1.this speaker is a 1*12" subwoofer speaker 2.full sound,good penetrating,high peformance, 3.frequency ... response: 60Hz-500Hz This speaker is a 1*12" subwoofer speaker specifications:MT1200TYPEDual-driver vented sub-bass systemOperating frequency range60 ... Ω differential between pins 2 and 3Dimensions 530x380x360MMWeight25 kg 1*12"subwoofer speaker