I was right, the M22s and my QS8s all have the hexagon gold plated nut and the VP100 is round knurled gold plated cap. I would bet the VP150 also had the round caps, not nearly as nice as the hex caps to tighten up, especially with 12 gauge wire.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70