6% is great for building,but how it got there is the most important element.The slower,the better.I have nothing against kiln drying if done properly, and then finished up by air drying.When wood is dried too fast,it can get internal fractures that can't always be seen on the outside,and can finish cracking down the road as the wood moves around from different environments it will encounter through it's lifetime.That is why i prefer air dried over kiln.I also believe slower air dried wood to have better tone as well because it is kinder to the fibers within the wood that transfer sound.When those fibers are dried too fast,they break up somewhat and don't transfer vibration or sound as well.Just my 2 cents on the subject.
