potmeter value affecting sound

[slantedpanted]

Heres the case:

I have a humbucker bass with a 250k potmeter and it sounds muddy - now if i change the pot to a 500k it will sound brighter.

my question is: will this reduce low end and add brightness or just add brightness?

[Bootzilla]

It will add brightness which can be perceived as a loss of lows. The change in ohmic load will effect the hight of the resonant peak. Check this link on how pickups and its circuit work and how the resonant frequency is characteristic for pickups. http://buildyourguitar.com/resources/lemme/

[line6man]

Technically, you are not "adding" brightness.
The 250K pot is masking that brightness, and by switching to 500K, you are hearing the more natural sound of the pickups.

You may find this thread useful:
Passive basses and the volume control, an explanation (science warning)

[slantedpanted]

..i theory i can put in a 1meg potmeter to max out the highs and still retain the low end?