I have a Scarlett 4i4 Audio interface and I would like to plug my Acoustic guitar in one of the two back side lines (and keep free the two in front for two mics), I have understood that I need first to plug my guitar to a Direct Box to lower the impedance, and then connect the Direct Box to the back side lines.
So now I should choose a Direct Box, and I would like to know what kind of box I should actually choose. As I see the two back side lines (lines 3-4) of the Scarlett 4i4 has an input impedance of 44Ω, and the most of the boxes has an output impedance of ca. 600Ω. Will it work? Or what should I choose for fix the problem?