That lens is supposed to say JBL, not Pioneer! Same for the Richard Long-style bullet tweet arrays.
The Pioneer "Wav-Lens" look like a pair of JBL 2395's stacked on top of one another. Based on the Pioneer specs
there about the same size as well.
JBL even did a gold anodized version of a similar design horn the 2390 that used folded plates to reduce the over all size.
This wording may mean something......or not!
"Pioneer's exclusive horn design, which is attached to the lens to deliver wide and even coverage across a large frequency range"
The JBL 2395 lens was used with a 2343 elliptical mouth exponential horn.
I think the early Clair S4's used that same horn without the lens attached.
Yea old is new again, now if that same thing would just apply to some of the shirts hanging in my closet!