I think this is an interesting pair of products and an interesting market Mesa has decided to enter.
"The ROSETTE line is a dedicated acoustic instrument platform designed not just for acoustic guitars, but also for mandolin, ukulele, violin/fiddle, dulcimer, cello, upright bass and other uniquely acoustic instruments."
The Grace Design Felix was the first product I had ever seen that could be considered an acoustic instrument platform. The Rosette 300 preamp appears simpler when it comes to turning knobs but has some cool I/O features I have never seen before and certainly not in one place. However, the obvious advantage of the Rosette is it is a complete 300-watt amplifier. The Felix is only a preamp, though, it is one heck of a preamp!
The quote above is rather important. Mesa/Boogie is a guitar amplifier company. I do not know how many dulcimer players who keep tabs on Mesa's product line but I bet the number is not high. As far as I know, there are no dulcimer amplifier companies.The same goes for mandolin, ukelele, and bowed string instruments. Ironically, these are the instruments (and players) that need something like the Rosette 300 far more than acoustic guitarists. The first reason is they do not have any products of this nature marketed towards them. The second reason is they play the few instruments that actually sound good with piezo-electric pickups, which is how most of them are amplified assuming the instrument has them installed. The microphone company DPA has spent a lot of time and energy developing instrument-specific microphones. They are very small and clip onto the instrument. Ultimately, the signal ends up at the end of an XLR cable which is connected to a mixer, PA, or some type of amplification. I suspect Mesa was thinking more along the lines of a singer/guitar player set up, but the idea to add an XLR connection with 48v phantom power was a good one.
I think there a number of problems when piezo pickups are used to amplifier both acoustic and electric guitars. Actually, there is really only one problem: they sound bad. I do not know if it is something that can be fixed either. I like how Mesa is doing their part to make sure the amplifier is the strongest link in the chain though. :lol: