I can't say that shielded wire would be needed in a shielded cavity, except for running through places that are hard to shield with copper foil (like the holes leading to the pickups). But there are quite a few pickup makers that provide shielded wire leads on their pickups. So when I do install those I guess I'm using shielded wire.
Those that don't (the SD QP's I installed in my Warmoth didn't come shielded) I shield the pickup route and control cavity with foil like normal. Then take the braid out of a length of RG-6/58/59 coax and run that through the hole between the pickup the control cavity. (strip all the insulation off the 6" or so piece of RG-6/58/59 without damaging the braid, then work inwards much like removing a chinese finger trap and you should end up with just a braided tube). Then fan out the ends of the braid and solder that to the copper foil on both ends. Finally running the wire through that.
I know that probably sounds harder than just swapping out the normal leads for shielded ones on the pickup, but this method stays with the bass and removes the need for an extra wire to tie the shields together, works with shielded or unshielded wires on pickups you might want to try in the future, and doesn't void any warranty the pickups might have by altering them.
On a completely different note, I do love using that cloth braid covered wire. Its a pain to strip sometimes, but it always makes a control cavity look 'finished'.
Those that don't (the SD QP's I installed in my Warmoth didn't come shielded) I shield the pickup route and control cavity with foil like normal. Then take the braid out of a length of RG-6/58/59 coax and run that through the hole between the pickup the control cavity. (strip all the insulation off the 6" or so piece of RG-6/58/59 without damaging the braid, then work inwards much like removing a chinese finger trap and you should end up with just a braided tube). Then fan out the ends of the braid and solder that to the copper foil on both ends. Finally running the wire through that.
I know that probably sounds harder than just swapping out the normal leads for shielded ones on the pickup, but this method stays with the bass and removes the need for an extra wire to tie the shields together, works with shielded or unshielded wires on pickups you might want to try in the future, and doesn't void any warranty the pickups might have by altering them.
On a completely different note, I do love using that cloth braid covered wire. Its a pain to strip sometimes, but it always makes a control cavity look 'finished'.