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Thank you for contacting Sony, Mala. The BRAVIA 7II uses speakers positioned on the sides of the frame to project audio forward into the room. A Sony OLED vibrates the actual screen so the sound comes directly from the display itself. Both deliver immersive home theater audio using different technologies. We appreciate your interest in Sony products. Should you require any further assistance, please don't hesitate to reach out for support here: https://us.esupport.sony.com/support/s/support-contact?language=en_US&category=tv Best regards, Gus, Sony North America Customer Support
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