Shark SHKMRC3090DBC 250w Motorcycle/Snowmobile Audio System with 3" Speakers (Chrome) powerful 2ch motorcycle amplifier with 2 waterproof speakers, FM receiver, brackets for install Channel separation &gt;45dB Frequency response 20Hz-50kHz Sensitivity 50mv Frequency range 87.5--108MHz Dot Matrix LCD FM frequency display Usable sensitivity 5 v at S/N 26dB Fuse rating 5A Details for loudspeaker Working Voltage 10-16V DC VoiceCoil Impedance: 4 Resonc Frequency: 165HZ Effective Frequency Range: Fo-12kHZ Puiput Sound Pressure Level: 88dB Working Voltage 10-16V DC MAX power @ 4 50WX2 +150w RMS power @ 4 25WX2+65w THD 75dB