Home demo. ProAc D48R and Spendor D9

An honest question from someone who has never owned a speaker with a ribbon tweeter, but has never had a problem with soft dome tweeter. Is there a concern that a ribbon tweeter is so fragile that one should consider purchasing the D48 with the soft dome tweeter instead?

Is the difference in sound that pronounced?

You are right ribbon twitters are much more sensitive than dome ones but they are much better , the differences are substantial : more details every small naunce is comming to life ,voices are liflike natural . ribbons are suppirier at every aspect.

For my own I always prefer soft dome on hybrid Proac (and I have ribbon tweeter at that time in my Analysis Audio) because of better coherence  between dynamic medium and ribbon tweeter. Even if ribbon tweeter is better.
But that’s only me. 

@seagod77,I am slightly perplexed - you have a bigger room size than me. Is there a limitation as to why you cannot pull the speakers more than the distance you specified? While true that overall room size is bigger, the distance to back and side matters for imaging and depth of sound stage. If you don't allow the speakers to "breath", then you will have lot of smearing in the imaging area and depth will be shallow and you will end up blaming the speakers for being "in your face". One thing that will favor the D48 overt the D9 is that they are downward ported instead of being back ported.
As far as ribbons are concerned, yes they are sensitive and placement is important. But ProAc's approach to ribbons is pretty good and even when I sway my head a few inches in any direction, the change is not drastic as some other designs I have heard. When you take the time to properly position the speakers, the imaging, midrange and vocals are breathtaking.
@jetter,While the ribbon is delicate, it is protected by a grill. If you check my system, I have a close up pic of the D48's ribbon tweeter. That should give you an idea about the ProAc's ribbon.

I have the D9s in a ~ 13x17 well-damped room with 26" behind them and ~ 20" to the sides.  I get great bass from them; it is deep and musical but not overpowering.  I went to the D9s from sealed Magicos so I definitely would have been aware and annoyed of a boomy sound after making the speaker switch.    I was concerned after hearing the D9s at the dealer's slightly larger room that their bass would overpower my room and was going to try the D7s, but in the end I feel the D9s work fine in my room.