I am one of Grover’s friends who auditioned the JPS speaker and IC wires.
I am the archival transfer and (sometimes recording) engineer for a local Los Angeles symphony (LAJS) and have a large record and CD collection (39,000 LPs, 78s and CDs). I have several audio systems at home (in different rooms) and have been listening to high end gear for decades.
We spent several hours comparing wires and it was easy to tell which was musically more enjoyable. The JPS speaker wire was worse in many respects. It lacked resolution/blurry, has subdued mid-bass/non-linear and sounded bloated. It was not just the lack of timbral accuracy on the Crosby recording, but a lack of music timing. Less involving despite the peakier highs. The Searchers literally lost their high vocalist in the mix, the harmonic structure was constricted. Sinatra, Torme, Crosby and Dean Martin lost their manliness, the important foundation of the their voices.
Add to the musically inferior music/sound quality of the JPS their terrible coat hanger-like physical structure and it is one wire I would never use in my system.
The JPS IC was not as bad as the speaker wire but exhibited similar traits. Grover’s IC with the older teflon dielectric was clearly superior which I happen to use in my best hi-fi system. On my EAR system (864 pre-amp, 890 amp, acute CD, and 324 phono) , his wire brought out the best sound yet. It maybe that the JPS wires are system dependent, whereas Grover’s IC, A/C cable and speaker wire are not system dependent. I prefer to relax while getting the best sound out of my system sonically and musically. The JPS wires are just less involving and of lower fidelity.