How to buy a soundbar

These days, even the cheapest televisions are rocking pristine, high-definition screens. You can sort through Amazon’s bargain bin, pinching pennies like Scrooge McDuck, and still come away with something detailed enough to make out the individual hairs on a spider’s leg. But in the age of 4K Ultra HD and HDR, there’s still one aspect where modern TVs don’t cut it: Sound. It’s no surprise that wallpaper-thin screens don’t have room for top-tier speakers, but what’s the best solution? The most popular option is a soundbar.

Soundbars are slim, unobtrusive, and easy to set up, and the best soundbars can effectively emulate a full-featured surround sound system (for less dough and less effort). But figuring out which soundbar to choose can be difficult, given the diversity of options and the confusing numerical suffixes attached.

Digital Trends is here to help, and our soundbar buying guide will tell you what you need to know when shopping for one.


Regardless of which soundbar you choose, it’ll be a major improvement over the internal speakers of just about any television. Still, there are decisions to be made, and the first one is extra important: Should you get a soundbar with a subwoofer, or without one?

Bill Roberson/Digital Trends

Bill Roberson/Digital Trends

Subwoofers are speaker drivers dedicated to the reproduction of low-frequency audio — think rumbling bass, exploding bombs, the whump-whump of a helicopter’s blades. A soundbar with a subwoofer will add punch and rumble to TV shows and movies, creating a fuller sound and more effectively projecting audio throughout the room. If you plan on watching lots of action movies or movies with epic music, you’ll likely want a subwoofer.

Some soundbars come with dedicated subwoofers (most connect wirelessly, though some require a direct-wired connection), but in some cases, you’re better off purchasing them separately. Make sure to do some research — our Best Subwoofers guide is one resource. If you decide to buy a third-party dedicated subwoofer, make sure your soundbar supports it — not all soundbars have a dedicated subwoofer output.

In other cases, like the pricey but beautiful Bang and Olufsen Beosound Stage, the subwoofers contained in the soundbar itself are powerful enough to deliver all but the most sofa-shaking low frequencies. Even the Sonos Arc and Bose Soundbar 700 are arguably capable of holding their own sans-subwoofer.

What size soundbar do I need?

Since soundbars come in a variety of shapes and sizes, you need to determine the best size for your TV. Some people prefer that their soundbar is the same width as their television, while others are on the hunt for bigger. It’s a personal preference in the end.


For the most part, you’ll need just one cable to connect a soundbar with your TV. Some soundbars rely on optical cables, which work fine. Still, HDMI is preferred. The HDMI interface supports more audio formats than the optical, which effectively means you’ll get higher quality sound that’s more immersive with HDMI.



Stereo Stereo
 Dolby Digital

Dolby Digital

Dolby Digital Plus
Dolby Atmos
Dolby True HD

But HDMI connections aren’t all equal, especially when it comes to soundbars. To connect a soundbar to a TV over HDMI, your TV needs to support HDMI ARC (Audio Return Channel) or HDMI eARC — some older TVs don’t have this feature. If your TV doesn’t have it, you’ll need to stick with an optical connection.

Keep in mind, if you connect your soundbar via HDMI, you’ve now got one less HDMI port on your TV for devices like streaming media players, Blu-ray players, or cable boxes. To compensate, some soundbars offer an HDMI input, and some offer more than one, which effectively turns them into mini A/V receivers. But some soundbars, like the Sonos Arc, don’t have any HDMI  inputs. If you’re already running low on HDMI ports, that’s something to keep in mind.

The only solution (other than buying a soundbar with multiple HDMI inputs) is to buy an HDMI switch, which can turn one HDMI port into two, three, four, or more — but this increases the complexity of your setup, something which a soundbar is meant to prevent.

Channels and Dolby Atmos


When shopping for soundbars for your home theater, you’ll probably come across some confusing numbers. Labels like “2.0,” “3.1,” or “5.1” are there to let you know A) how many channels a soundbar has and B) whether or not it has a subwoofer.

The first number (before the period) refers to the number of channels, and the number after the period tells you whether there’s a subwoofer (1) or not (0). If a soundbar has only two channels, that means a left and a right channel. If it has three channels, the third is a center channel, which improves dialog clarity. Five adds channels for rear or surround sound speakers.

Often, a soundbar system will come with a wireless subwoofer or separate subwoofer and, in some cases, even wireless satellite speakers. These don’t need to connect physically with the soundbar itself, but they’ll need a power source, so you’ll have to position them near wall outlets (or get creative).

But here’s where it can get a little tricky: A soundbar can claim to be 2.1, 3.1. or even 5.1  — even if it doesn’t come with a subwoofer. As long as the soundbar has dedicated low-frequency drivers (like the Beosound Stage), it can still claim “.1” status.

If there’s a third number — i.e., 5.1.4 — that means the soundbar supports discrete Dolby Atmos surround sound and/or DTS:X. The final number refers to the number of dedicated drivers that fire upwards at the ceiling, bouncing sound down to create an enveloping effect. Early Dolby Atmos models were reasonably effective at simulating dedicated height-channel speakers, but the newest Atmos soundbars are incredible. Atmos is the most popular surround sound technology, capable of processing 128 distinct objects in a given scene.

But wait, why do I see some soundbars claiming to offer Dolby Atmos sound, yet with as few as two channels? This is the curious thing about Dolby Atmos. It can be reproduced using dedicated drivers within a single speaker (e.g., Sonos Arc), or it can be reproduced using separate speakers (e.g., Vizio SB36514-G6), or it can be reproduced “virtually” using as few as two channels in a single speaker.

Naturally, there’s a wide range of quality in these situations. We’d argue that if you’re a Dolby Atmos fanatic, there’s simply no substitute for dedicated speakers placed correctly around your room. However, it’s remarkable just how good virtualized Atmos can be — Sennheiser’s Ambeo is a great example.

Whole-home audio and Bluetooth

Soundbars are increasingly being used for listening to music as much as for listening to your TV. This is especially true in smaller houses or condos. Most new soundbars support Bluetooth connectivity and streaming from your smartphone, tablet, or computer, making for a quick and easy to hear your Spotify or other music on a bigger speaker. However, more sophisticated options exist.

Sonos, Denon HEOS, Bluesound, Go to Source