Lots of love for this pickup but I'm a huge P-bass fan and I didn't like the PV63 at all.
First the frequency response:
The mids were just wrong to me. It's the kind of mids that make most roundwound strings sound hollow and clanky IMO. It felt like the lower mids were focused too high (boomy, hollow) and the upper mids focused too low ('clank' rather than 'zing'). I could have lived with this if worked great the mix but it didn't. It's very undefined in the lower mids/upper bass frequencies where I normally want a good P-bass to 'sit'. I tried many different rounds but the PV63 always just sounded clanky and hollow to me. I kinda liked it with Pyramid flats but then I like just about ANY bass with Pyramid flats so that's hardly a ringing endorsement for the PV63.
Secondly the dynamic response:
It doesn't compress/saturate like I want a vintage style P-bass pickup to do when I dig in. Saturation-wise it's very 'clean' and open. But it also creates HUGE spikes when I dig in! I actually have to hold back to avoid clipping when recording. Very nasty spikes, none of my other P-bass pickups behave like this. These spikes severly reduce the input level before digital clipping when recording, especially when going direct (unless I use a very fast clipper/limiter before AD-conversion, which is something I would rather avoid). Awful pickup for recording IMO.
I've seen lots of people saying Fender nailed the early 60s P-bass sound with this one but I strongly disagree. I absolutely LOVE the early 60s P-bass sound but this ain't it. Maybe mine is faulty/out of spec, it's Fender after all so QC is expected to be rubbish.
I guess Fender has designed yet another pickup to add to the rest of their completely different sounding 'accurate reproductions' of the early P-bass pickup, lol. For what it's worth I actually like the Custom'62 and the Original a lot.
But like I said, lots of love for the PV63 so maybe mine is out of spec. Or maybe we just have different taste in pickups and different views on 'the early 60s P-bass sound'.
Doesn't make a lot of sense to me to try and judge an early 60s sounding pickup with round wounds, obv not going to get that sound with those