Re: What determines a pickups sound?
Coma said:
What's the difference in sound between scatterwound and machine (non-scatter) wound?
Scatter winding, as Luke says, can be done on a machine, but what scatterwinding really means -- if I understand correctly -- is there is some degree of randomness to the wind pattern. Guiding the wire with the hand inherently adds "imperfections" to the wind that make it to one degree or another "scattered". It isn't wound in perfectly neat rows back and forth in some geometrically precise pattern, which is what is really meant by machine-wound.
The effect of irregular wind patterns is to change the capacitance of the coil (the tiny amount of current that leaks through the insulation of the copper wire). For whatever reason, this adds depth and complexity to the whole frequency spectrum, but especially the mids.
(See my thread on "My Wacky Weekend Winding experiment" for a humorous adventure in true scatterwinding -- with my bare hands! That coil looks more like a ball of yarn than a pickup! And talk about clear, detailed but warm mids!)
Coma said:
How does the number of wire turns affect the sound?
More turns equals more output (power/volume/sensitivity), and past a certain point, more and more midrange at the expense of the highs and lows.
Coma said:
What effect does the pole pieces have (standard screws, Invader-type screws, allen screws - or whatever those on the full shred are called)?
The height of the poles relative to the pickup itself, to each other, and to the slugs in the other coil have more of an effect on the sound than the type of screw. However, though some say the screw type has no effect at all, in my experience it does matter. One thing I've noticed in particular is that the Seymour Duncan screw heads are much smaller than those on a Gibson pole piece -- the Gibson poles are noticeably louder and ruder.
Another interesting thing to note is that grinding the other end of the pole piece down adds more output and midrange by concentrating the magnetic field more toward the strings. Even 1/16" will make a noticeable difference.
I know what you're thinking but I didn't believe it either until I tried it!
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