I have owned a lot of different ProAc speakers and currently own the D-40r.
I think there are two significant improvements in some of the older models.
The ribbon tweeters IMO are much better than the previous dome tweeters. The bottom porting has made the speakers easier and more flexible in placement.
I think there are two significant improvements in some of the older models.
The ribbon tweeters IMO are much better than the previous dome tweeters. The bottom porting has made the speakers easier and more flexible in placement.