LD Systems Stinger Sub 15A G3, Active Subwoofer, Active bass reflex subwoofer with 1x 15"" speaker, Integrated Class-D power amp, Power: 450 W RMS, 900 W Peak, Max. SPL (sound pressure level): 133 dB, Frequency range: 40 - 200 Hz, Integrated DSP with the following protected circuit designs: limiter,