How does the diameter of polepiece magnet affect the tone.

[cembo]

How does the wider pole-piece change the tone. I have came across the information that wider pole-piece suppose to increase the output. My question is, why would manufacturer go for this option when output can be increased by simply add more winding around the magnet. Is there any particular reason for wider magnets, does it add more bass into spectrum besides the output or does it change dynamics or tone attack.

[darkandrew]

I don't know about wider pole pieces but more winds generally equates to increased inductance and capacitance which in turn leads to a drop off of frequencies at either end, leaving the pickup's tone more mid-dominated. There are a number of ways that this "band-pass filter" effect can be addressed such as using different thicknesses of wire, different materials to insulate the wires, different magnet materials and scatter winding. This was essentially the same effect that active pickups were designed to address - an active pickup has fewer winds and therefore has a flatter frequency response but needs a built-in preamp to compensate for the coil's low output level.

[cembo]

I don't know about wider pole pieces but more winds generally equates to increased inductance and capacitance which in turn leads to a drop off of frequencies at either end, leaving the pickup's tone more mid-dominated. There are a number of ways that this "band-pass filter" effect can be addressed such as using different thicknesses of wire, different materials to insulate the wires, different magnet materials and scatter winding. This was essentially the same effect that active pickups were designed to address - an active pickup has fewer winds and therefore has a flatter frequency response but needs a built-in preamp to compensate for the coil's low output level.

... thanks. So more winds gives more midranged sound along with increased output. So my question is, if you want to avoid mid-ranged sound (like in case of Mother's Milk) you can increase the output by increasing intensity of magnetic field just by making pole piece larger (wider) instead of add more wire into coil ? ...