Bose AM-01 Acoustimass Bass Charger Series I and Series II Tech 22/02/2014 Audio Bose AM-01 Acoustimass Bass Charger Inside The Bose AM-01 internal design is similar to the Bose 501Z, plus the amplifier section. 60W Power Output 150Hz Crossover Frequency Bose AM-01 Acoustimass Bass Charger Series I Bose AM-01 Acoustimass Bass Charger Series II Bose AM-01 Acoustimass Bass Charger Series I versus Series II