Rated Impedance: 8 Ω  ± 15% at  400  Hz
Rated Power: 40 W
Max. Power: 80 W
Sensitivity: 88 dB ± 3dB , 1W/1M
Frequency Range: 50 Hz ~ 20KHz   -10dB / ±20% Hz
Resonance Frequency: 65 Hz ±20%
Whistling : 9 Volts 
Membrane: Fiber cone and rubber surround
Baffle: ABS / White
Mesh Grille: Steel / White
Dimension: 299 ^L x 214 ^W x 84 ^H mm
Weight: 1.8 kgs