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Double Bass less flat 4th and 6th harmonics?

I have no idea! I just thought that someone cleverer than me might have found a way to do this...

It was just a thought about tuning after alot of struggling with Bottesini's Allegretto Capriccio. I tune the 4th harmonic bang on and forget the rest for this one piece. It works because the e minor tonality comes uot much more clearly like this.
 
You need to understand why the overtones are flat. It's the coupling of the vibration through the bridge pulling the resonant frequency down. So, the only way to get the overtones in tune would be if the instrument made no sound. As has been said, you can pull the string a bit, and playing very close to the bridge also helps.
 
You need to understand why the overtones are flat. It's the coupling of the vibration through the bridge pulling the resonant frequency down. So, the only way to get the overtones in tune would be if the instrument made no sound. As has been said, you can pull the string a bit, and playing very close to the bridge also helps.

Actually, altering the resonant frequency will change the transfer function or "frequency response" but will NOT alter the periodicity. Simply put, the strength of different frequencies can be altered but not the actual frequencies.