We installed a SP860A and (2) OS2X12 Subwoofers. Head end is a Rolls RM67, DBX 231 EQ, Crown XLS2002 for the SP860 (single channel 350W), and (2) XLS1002 driving each OS2X12 (700W bridged). A Fuhrman power sequencer turns everything on & off the right way. Pair of Shure wireless mics. Used 12/2 wire. Mixer set to mono. I have the EQ & the amps set for 100Hz cut on the speakers for high/lows.
This was a huge upgrade for this gym. Sound is impressive – very clear.