According to our information, the base of the product mentioned is not compatible with the OLED C4 48". These are different mounting systems.

The compatibility of the base of the soundbar with an OLED C4 48" is not explicitly confirmed. The LG Soundbar SC9S is specifically designed for the 55", 65" and 77" OLED evo C2, C3 and C4 models to provide an optimal sound experience. There is no specific information on whether the base of the DSC9S soundbar is compatible with a 48" OLED C4 model. You could contact LG customer service for more detailed information.