A good question, but I would like to take it a step further - how relative to tone is bridge mass in general? Does some mass actually add to the tone? what if you could make a bridge that had the structural integrity needed, but has no mass, how would that affect tone?
There is a noted difference between Ebony and Rosewood bridges, with Rosewood being a bit lighter. If mass is a hindrance to tone, why not hollow out, or otherwise lighten the bridge?
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---Tom H ---
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