Hi,
I have the PAP Trio 15 Horn1 and had the Fidelium ribbons for trial on the interior wiring. They sounded good, a bit better than the VDH that came with the speaker, however I sent them back because I didn't think they sounded $1600 better. As silly as it sounds I ended up talking to Paul Speltz at Anti-Cable about using his wire for internal wiring, and we came to the decision of trying solid core 12GA wire (3.1) single run. I was blown away at the difference in the sound, clarity, imaging, bass, midrange, treble, you name it, it improved. The soundstage became much larger. The speakers are much more dynamic, I'm thinking the solid core wire is allowing more data or current to get through, I hear details in pieces of music I never heard before, even with the Fidelium ribbons. It cost me $90 and to my ears they beat the Fideliums. I did see someone use the 4.2 Anti-cables on a PAP Duet pair, but don't know the results.
YMMV..check them out.
Jefferson