Alan:
I play (poorly!) a 5-String Electric Bass that are very common now. Normal tuning is B E A D G.
The open string 'B0' note of the fattest string on this instrument is 30.85 HZ.
That note is not often played; however, the 5-String Bass can reach way down there...
TAM
I've never had the chance to play a 5-string. I always assumed that the extra string was on top, not on bottom. That's really interesting. So, what's the story on a 6-string? One extra on bottom and one extra on top?
(You can tell I'm a product of the 70s, can't you? If God had meant for basses to have more than 4 strings...)