When we buy new device such as Sony SRS-RF90RK we often through away most of the documentation but the warranty.
Very often issues with Sony SRS-RF90RK begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Home Theater System Sony SRS-RF90RK is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Home Theater System on our side using links below.