Does anybody have any information on Bose acousticmass AM15 II and AM16?

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I plan to buy 2nd hand or old Bose acousticmass AM15 II /AM16 and want to mod the power supply unit. as I know some acousticmass series using SMPS that difficult to mod. but AM15 first issue they used the transformer, very easy to change the cable jumper inside to convert 120V to 220V or 220V to 120V.

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Thank you
 
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