The THE15 Be PRO ACTIVE EXT ON WALL requires a high quality powerful 2ch DSP controlled amplifier. The 15 Be PRO ACTIVE EXT ON WALL is an extremely impressive and extraordinary performing musical speaker system, that leaves nothing to be desired. This 15"point source axisymmetric speaker has been designed as screen speaker for large theaters as left, center and right speaker or can be used for very large theaters as a surround speaker.