Quick, someone say Alnico III to cover all the bases!
But seriously, this is hilarious and completely on par with the way objectivity and subjectivity blur when it comes to these topics.
To my ears, A4 is the most neutral, A5 is the brightest (but also with the most robust lows) and has the most upper mids, and A2 has the most lower mids (but sorta compresses on the lows)
I've learnt of a complicating aspect to alnico bar magnets, and that is the level of charge applied to the magnet. Apparently no magnet has higher gauss than alnico 5, but it doesn't mean that every humbucker gets the max charge..The one humbucker that has more charge in its magnet than any other I'm aware of is Gibson's T Top....
Let's get all the facts wrong and make it confusing, and hopefully someone will show up like rubbing a lamp (the wrong way)!Long v short magnets is another ingredient in the mystic brew, just to make an already complex subject all the more confounding for those of us trying to get our heads around this subject. We love all this stuff though, don't we guys n gals? Besides I've not lost hope that a pickup guru will intervene and throw a little light our way..
Ah, but Mr. Papa, how do we know we have the right lamp to rub?? I mean is this a '59 vintage lamp we're talking about or just some random ebay aritifact from who knows where.. Darn it son were falling down the rabbit hole.. Hold onto your britches my friend, I don't know where this thread will end.. Though perhaps now is as good a time as any..Let's get all the facts wrong and make it confusing, and hopefully someone will show up like rubbing a lamp (the wrong way)!