Tracking bass that's tuned very low.

[Han]

Some metalbands tune in D or C or even B because they want that roaring and rumbling low. For guitars one could use thick strings and for bass the best solution is a set of strings for a five string bass and use the four thickest strings on a regular four string.

When you do that the bass strings won't rattle, no need to say you need somene who can really play.

 

[7string]

Most bands that tune down to those lower scales also use larger gauge strings to compensate.