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The BA drivers in the FADs use are solely manufactured for FAD in Indonesia, so it's proprietary. It's certainly a less common implementation, but the details aren't that well known in regards to their "BAM". It could just be your typical venting but the SS have proven to bring out something unique about them in their sound signature which can be due to either of the two mentioned factors.
The thing is, I can see these doing well with the 2 BA drivers (not complaining about them being a dual) but even if they perform I suspect we will be at J-Phonic/CK10 level of performance which still won't justify that pricing.
The 15.5mm driver in Piano Forte II is claimed to be proprietary too, but the $80 earbuds still get beaten by Sennheiser $26 MX580. I have my reservation when it comes to the correlation between proprietary driver and performance. My last audition of SS certainly doesn't left me with any outstanding impression besides sibilant and brightness. Proprietary is in most cases, a fancy word for make-to-spec custom order. If you have cash to waste, I am sure you can custom order 'proprietary' driver from Knowles or Sonion as well. FAD said the BAM thingy has already applied for patent, I hope to see the documents when it gets approved (though Japan patents are pretty hard to search).