Lewguitar
Old Know It All
So Roughcast Alnico 4 might be a better magnet for you. I like alnico 5 in a bridge pickup but I like A4 in a neck pickup.This is cool information. Next time I will try an Alnico III in the neck, love the SC reference. I like the V a lot better for neck application than the II, but it has a little too much bass. The III might fix that.
A4 is a slightly weaker magnet and has less bass so it doesn't get as muddy as A5 can sometimes.
A4 has less treble bite than A5, but more treble bite than A2.
A4 also has tighter bass than alnico 2 and not quite as much bass as A5.
It's sound is right between A2 and A5.
At least that's how I hear it in a neck humbucker.