#1
Hey guys this has always been something that confused me and I was just wondering if there is any rhyme or reason as to why certain pickups sound good with some kinds of tonewood and not others. For example, im looking at a set of P-90s but i have no way of telling how they will sound in a mahogany guitar. They are alnico 5s and have a 6/5/6 eq rating...

Thanks
Gear

Soon to have Carvin California Carved Top
Fender MIM Strat (Warthog, Spotlight, Condor)
Epiphone Les Paul Custom
VOX Valetronix Combo
Boss ME-50
Alvarez Acoustic
#2
Well, P-90s don't actually fit in humbucker routed guitars. Just so you know. You'll have to get humbucker shaped P-90s.

And a lot of a pickup's sounding good in different woods has to do with the magnets, I think. For starters, at least.

Alnico 2 will warm up an alder guitar. Alnico 5 is a bit brighter, though still warm. It can add some snappiness in the bridge position, especially in a Mahogany guitar. Ceramic is a little more harsh, it's definitely brighter, and more aggressive.
Very general statements, but that'll give you an idea.
#3
alright thanks that kinda helps clear things up a bit...im looking into P-90s for a jazzmaster type guitar and i think the Seymour Duncan Stacks looked pretty solid for the style of music i play
Gear

Soon to have Carvin California Carved Top
Fender MIM Strat (Warthog, Spotlight, Condor)
Epiphone Les Paul Custom
VOX Valetronix Combo
Boss ME-50
Alvarez Acoustic
#4
Alnico II is the softest and generally has a smooth bass and treble although this is more pronounced the hotter the windings get.
Alnico III is very transparent, low output and clean,sounds great for rounded fat jazz applications-typical of '50s tone.
Alnico IV is probably the best vintage tone IMHO(for humbuckers) and along with II and III was used in the earliest PAFs-this is a fact and not myth as we've had them analysed and a collegue of mine has also seen original Gibson purchase orders that clearly state AIV bar stock being purchased.The tone of AIV is balanced and extremely organic, it produces the most authentic vintage tone and sits better in slightly hotter vintage winds than AII which tends to get very soft in the bass and highs if used incorrectly.
Finally Alnico V is the hottest producing more highs and lows, great for rock applications or where power and cut are important.
Different companies use different grades for personal reasons, we use all of the applicable Alnico grades to suit the correct design, both to be historically correct but more importantly to have the best sound.

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#5
I think it was gibson who used the p90s first in the LP and SG. They mount different they dont use the rings like a standard humbuckers does. They use a spring under the pickup and screw dirrectly into the body. The hole for the screw isnt threaded so couldnt use the rings.