Loudest guitar I have ever played, hands down and absolutely no comparison, is my spruce/mahogany S18 12+6 harp guitar, which probably has at least half again the top surface area and air volume of any normal guitar. It absolutely fills a large room, and my left ear rings a bit after I play it if I keep my ear too close to the second sound hole. Number 2 on the list is my S12, which is 6+6. The presence of the harp strings complicates the comparison, but I don't see how they would add volume to the guitars - they certainly reverberation.
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'17 Tonedevil S-18 harp guitar
'16 Tonedevil S-12 harp guitar
'79 Fender Stratocaster hardtail with righteous new Warmoth neck
'82 Fender Musicmaster bass
'15 Breedlove Premier OF mandolin
Marshall JVM210c amp plus a bunch of stompboxes and misc. gear
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