The bass reinforcement systems TT12, TT12SP, TT15, TT15SP, TT18K and TT18KSP extend the bass transmission range of our TS-series speakers by more than one octave. Depending on the case of application and the required maximum level three different version are offered. Beginning with compact 12 and 15-inch bass reflex systems to the high power subwoofer with 18-inch long throw driver and cardioid technology harmonise technically and optically with our mid top cabinets from the TS-series. These systems feature high dynamics and low distortion.