The Augspurger Duo 12MF-Sub218-DSP3/2500 is a two-way main monitor cabinet loaded with two 12" LF drivers and one 4" high compression driver with beryllium diaphragm on an Malekpour-designed rock maple "MF" (Midfield) horn. The Duo 12MF-Sub218-DSP3/2500 configuration includes two S218-D18 subwoofer cabinets with two 18" sub drivers each.