Please use the ADK Forum! I pop in here once in while but I check the ADK Forum many times a day.
It's no secret: I think that the SDs are the weak link in the ADK line...
The problem is down to capsule design/quality/QC...
We yelled and screamed and got the ADK LD capsule production on the right track. I'm actually very happy with the Hamburg and Vienna capsules. Well, considering the street price of the mics of course! OTOH the TC, TT TL, SL and CE models use very tight tolerance capsules, you can buy one, buy the same model months later and they will sound the same. Really!
We'll keep you posted; believe me, when we have a really nice SD mic, you'll know!!!
JP