Thanks for the question. It’s a good one!
I have a 12-inch MacBook I use for Bluetooth testing that fully supports both AAC and AptX. Thanks to an app called Bluetooth Explorer, I can try to force those codecs and monitor what the Bluetooth connection is actually using.
The Crusher and Grind wouldn’t accept anything but SBC. As you speculated, yes, they use it at a pretty high bit rate. Which is good! Only the most discerning of ears would be dissatisfied, I’d wager. If that’s you, then you might want some other headphones. I imagine Skullcandy doesn’t publish this info because saying “Only supports SBC!” in your marketing materials isn’t the best look. :)
Thanks again for reading, hope that helped you out.