HERTZ SP 4.900HERTZ (SP 4. 900) 250WX4 RMS @ 2 OHMS 4 CHANNEL MOTORCYCLE AMPLIFIER ADVANCED HD CLASS FEATURES: Up to 85% efficiency thanks to ADC (Advanced D Class) output stage USS (Universal Speakers Simulators) allows SP 4. 900 to work with head units featuring the speaker load detection circuit 160 x 4 (4) with ultra compact size (211,6 x 130 mm) IP55 aluminum chassis for maximum protection against humidity and external agents No cooling fan to prevent internal
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