USA Made B&K LTD ST3140 Power Amplifier & Reference 50 S2 7 Channel A/V System Preamp Controller Processor.  Both units are in very good condition and the original working remote is included.  Both units have been tested to the best of my ability.  Offering returns for up to 60 days so that the buyer has plenty of time to verify the working condition of the system.  Link To ST3140 Power Amplifier User Manual:  https://manualzz.com/doc/1047572/bandk-st3140-owner-s-manualLink To Reference 50 S2:  https://manualzz.com/doc/en//bandk-reference-50-owner-s-manual