Soundbar guide: channels, Atmos and connections

Soundbar specifications are often described with numbers such as 2.1, 5.1 or 7.1.4. The first number is the count of regular speaker channels, the number after the point is the count of subwoofers, and a third number, where present, counts dedicated height channels used for Dolby Atmos style overhead effects.

Higher channel counts generally mean a larger, more capable, and typically more expensive system, so it is worth matching the configuration to your room and how much you value surround and overhead effects rather than always choosing the highest number available.

The subwoofer handles low frequency bass that a slim soundbar unit typically cannot reproduce well on its own. Many soundbars include a separate, wireless subwoofer unit that can be placed away from the main bar, commonly on the floor near the television or to the side of the room. Placement affects bass response: corners tend to boost bass, sometimes to the point of sounding boomy, while open floor space away from walls often gives a more even result, so some experimentation with position is worthwhile.

Most current soundbars connect to a television using eARC, Enhanced Audio Return Channel, over a single HDMI cable. This carries high quality, multichannel audio, including formats such as Dolby Atmos, from the television back to the soundbar, and it also lets you control the soundbar's volume with the television's own remote in many cases. Both the television and the soundbar need to support eARC, and the television's eARC compatible HDMI port, often specifically labelled, needs to be used for this to work correctly. Older optical digital connections can also carry sound to a soundbar, but they cannot pass the newest, highest quality audio formats.

A soundbar generally performs best placed directly below or above the television, centred on the screen, with a clear path towards the main seating position. Placing it inside an enclosed cabinet or behind a solid barrier can muffle sound, particularly for models relying on upward or sideways firing drivers to create a sense of width or height. If a stand or cabinet is used, check that the soundbar does not block the television's infrared remote sensor.

Wireless surround speakers, where a system includes them, generally work best placed to the sides or slightly behind the main seating position, roughly level with or a little above ear height when seated. Running a short power cable to each surround speaker is usually unavoidable, though the audio connection itself is typically wireless, so planning where a nearby power socket is available is worth doing before deciding on final placement.

An AV receiver paired with separate speakers offers more flexibility than a soundbar, including the ability to add or upgrade individual speakers over time, place true rear surround speakers rather than simulate them, and often support a wider range of connections for other devices. For a room where the best possible surround sound matters and running speaker cable to the sides or rear of the room is practical, a receiver based system usually outperforms a soundbar of similar cost.

A receiver also typically offers more input options, useful for a room with several devices such as a games console, a media player and a separate disc player all needing a connection at once, along with more detailed control over individual speaker levels and room correction. For most households prioritising convenience, a simpler setup and easier installation, a soundbar remains the more practical choice, and modern soundbars have narrowed much of the sound quality gap that used to exist compared with entry level separate systems. See the sound and streaming overview for how these choices fit into a wider setup.

Do I need a separate subwoofer?

Not always, but a dedicated subwoofer noticeably improves bass depth for film soundtracks and music compared with a soundbar alone, which is why most mid range and higher soundbars include one.

Can a soundbar replace true surround speakers?

A soundbar can approximate a wide, surround like sound field through processing and reflected sound, but it does not fully replace dedicated rear speakers placed around the room. For genuine surround placement, a receiver based system with separate speakers is the closer match.

What if my TV does not support eARC?

Most soundbars also offer an optical digital audio input as an alternative, which still improves on a television's built in speakers considerably, even though it cannot carry the newest object based audio formats such as Dolby Atmos at full quality.

Does soundbar placement really matter that much?

Yes, particularly for models using upward firing or wide dispersion drivers to create height and width effects. Centring the bar on the screen with a clear, unobstructed path to the seating area generally gives noticeably better results than tucking it inside a cabinet.