The Mandolin uses a HiVi RT2EA. This driver has a 6db peak between 5k to 10k, goes out to the heavens on the top end on axis after that. 30% off axis, it is very flat to 10K,but rolls @ 18db per octave after 10k. . This speaker will most likely need some distance between them with a 10 to 20 degree tow to sound their best Or with a properly designed notch filter, on axis would be prefered. I've not used this part, but I've used HiVi drivers, overall nice goods. Like any part how it is crossed and compensated is everything. Great Potential.