Bose 501AR-II Tech 22/02/2014 Audio, Auto Bose 501AR-II one of the few after-market audio solutions made by Bose. It was released in July 1992, by Bose Mobile Music Systems division. Comes with equaliser and satellites for automotive installation. Bose 501AR-II Specifications 165 W Peak Power Handling 48 Hz ~ 20 kHz Freq Response 150 Hz Cross Over Freq 4 ohm Nominal Impedance Related products articles: Bose AMA-03 Acoustimass Automotive Bass Charger