After my experience with tuning this new Chinese ck12, I would never again buy a ck12 without certified polar and frequency response graph.
Ck12 is so fiddly, and even if it works as it should in say cardioid, there's no way of knowing if it will perform properly in omni, F8, off axis....
The issue of being bright or dark is least of my worries. I can totally see why AKG gave up on these. The only capsule that gave me this much trouble was a vintage kk84 for the same reason. And this design was abandoned for the upgraded kk184.
Tim's 2017 capsule I have checks all the boxes claimed in the AKG's patent document. But yes it is bright. However I don't get the complaints regarding the voicing of his capsule, he has stated so many times he can tune the capsule any way customer likes. Also I know for a fact he measures response of his capsules. He can make both shallow, and deep dish. Just like there are many AKG Ck12, there are many variations of Tim's CK12. This is also mentioned in FOX audio research CK12 journey from many years ago as they specified what type of CK12 they wanted.
Making a CK12 without measurement setup is impossible simply because the requirements of the patent, and detailed manufacturing process stated in the blueprints. You have to measure the response in between the steps. I don't know if all mentioned manufacturers do this.
Published MBHO Ck12 graph makes me wonder if even they know what they are doing. The cardioid response shows omni behavior, which happens when you mess up chamber tuning.
To be clear, i'm not defending
@Tim Campbell here. I was the first one to jump at his throat on several occasions, but from my interaction with him both here and in private I am 100% convinced he is a person who knows exactly what he's doing when it comes to CK12. I can't say that about others, simply because I haven't interacted with them.