Sound problem with Dell Inspiron 3558

Hi-I'm having problems with the sound levels on my laptop. Although I have it set at 100%, in order to hear the sound in a movie, I have to hold it in my lap with the speakers facing up towards me-not good if someone else also wants to watch. I've tried everything that I've found online to fix this problem. A lot of the suggestions say to go to the enhancements tab under speakes, but I don't have an enhancement tab on that page. All I have is General, Levels, Advanced, and Spatial Sound. Does this model not have the enhancemet tab? If not, is there a way to increase the sound level (something not too difficult-I'm not a computer expert). The sound used to be fine, but in the last couple of months, something changed (maybe an automated update or another update?) I use the computer for my job writing and for browsing and watching movies and tv - nothing that would require me to make any changes. Anyway, is anyone has an answer to this problem, thanks in advance.