Here you can see and hear a
Kerman guitar at Dream Guitars which seems to be constructed in the same way like his mandolins. The description from Dream Guitars gives some more insight how we could imagine these instruments from inside. The second top seems to be similar to Brian Deanīs second back construction with the difference that it has a sound hole that connects the inner sound chamber (formed by the two tops and the inner sides on upper bout) with the surrounding chamber, thatīs formed by the back of the guitar and the outer sides on the upper bout plus these ports beside the actual top. The question is if the second back acts more as a back or a top (generating tone) or, like said earlier, a big virzi (whatever a virzi does) or everything at the same time.
The guitars back is flat, as usual for a classical guitar, but the mandolins back is arched. Would be interesting to know why and if itīs carved or bent.
From Dream Guitars:
"It incorporates a floating back with small, light braces and smaller internal upper bout area, imagine a guitars inside a guitar. This gives a focused and powerful sound with excellent projection. The carved upper bout edges act as additional sound hole area."
(images and videos deleted)
In this video Jacob Reuven is talking a bit about his mandolin. Unfortunately, like Avi, he doesnīt go very much into detail about construction, they are clearly more into playing their instruments than analysing them and comparing them to others. Maybe not the baddest attitude.
Heīs also talking about a "little mandolin inside the mandolin".
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