A single layer design of the front emphasizes the clean, simple and minimal front design. An invisible speaker is used to allow concentration on the screen by reducing the appearance of unnecessary elements around the screen. The front speaker is placed at the bottom, and a total of 4 speakers, including a mid-range speaker, produce a quality equivalent to that of the front-oriented speaker, creating a new sensation, because the external speaker shape is invisible. Tempered glass is used for the front filter glass to protect the product and the customer from shock caused by the user mishandling the equipment.