sound audio exciter 1,multiband sound enhancer,exciter 2,provide subjective loudening 3,bass punch,presence transpare Multiband Sound Processor,sound audio exciterFeatures:,The BL230 ... is a very versatile multi-band sound enhancer/ exciterfor all ... ,22Hz-22KhzFilter Distortion0.008%@+4tue,1Khz sound audio exciter