Hello there and welcome.
This a good question.. You might want to also ask [email protected]
I have both 2piece and 1 piece backed fiddles and only difference I can tell is in the makers craftsmanship. Even looking here you will find fine violins with both.
I hope we can both get a better answer.. Have a great day.
With violins there is no fretting over the music.
Good question, all the research I have done on this subject there seems to be very little if any difference in a one piece and a two piece back. Some folks think the two piece back is a bit more stable, others do not. It does takes a much larger tree to make a one piece back compared to a two piece. It seems all the makers for the last 300+ years have used both one piece and two piece backs with great success. I'm sure its a debate that will be renewed with each new generation of fiddlers.
Master the Frog and you have mastered the bow.