In issue 4/99 of German magazine „Akustik Gitarre" you will find a test of an acoustically conceived 18-Inch-Archtop. Meanwhile the 18" model has developed into the J18 Augusta.
Wolfgang Niemann concludes
»If you are looking for a strictly acoustically conceived Archtop the Sonntag is an interesting offer that is worth to be looked at. Produced making use of high-quality woods, variable according to own wishes, optically correct, the Sonntag Archtop is a fair offer. And if one would like to have a pick-up without fail, the master will install one of course.«