My kid brother has a 1958 Martin D-18, and, it is probably the loudest acoustic guitar I have ever heard. He has had many chances to sell it to well known bluegrass pickers. One of them was that jumping jack with the Lewis family. Cant recall his name. Another who loves it, Charlie Waller, Country Gentlemen.

My pal, Smokey Green, has an old D-21 that will blow the socks off most other guitars.