I have an opportunity to purchase a mm pup for 40 bucks. MM's are made for active electronics and I want to put it in my P bass which is passive. Will I have to change my bass to active to get the most out of the MM? I really don't want to have to do that. What will happen if I install it anyway? And what is the difference between active and passive pups? Number of windings? Please respond asap. I don't want to lose this deal if it will work.