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Can a Bass VI be tuned to drop c?

If you're referring to a six string bass, yes. I did mine just the other day. My low B became a low G, and I had to back the truss rod off about a quarter turn, but all seems OK. Slightest amount of flop in the B and E string, but tolerable. Certainly wouldn't take her any lower without a heavier guage set.
 
I've read comments from guitarists who claim that they tune 27/28 inch baritones down to a D. Guitarists are more willing to use light gauge, low tension, "floppy" strings than bassists are. When I run a low C on my 34 inch basses I go with 0.125-0.145 strings and I can tell you that the tuners on a Bass VI are unlikely to accept such thick strings. Circle K sells Bass VI sets with up to 0.106 strings and I am guessing that is about as heavy as Bass VI tuners will accept without modification. Is that thick enough for you? If so you can go down to a C. I am hoping to try a Bass VI myself and I intend to try to tune it down to a C but I am willing to go with a higher tuning if need be.
 
The stock low E string on a Bass VI barely works for standard tuning.

As other people have said heavier strings should let you tune lower, but the tuners have guitar-sized posts, so you'll have to be very careful to get the right wrap length so that the full thickness of the string isn't trying to go around that small post.
 
The stock low E string on a Bass VI barely works for standard tuning.

As other people have said heavier strings should let you tune lower, but the tuners have guitar-sized posts, so you'll have to be very careful to get the right wrap length so that the full thickness of the string isn't trying to go around that small post.

Most .105-.130 strings will also have the taper start after about 35". Pretty hard to wrap that kind of diameter around a tuning peg. Not gonna happen with a guitar tuning peg.
 
Most .105-.130 strings will also have the taper start after about 35". Pretty hard to wrap that kind of diameter around a tuning peg. Not gonna happen with a guitar tuning peg.

Bass VI's have a Jazzmaster-style tailpiece, so that might make it possible to find strings that would work.

Still a really bad idea, though.
 
Get a set of the heaviest Bass VI strings available through Circle K string and detune those, or e-mail the owner of Circle K strings directly and check with him. I'm sure the heaviest gauge set can be comfortably detuned to D standard, but I'm not sure if it'll become too floppy at drop-C.