Sound Post

Why does my A string sound weird on my cello?

When I play open A, sometimes it sounds terrible. I'm not sure how to describe it--it sounds "twangy" or kind of screechy, instead of nice and "flat". The brand of the all my strings is Helicore. The other strings sound fine, just the A. This becomes a problem when I play the Prelude to the Suite No.1 by Bach as there are many times I have to play open A.

I changed the strings in April 2012 by the way.

Is the sound post secure and in the right place? I didn't realized sound post had fallen out of place until after I replace my A string 2 times from hearing the twangy buzzing sound!

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