Just listening to this right now (on full volume). It's crispy clear :P . The only way to make the headphones rattle is if the headphones are not fully sealed around my ears. Like leaving an air gap.

That is interesting! I connect other headphones and AAC is there. I connect bose and I get SBC. I will research more on this. Thanks for the update!

Just spent a couple of hours on my Mac trying to make AAC on QC35 to work. It doesn't seem to support AAC. Even if you enable it through Bluetooth Explorer, the connection establishes only on SBC. I did test other headphones afterwards though and I could connect either using AAC or Apt-X. That...