JBL SRX828SP, Active 2x 18"" Subwoofer, With DSP and App-Control, Ideal bass supplement for the SRX812P, SRX815P and SRX835P, Speakers: 2x 18"" DCD subwoofers (3"" coil), Amplifier wattage: 2000, Maximum performance, high reliability and low power consumption, Fast SHARC DSP, Extensive possibilities for signal adjustments, LCD display for easy operation, Regulation and control via network and app for Android and iOS, Scratch and impact resistant Duraflex lacquer, Attachments for casters included on rear side, Lockable socket for power cable, Frequency range: 29 Hz -150 Hz (-10 dB), Max. SPL: 141 dB, 20 Parametric EQs, Max. 2 seconds delay, 50 User settings, Dimensions (H x W x D): 574 x 1,205 x 681 mm, Weight: 65.9 kg