A popular way to experience really good sound quality from today's HD video broadcasts is with a soundbar. Unfortunately these things are not particularly attractive so this cabinet's purpose is to hide the soundbar away when not in use.
The mechanism was designed and made to do this using a pair of simple gear trains. To deploy the soundbar the drawer front is lifted and pushed inwards. As you do this, the shelf holding the soundbar is pushed forwards. Pushing it back in again closes the drawer.