Weekly we all see questions from bass players on TB about downtuning their instruments, so I thought I would start a single thread to act as a resource to current and future users. Tuning a bass lower than the standard EADG, BEADG, or BEADGC is a little bit of a dark art. It is something that bassists do enough to warrant a discussion about it, but not enough to garner a broad discussion with solid procedures for getting it just right. That's where this thread comes in. I want to share some of my successes, frustrations, and failures with trying to bend the rules to make an instrument set up for one tuning, work in another. Feel free to add your tips and tricks as well. What this is not a thread for is the response "Why do you need to tune lower" or things along the lines of "Just use a 5 string if you need a low D or C." Sometimes people need to go lower than E; deal with it. If, by now, you don't understand why a player needs an open D C, B, or anything lower, I don't know if explaining it would be a good use of time. Regardless, if you think your response will be anything close to the two trains of thought above, do everyone a favor, and just don't.