The IL 112 Sub is a very compact subwoofer, which extends the frequency response of the loudspeakers IL 8.1 and IL 82 in the bass range. It is equipped with a direct loaded 12"-cone loudspeaker in a bass reflexrnhousing and has a built-in passive crossover. The IL 112 Sub stands out through its powerful, low-distortion and thus natural bass reproduction with extremely compact dimensions. It is ideally suitable for acoustic applications in which the bass range of existing loudspeaker systems should be extended for distances of up to 10 m depending on sound pressure requirements. A controller is not required for operating the IL 112 Sub. It is however, possible to use the Digital Field Controllerrn(DFC).