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I was nosing around the internet and saw this article. It's pretty neat and has .wav files at the end for your own listening ear. The study concludes that the position of the soundpost relative to the Treble foot of the bridge is significant, suggesting to me that quickly made, mass produced violins which are set up poorly may suffer from correctable sound post misplacement, only off my several millimeters! Hope for inexpensive violin owners everywhere! I know this may seem obvious to veterans but the article helped me understand more about the violin physics.
Mt. Fiddler,,, the sound post AKA the soul of the violin may be the most critical adjustment of a violin. It may only take 1/2 - 1 mm to make a noticeable difference in the quality of the sound. Also the direction of the grain in the sound post tell's a tale, it should run perpendicular to the grain in the top and bottom or the violin.
I have a $ 90.00 Chinese made violin that I purchased about 7 or 8 year's ago. I tried different type's of string's, they made some difference but not the sound that I was after. I was about ready to dismantle the instrument and make a cigar box violin using the neck, bridge and tailpiece, until I started moving the sound post to different location's. Finally after several move's I got a pretty descent sound out of it.