If you are unfortunate enough to have a break-in, the thieves are most likely to look for something easy to steal.
Following an “incident” at my Mother’s house, we were advised that the items that are most often taken are cash, jewellery, mobile phones, laptops and ipads. All relatively small and easy to sell. Top target are bedrooms. The scumbag opened the wardrobes, drawers etc and found nothing. If he/she had bothered to look downstairs they would have found a wodge of cash. Remember, they want a quick in and a quick out.
I really wouldn’t bother insuring hifi; it’s far too big and too much hassle for a thief to steal. On the other hand, guitars are well worth insuring. Everybody knows that a Fender or a Gibson has value.