3.5" Auto Speaker (400-1325A) Specifications Faxback Doc. # 7026 Impedance:..........................................................8 ohms Frequency response:..........................................170-10,000 Hz Free air resonance:.................................................170 Hz Efficiency (SPL at 1 watt, 1 meter)..................................87 dB Nominal power:........................................................10 W Maximum power:........................................................20 W Magnet weight:................................................5 oz (142 g) Speaker weight:............................................13.8 oz (390 g) (smc-02/23/94)