So I checked the stock tips that came with the CKN70. And just as I suspected. The stock tips are not recommended for the best sound on the CKN70. It narrows the sound to your ears and actually restricts some dynamics that channel to your ears. I put a Sennheiser double flange tip on one side and had the stock tip on the other. It was clearly evident. The double flange tip gives much more fullness to the sound because it has a much wider bore.
It is funny to me that AT would go all out on the actual tuning of these earphones yet completely overlook the cord and just use their stock tips. Sony is guilty of doing this as well. As far as I am concerned the stock tips are no good on these earphones. I will try it again once I get a full burn in but I highly doubt the stock tips will give out the best sound.
You are our representative here. In the name of all of us in this thread, you should write both companies and let them know about the tips and cable issues.