[quote name='geoffbyrne' post='1336176' date='Aug 11 2011, 10:11 AM']Being that the strings are looser, it's fairly obvious that the amplitude of the vibrating string will be greater, so I don't see anyway of avoiding buzz & rattle when tuning down.
If you want to play at those pitches you would need to use heavier strings which need greater tension even at those tunings and won't rattle.
If you are tuned to BEAD you'll need a 125 or 130 for the B and the others commensurate with that.
When I had this kind of need, I had 2 basses with me, one in BEAD & the other in EADG. That covered everything.
G.[/quote]
This ^
Get a dedicated bass and string it accordingly