thebassdocter said:
that depends on your pickups and guitar cable.
yes for low and medium output stuff the bigger # is brighter generally applies.
this does not extend the bandwith apreciably though. the upper roll-off is determined by the capacitence of the curcuit and the inductence. the cable is the largest sorce of capacitence to ground, that is if you don't have the tone rolled off. long or spiral cables are the worst.
however there is ussually a bump in the upper mids or treble depending on the pickup and cable combo. a larger value pot increases this effect, or i should say doesn't reduce it so much.
so it increases treble output vs a 250k, it doesn't extend it
a lower value value will flatten out the responce, a very low value like 100k or less will become a low pass filter with the inductence of the pickup and then you lose high end responce all toghther.
there are exceptions. i've seen a chart for an invader from seymour duncan and it's bump is in the mids to low mids. no pot change or even a lack there of, can make this a bright pickup. the chart showed i think a 500k a 250k and a 100k on this pup and there was only a slight diference in output, the curve didn't change much.