[Det_Nosnip]

Originally Posted by I_am_the_one

Passive pickups send a low output, raw signal to the amp that can only be affected by the volume and tone controls on the instrument itself. Passive pickups tend to lose the extremes of high and low frequencies, but still give a very even and punchy tone. This is because passive pickups tend to push out more midrange frequencies. While passive pickups might give players less dynamic control, their smooth sound is still very unique and desirable.

Active pickups have preamps that are built into the pickup housing; so they can drive the signal to the amp themselves. This preamp must be powered by a source other than the amp, so active pickups require a separate battery to operate. This allows the pickup to send a higher output signal, producing a more complete, full-range sound than most passive pickup systems and giving players more control of instrument dynamics, projection and tone.

Active VS Passive pickups...

http://www.youtube.com/watch?v=pSDac4In9ho

Wow, thanks! Great post.