Aluminium Boom Box with Amplifier BX-148 10”Carpeted Speaker Box with Amplifier & USB & SD Jack Magnet: 15oz Voice Coil: 1.25" Foam Edge, Paper Cone Max Power: 400W Frequency Response: 30-20kHz Impedance: 4ohm Sensitivity: 90dB Size: 780x160x330mm BX-109(8") Subwoofer: Double 8" Magnet: 15oz Impedance: 4ohm Voice Coil: 1.25" Cone: Rubber Edge, Injection Cone Max Power: 300W Sensitivity: 90dB Size(mm): 570x330x310 BX-102(10") Subwoofer: 10" Magnet: 30oz Impedance: 4ohm Voice Coil: 2" Cone: Rubber Edge, Injection Cone Max Power:  400W Sensitivity: 90dB Size(mm): 370x355x385