driving Verity Audio Parsifal Ovations?

I used to drive my Parsifals with the Tenor and didn't find it as very musical. I next switched to the CAT JL2, which was a vast improvement. I now have the Music Rerefence RM9 SE and this is the best combo by far. I A/B'ed the CAT and the Musical Reference and the RM9 SE/Parsifal was way superior to the CAT/Parsifal Combo. I think you'll be hard pressed to beat this, especially when using the Wiwires I/C's and speaker cables.

I'm been using the 4 ohm tap on my amp as I thought the manual states the Parsifal to be an 4 ohm speaker. Am I wrong? Why do you say it's an 8 ohm speaker?