The size of your living room or home theater plays a big part in what kind of system you should consider purchasing. A good surround sound system needs to be powerful enough to fill your room with crisp, clear sound. If you get one that doesn’t have enough horsepower, it can distort when playing at higher volumes.

THX has created “room size categories” to help you find the right products to accurately reproduce movies, music and video games in your home. THX Select Certified loudspeakers are designed for medium sized rooms 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen. THX Ultra Certified loudspeakers bring the cinematic experience to large home theaters, 3,000 cubic feet with a 12 foot or greater viewing distance from the screen. THX Certified Dominus products are for expansive home theaters spaces, 6,500 cubic feet in size, with a 20-foot viewing distance from screen.