FOSTEX speaker system BK40H (B) Format: backloaded horn type / use unit: 40mm full-range unit / impedance: 8 Play frequency band: 100Hz ~ 32kHz / output sound pressure level: 78dB / W (1m) / rated input: 2W (maximum input: 6W) Dimensions: 73 (W)  209 (H)  166 (D) mm (1 units)  is not included Terminal / Weight: about 950g (1 units) / Material: MDF Accessories: Speaker Cable (two 1.5m) Japanese manual URL (PDF):http://www.fostex.jp/wp/wp-content/uploads/2015/10/BK40H_Manual.pdf