I have see in a music shop of my city a Di Marzio DP 130, I have tried it on my L48 and I must say that it make a incredible wonderfull acoustic sound !!!
It has not altered the beautiful acoustic sound.
Moving it to the bridge tended to produce a blues sound, moving it to the neck tended to produce a jazzy sound but moving it to center the sound is very very acoustic clean, in any case no background noise, wonderful
As mentioned above however, acoustic sound at 100% the microphone remains the best solution.
I have try this Shure SM57 and I say this can to be optimal solution for record the L48 acoustic sound