well, I have madisound's pricelist from year 97 therein is following details"d-52AF 89db, D-54 96db and D-54af 91db" and then I have Dynaudio's original specs for D-52, it says 92db sensitivity for D-52. I think D-52 and D-52AF is same driver, but the flange is diffrent, and that makes diffrent sensitivities.
I'm very disappointed to dynaudio regarding their policy to help DIYers. I understand if they don't wanna sell to DIYers their brilliant drivers anymore, But I don't understant why they took all specs away from their wwwsites, and they don't reply for any Emails regarding those specs, why??? I just want to have frequency response curves for D-54 and D-52 midrange drivers, other specs I have already.
I broke one of my D-54 and I didn't get a new one, but I got D-52, Now I have to modify my filter, And it is quite difficult without curves.