The soundbar should remember the last volume level that it was left on before it was turned off. Whenever i turn my soundbar off, i also have this soundbar (Samsung HW-K550), and whatever the last volume that it was left on, for example if i turn it off at 14 volume, when I turn it back on, it automatically starts off at 14, since that's what volume was at when it was turned off. This might differ depending on what T.V brand you are using and the way the soundbar is connected to the T.V. I'm using a Samsung T.V and it connects using Samsung Sound Connect.