Key takeaways
- Bar width between 70 and 100 percent of your TV's screen width looks proportional and avoids stand overhang.
- Channel count above 5.1 only pays off once the room is large enough for phantom rear imaging to sound thin.
- Optical cable cannot carry Dolby Atmos or DTS:X at all, regardless of how capable the soundbar is.
- A dedicated subwoofer earns its space once you are regularly watching content with low frequency effects at a real volume.
- Price above roughly 300 USD buys calibration and height channels, not a guaranteed jump in everyday dialogue clarity.
You are standing in front of a wall of soundbars, or scrolling through them at midnight, and they all promise the same thing: better sound than the two thin speakers hiding in your television’s chassis. Almost all of them deliver on that promise. What actually decides whether you are happy with the choice in six months is whether the bar matches your television, your room, and how you watch things.
I have installed enough of these to know the return desk sees the same three complaints on repeat: the bar looks wrong next to the TV, dialogue gets lost under explosions, and the box promised Dolby Atmos that the living room never quite delivers. Every one of those is a matching problem, not a defective unit.
One customer in a one bedroom flat bought a flagship 7.1.4 bar for a room barely 14 square metres and called me afterward asking why it did not sound noticeably bigger than his old one. Channel count was never the problem there. Room size was, and no amount of extra height channels changes that arithmetic.
Matching bar width to your television
Start with the television, not the soundbar. A bar much narrower than the screen looks like an afterthought sitting on the stand, and one that overhangs a narrow shelf becomes a hazard the first time someone brushes past it.
The working range most installers use is 70 to 100 percent of the TV’s screen width, measured corner to corner along the base rather than the diagonal printed on the box. A 55 inch TV, about 121 cm wide, suits a bar somewhere between 85 and 121 cm. A 65 inch TV, about 143 cm wide, wants something closer to 100 to 143 cm.
Stand depth matters just as much as width, and it gets missed far more often. A bar deeper than about 12 cm can block the TV’s front facing infrared sensor or leave no room for cables on a shallow shelf. On a shelf around 15 cm deep, that leaves very little budget once a cable channel at the back is accounted for, which is exactly why measuring the shelf before ordering saves a return shipment later.
For the full arithmetic worked through on real rooms rather than averages, see how soundbar and TV size actually interact.
How many channels you actually need
The numbers on the box, 2.1, 5.1, 7.1.2, describe how many discrete channels the bar can decode and route, not how loud it gets. The first number is the count of main horizontal channels. The number after the first decimal point is subwoofers. Any number after a second decimal point counts height channels for Atmos or DTS:X.
A 2.1 or 3.1 bar suits a small bedroom or a casual living room where dialogue clarity matters more than surround imaging. A 5.1 setup, especially paired with real wireless rear speakers, changes how convincingly a rainstorm or a car passing behind you sounds. Going further, to 7.1.2 or 7.1.4, only pays off once the room is large enough that phantom rear imaging from a 5.1 bar starts to sound thin.
The full breakdown of what each configuration changes in practice, including the mistake that wastes people’s money most often, lives in this explainer on channel counts.
Of every change on this list, moving from a basic 2.1 setup to a genuine 5.1 layout in a living room of roughly 25 square metres has produced the biggest jump in reported satisfaction among installs I have done, more than switching brands or paying double for a flagship model.
Whether a subwoofer earns its floor space
Most bars under about 400 USD include a small forward or side firing woofer that handles bass down to roughly 60 to 80 Hz. Below that, a dedicated subwoofer with an 8 to 10 inch driver is doing work the bar’s own driver physically cannot.
If you live somewhere with shared walls, or your room is under about 15 square metres, a wireless sub might be more bass than you can comfortably use anyway. If you watch a lot of action films or play open world games at real volume, the difference stops being subtle fast.
Sit through one loud action scene at your normal volume before deciding either way. If the low frequency rumble of an explosion feels thin rather than felt in the chest, that is exactly the gap a dedicated subwoofer closes.
A full walkthrough of the conditions that flip this decision is in whether a subwoofer is actually worth adding.
Renters in older buildings should also weigh what the structure itself can tolerate. A timber framed duplex transmits bass through joists far more readily than a concrete high rise, so a subwoofer setting that is unremarkable in one building becomes a genuine complaint from the flat below in another.
What your HDMI connection can actually carry
This is where most Atmos disappointment starts, and it has nothing to do with the soundbar itself. Optical, also called TOSLINK, cannot carry Dolby Atmos or DTS:X at all. It tops out at Dolby Digital 5.1 or DTS 5.1, regardless of how good the bar is.
HDMI ARC can carry Dolby Digital Plus, which is exactly how Netflix, Disney Plus, and most other streaming Atmos arrives. HDMI eARC adds the bandwidth for lossless Dolby TrueHD and DTS-HD Master Audio, the formats used on 4K Blu-ray discs. If your TV only has ARC, streaming Atmos still works fine. Disc based lossless Atmos will not.
