soix,
I was wondering exactly the same thing.
I also wondered if perhaps the new Pulsars smooth out the slightly "overwarm mid bass" (as reported in Stereophile).
One of the reasons I changed direction from the Pulsars to the Perspectives when auditioning the JA speakers is that, as great as the Pulsars were, I could detect that bit of midbass coloration, especially in lower male voices. The Perspectives seemed more linear in that part of the frequency response.
Not sure Jeff Joseph would deliberately smooth away that midbass warmth as it may be part of what makes the Pulsars sound so complete and rich for their size, on lots of music.