I'm a builder. I'm working on # 12 currently. Volume has everything to do with cavity size. And the proper sized sound hole. If it were possible to build two guitars of identical woods, bracing, soundboard from the same place, all materials the same. Let's say a parlor and a dread or super Jumbo. I assure you the larger guitar is louder.
There are many details in a build that make a great sounding guitar as well as one with volume and projection. I'm still learning about all those small details.
Comparing two different sized guitars even from the same builder or factory is not an apples to apples comparison. I have a super Jumbo and a Small Jumbo both which I built- the Small Jumbo has more volume. Why? The super is braced too tight. (one of these days I'll reach inside and make some adjustments). The Small has a torrefied top and is braced properly. It is a responsive guitar. The super doesn't sound bad but it does sound different. But it is more quiet than the SJ.
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