Ok, I've got a 5-String bass with an Alder body and a Mahogany neck. I'm pretty sure the current pick-ups are active, (No sound at all without batteries.) The current pickups are both J style, stock, pickups. These pikups were made by the same company that made the bass, SGC nanyo(Went out of buisiness in the early 90's, so no info sound clips etc. available)... I was thinking of upgrading them with a cople of Seymour Duncans. For the bridge: Quarter Pound Jazz Bass Pickup For the neck: Hot Jazz Bass Pickup A few questions: Will this have a serious impact on the type of sound my bass makes? Will they be hard to install? Can I install two different inds of pickups like this? And are they sold as singles? Oh yeah, and what do you think?