Only had time to mount the four M75-PVCs yesterday, in the slant cab pictured above. It's a Hendrix RI stack cab which I've upgraded the internal bracing and soundpost on, and installed EC Collins pinstripe. I quickly sold the G12C speakers in it, thought those were pretty harsh sounding. Very crunchy and sizzly, which actually sounded pretty cool for clean Strat sounds with a JTM45/100, but unusable for anything else really...
I also had a quad of '69 G12M 75hZ speakers in there for a while, but since I have another cab with similar speakers I decided I wanted to try the PVCs, as they match the cab aesthetically...i.e. they're both clones of a '66-67 style cab and speakers.
I'll reserve the full review until I have more time with them, but I am *very* impressed with what I hear! They have the same warmth and fatness of the '69 speakers, but with even more articulation! The bass is actually much tighter - there's not really less bass, but it's beautifully under control. Mids are just as they should and as expected for an M magnet greenback. But the real beauty is in the upper mids and high end, where these speakers really, really shine! The '69 era G12Ms have a very warm and almost soft top end, even the 75Hz ones. These M75-PVCs are really open on the top end, but never harsh. They also have this very fast response to them that mates beautifully with the lower gain Marshall plexis. A Strat sounded much more alive with these speakers, yet a Les Paul had the same full, fat sound.
A friend of mine has a '66 4x12 with G12Ms (two H1777 cones, two 102 003 cones, but April '66 date codes on all speakers, IIRC). Another friend of mine recently scored two '66 Marshall PA cabs with similar speakers, so I've played originals of these before. While this wasn't a side by side comparison, these speakers remind me a LOT of what I've heard from those cabs.
Hope to try the H55-PVCs later today, and will come back with a full review when I have more time, but initial impressions are *very* favourable.
I should also mention that Jim, as always, is a total pleasure to deal with. I've pestered him about these PVC speakers for what feels like years now, and he's replied to every single annoying email from me. He was even generous enough to do FBI on these speakers free of charge even though it's not normally an option on these models. I'm not even sure if I should mention that since it's not something that's offered as an option, and I don't think anyone should expect the same...but I wanted to mention it nonetheless. Jim, here's to you!
JTM45 RS OT, JTM45 BB type I, JTM45/100, JTM100 black flag, JMP50 1986, JMP50 1987, JMP100 12xxx, AC30, BFSR, Boogie Mk 1, Hiwatt JPP100, CP103, DR103