15-SRX10S4 - Memphis 10" 200W RMS Single 4-Ohm Street Reference Series Subwoofer 15-SRX10S4 - Memphis 10" 200W RMS Single 4-Ohm Street Reference Series Subwoofer RMS / Peak (w): 200 / 400 Sensitivity (dB): 84 Injection molded polypropylene cone Mounting Depth (in): 4.57"