Rozzar,
With the MS30, they are built with internal bracing at each corner. In order to get at this bracing, you'll need to remove the rubber mounts on the baffle that hold the front protective cover in place, which can be scooped out with a flat head screwdriver. If you look round the back of the speaker, you should find 4 circular caps in the corners which support the other side of the bracing, although I can't recall whether these need to be removed.
Either way, once the bracing is loosened, you'll be able to remove the front baffle, although you will need to disconnect and remove the drivers first, although I'm not too sure why yours didn't come straight out. May be you'll need to have a look by removing the speaker terminal first..
It may be the Classic ones you have are held together differently.
The gold anodised tweeters on the MS range came with the updated 'i' series. Mine were the original MS with the silver ones.
If you haven't tried already, providing you don't have any inquisitive kids around, I'd recommend removing the round metal mesh grille that protects the tweeter, which can help open up the treble. They're held magnetically in place and can be carefully levered out with a small screwdriver.
I believe that the MS range were designed by the same people who did the Epos ES range (esp ES11). Look at the physical similarities of the drivers esp. the phase plug on the bass driver.