Assuming there is a perfect degree of structure for supporting the tension of the strings and yet offering ideal response etc., this structure is part top and part braces. More top means Less brace, more brace allows (demands) more top. If the structure is in the top, the frequency of the braces (number) can be less because the top is better able to bridge the gap between the braces, and then on the other hand, more braces are required if the top is thin, but they do not have to be as robust. It has been shown that the more the structure is carried in the top, the more the necessary assembly weighs.
THEREFORE: Assuming perfect structure, a 5 brace top would have less quick response, more sustain, and a satisfying but less open tone.
CAVEAT: No two makers are likely to fully agree about “perfect structure”, thus the assumption is not valid.
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