was used to. The A1's are similiar to the FX700's in this regard.
Inks has described the sound of the A1's very well. Compared to the CK10, they are airier, probably a result of a more v-shaped sound signature. True to the v-shape form, the A1's place noticably less emphasis on the mids, and to my ears sound almost too thin as a result. This brings me to the bass, which is the subject of this thread. Personally I don't hear much more if any more bass on the A1 than I do on the CK10. This could be a result of different fit, or my source... scratch that. It's my sources. Out of my brother's iphone 4 the sound signature has changed tremendously from what I have just described. The bass is much more filled out, finding a nice balance with the treble and eliminating the thinness referenced above.
It's unfortunate for me that the A1's are picker with sources than the CK10's. Paired with the iphone 4, they have picked up a nice amount of detail, definitely in the same league as the CK10, and have a nice hefty bass that resembles a dynamic in slam and weight, and even timbre, but retains a bit of BA quickness.
I will listen to these much more in the coming hours, but my preliminary verdict is that, given the right source, I could accept these as a CK10 with more bass. Some differences in regards to things other than sound: the cable is not at all as hardy as the one on the CK10. It seems like quite cheap, although microphonics are nonexistent wearing these over the ear. On the plus side, the cable is lighter than the audio technica's, resulting in less weight dangling from your ears. Personally, I don't mind the cable in a practical sense; it works for me.
Fit with the A1 is almost as good, although they are larger I was able to get a seal right away. YMMV however, as I have somewhat smaller ears and the CK10's fit like they were specifically made for me. I suspect fit wouldn't be an issue for most people. Once the A1's were in my ears I found them very comfortable.
More to come. I need to get more music on different sources to give these iems a better evaluation. So far I am really enjoying these. Thanks Inks and everyone else for all the great info you've provided.
edit: The A1's also sound great with the ipod classic (6g), quite similiar/the same as the iphone 4.
Edited by gnarlsagan - 11/1/11 at 5:03pm