SkyTec MAX15SUB Subwoofer Complete Set, 1500 Watt Peak, 2 x 15 Inch Woofers, 1 x Amplifier, Speaker Cable, Woofer, Bass Boxes for Integration into a Sound System, Sound Boxes : Amazon.de: Musical Instruments & DJ
Skytec SPSL15 Chassis Speaker 800W 15" - cheap at LTT
SkyTec SMWBA15 Bi-amplifier subwoofer 15 "600W
Skytec SWA15 active subwoofer + Ibiza 15" active outside test - YouTube