I was noodling a little today on my Essence and turned to my Collings City Limits arch top guitar. Rather than plugging into my usual amp for it's use, a Schertler UNICO ( which I really like because it is so devoid of coloration); I plugged into my PJB Roadcase. Wow, the tone was sooo warm/fat/thick with the EQ flat. Loved it! I don't know yet how it would sound with other acoustic/ electric guitars, but I may experiment some. I love this amp.