The simple answer is physics. Though advanced acoustics and digital processing can deliver solid bass, they're no match for bigger speaker drivers. The larger drivers inside dedicated subwoofers can physically move more air, which helps recreate the low-frequency waveforms that eventually reach our ears with authenticity and accuracy. A subwoofer is all but necessary if you're looking for powerful explosions, floor-rattling thunder, and rich, low musical performance.

Size is always an important factor when purchasing a soundbar. The first thing to consider is whether your entertainment console is long enough to support your soundbar of choice. Typical soundbars range from 36 to 46 inches or longer, especially for high-performance bars with many drivers, such as those that support Dolby Atmos. Check out our guide to the best TV stands for wide console recommendations. 

You'll also want to ensure your soundbar won't block your TV screen, especially if your TV sits on a stand rather than being mounted on a wall. Most soundbars are designed to sit at a height of three inches or less, but it's best to take some measurements to avoid any issues. 

For the soundbars on this list, you'll also want to ensure you have space for your subwoofer. Subwoofers can range from tall and slender to short and stout, so take some measurements to ensure you have good placement options. Most setups work well with the subwoofer placed on the ground to the left or right of the TV console, but it's best to have some room to experiment.

Finally, if you want a soundbar with separate surround sound (or satellite) speakers, ensure you have stands or shelves that allow you to properly place the speakers slightly behind and to the sides of the main listening position. Dolby offers some helpful speaker configuration guides for this purpose. You'll also want to ensure you have power outlets in reach for wireless surround speakers or long enough cables to plug in wired options comfortably.

Some soundbars offer the option to add a subwoofer or surround sound speakers later on. These are called modular systems, allowing you to buy extra components later.

Some soundbars, including options from Klipsch and Sennheiser, even feature a standard subwoofer output, allowing you to connect a traditional subwoofer from any brand. Others, like the Sonos Arc Ultra and Bose Smart Soundbar, require the purchase of a specific subwoofer made by the same company. Check out our guides to the best Bose soundbars and best Sonos soundbars for subwoofer recommendations specific to those brands.

On the downside, many brands charge a major premium for soundbar models that use modular designs. If you're on a budget and bass is a key factor, we recommend purchasing a soundbar and subwoofer combo from the start to get the best value.