One setting trips up more installs than any spec sheet: whether your TV is set to bitstream, sometimes labelled passthrough, or to PCM. PCM means the TV has already decoded the audio itself, which strips out the object based metadata Atmos actually needs. For the full connection walkthrough, see setting up eARC correctly.
eARC also needs enough bandwidth to carry lossless multichannel audio, formally defined by the HDMI Licensing Administrator’s own specification. In practice, most HDMI cables sold in the last several years already meet it, and the simpler test is whether a 4K Blu-ray plays its Atmos track without dropouts rather than checking a cable’s printed rating.
Soundbar or AV receiver: when a bar stops being enough
A soundbar is a compromise by design, one enclosure standing in for five, seven, or nine separate speakers and an amplifier. For most living rooms that compromise is the right one. Setup takes twenty minutes, there is one remote, and models like the Sonos Arc Ultra or Samsung HW-Q990D get close enough to a discrete system that most listeners cannot tell the difference from the couch.
Where it stops being enough is a dedicated room built around the screen, where you want real ceiling speakers rather than up firing drivers bouncing off a flat surface, or where you already own a stack of separate speakers worth keeping. An AV receiver such as the Denon AVR-X1800H opens that door, at the cost of more boxes, more cable runs, and a setup afternoon instead of twenty minutes.
The full comparison of what you gain and give up either way is covered in soundbar versus AV receiver.
A receiver also earns its keep once more than one source is fighting for a connection, a games console, a disc player, and a streaming box all wanting HDMI at once, since most bars offer only one or two passthrough ports compared with a receiver’s six or more.
Budget tiers and what changes at each one
Price in this category buys three things, roughly in order: bass extension, channel count, and calibration smarts. Below about 150 USD you are mainly buying a clarity upgrade over TV speakers.
| Price range | What you get | What you do not |
|---|---|---|
| Under 150 USD | Clearer dialogue, basic stereo or 2.1 sound | Real surround, deep bass, Atmos decoding |
| 150 to 300 USD | 3.1 or 5.1 channels, a small wireless sub, Dolby Digital Plus | True height channels, room calibration |
| 300 to 600 USD | 5.1.2 or 7.1.2 with up firing drivers, eARC, app based EQ | The imaging precision of discrete ceiling speakers |
| Above 600 USD | Room calibration microphones, larger subs, models like the LG S95TR or Sony Bravia Theater Bar 9 | Diminishing returns per dollar past this point |
What crossing each threshold actually buys, model by model, is broken down in what you actually get above 300 dollars.
I have measured flagship bars and 300 USD bars in the same room with a calibrated microphone, and the gap in frequency response above that price point is real but narrower than the price difference suggests. Past 600 USD, most of what you are paying for is convenience: automatic room correction instead of manual guesswork, not a guaranteed leap in raw sound quality.
Once width, channels, subwoofer need, and connection type are matched to your room, the remaining differences between similarly priced bars are mostly about how their EQ presets sound to your own ear. That is worth an evening with the remote, not another spec sheet.
Questions readers ask about this
Not automatically. Price mostly buys bass extension, channel count, and calibration smarts rather than a flat quality jump. A 200 USD bar with a well matched subwoofer can sound more balanced in a small room than a 700 USD model with height channels it has no ceiling to bounce off. Match the spec to the room before the price tag.
Yes, but check the width again. A bar sized for a 121 cm wide 55 inch screen will often look undersized under a 143 cm wide 65 inch screen, even though the sound itself has not changed. It is a visual mismatch more than an audio one, so it comes down to whether that bothers you.
Not really. Atmos earns its keep on films and shows mixed with height effects, rain, aircraft, crowd noise overhead. Dialogue heavy content leans on center channel clarity far more than on ceiling bounce, so a 3.1 or 5.1 bar without height channels serves that viewing habit just as well for less money.
Sometimes. A separate unit like an SVS SB-1000 Pro paired with a mid range bar can outperform a bundled system's subwoofer, since the bar maker often treats the included sub as an afterthought. The trade off is two remotes, two power cables, and no guarantee the crossover between them is tuned as well as a matched bundle.
Five to eight years is typical if nothing fails physically. Firmware support tends to end sooner than the hardware does, particularly for HDMI and app features, so a bar can keep making sound years after its manufacturer stops updating it. Failing capacitors or a dead wireless sub connection, not worn out speakers, are the usual reasons people replace one early.
About the author
Rahul Gupta
Rahul Gupta has spent nearly a decade quietly wiring living rooms, testing soundbars in every awkward apartment layout imaginable, and untangling the kind of HDMI handshake problems that make people give up on Atmos altogether. He writes here about what actually works when you get the boxes home—not what the spec sheet promises. If a piece of gear on this site earns a recommendation, it earned it in a real room with real furniture, not a lab.
