How to improve sound on Harman Kardon Onyx Studio 8 and 7 - Harman Kardon SECRET CODE(IT WORKS!!!)

How to improve sound on Harman Kardon Onyx Studio 8 and 7 (IT WORKS!!!)
Adjust Bass on Harman Kardon Onyx Studio 8 and 7
Harman Kardon SECRET CODE (IT WORKS!!!)
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