Upgrading sony xe670

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i like to change the output opamp on my sony ( lack of definition , weak bass ) i check on the board and the only 8 pins chip is : 2114, 1018B, jrc, and there a 20 pins : BB DSD1702E , 15ZBNC5
Voltage read : 3.3 , 7 , 5 vlt
 
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