With honorable exceptions, audio is often the "poor little brother" in relation to video and almost the same could be true of home theater systems. Big mistake. Spending too much money on a 4K screen and not investing enough in sound is already limiting your viewing experience in half.
Good home theater fans have it clear and know the real wonders of home theater systems, starting with soundproof dedicated rooms, ergonomic seats, quality cables and of course, hardware calibrated TVs, projectors, amplifiers, A/V receivers and high-quality speakers. This is outside the scope of this article but if you’re interested there is a wealth of information on the Internet.