Hi , I'm interested in what I perceive are the two different Fender Jazz Bass sounds . To my ears the 70's jazz basses have a certain sound in comparison to say the 60's reissues and a Lakland J O I recently aquired. The 70's jazz basses seem have 'that' certain 'classic' type slap sound ie pretty Marcus Miller in character , the sound does obviously change a bit due to the board wood (maple or rosewood) , but the general characteristic of the sound I'm talking about seems to be 'belong' to a lot of these 70's Jazz basses . Now when listening the 60's reissue and the Lakland J O the slap sound is of a different character , not quite as 'scooped' and had more of an upper mid metallic sound to it and not quite as transparrent . The body wood's on the 70's basses I mention are of the typical heavy type used then , I'm not sure what type . The 60's models I talk about have alder bodies , also the fret wire is different . What I'm interested in is the determining main factor that give these basses their individual sounds . Perhaps the pickups ......?