I've had a pair for a long while, finally thinking of actually putting them in a box.

While looking about for files and projects I noticed something tonight, what I have is ND20TA-6, and what's on the site is a ND20FA-6. Both the types (front and rear mount) have a "F" in their model, unlike mine, and Zaph's Aura/Dayton project where he uses a "ND20TB-4" rather than a ND20FB-4.

So, typo? New model number over old? Completely different tweeter? Nothing of significance?

Inquiring minds wanna know, and all that...