Dunlavy SC IV extra tweeter felt?

I had sc III's and the felt was present on my speakers as well.

The felt help remove peaks in response that can happen because of cabinet design... We were doing this in the late 70's... Felt can make a serious improvement in cutting defraction... depends on the drive and cabinet.

I wonder if there might be some confusion here about whether the thick wool felt was utilized to closely surround specific drivers or actually attached to the cones/domes of drivers?

Felt being "present" for example is pretty vague.

My assumption in my response was the OP saying four felt pieces were attached to (over?) the domes of his tweeters. If that was not the case then disregard my comments.

I agree, there seems to be some confusion. Does the OP have the ability to post any pictures of his speakers?

"03-12-15: Pryso
I wonder if there might be some confusion here about whether the thick wool felt was utilized to closely surround specific drivers or actually attached to the cones/domes of drivers?"

In this case, it was both. If you look at a pic of the speakers, you'll see the tweeter surrounded by a felt/cloth type of material. It doesn't touch the tweeter, it just surrounds it. The OP was talking about actual pieces of felt attached directly to the drivers themselves.