Re: Ceramic 5 vs Ceramic 8
There are almost as much types of Ceramic mags as they're Alnico.
However, to only ones I've seen used for guitar p'up making have been C5 and C8.
I don't think I can hear a tonal difference between them, but I hate ceramic mags with a passion, so don't mind me.
They're used because they're cheap, and it's bright nature permits to also use brass baseplates and cheapest alloys for screws and slugs.
I'm no saying you can't build an excellent sounding p'up with those materials, but I yet have to hear one. To my ears, all ceramic p'ups have a "brittle" quality that makes me instantly think of "cheap", and I don't think I can go pass that.
I do like ceramic p'ups in a bass, though. My Peavey Cirrus BXP 5 has them and I think it sounds like a million dollars! Not bad for the $ 250.00 I've paid for it.
YMMV.