How to choose your sound bar: technologies, how to find your way?

Sound bars have long been shunned by moviegoers and audiophiles, and with good reason. Not so long ago, these devices only reproduced the bad sound of television sets, but at a higher volume. That era is long gone, but now the conscientious buyer will need to study the choices offered to him because there are so many features available. There is a sound bar on the market for all kinds of uses such as surround sound cinema, immersive Atmos cinema and streaming sound from the web.

In this article, I will share with you the technologies offered.

2 types of sound bars: with or without dedicated woofer (SUB)

Many soundbars work with a separate subwoofer, which may be included in the package or available as an option. Since a soundbar is still quite compact, bass performance will be compromised without it.

In most cases, the subwoofer will be wirelessly connected for easy placement.

For a smaller footprint, some soundbars offer a small built-in subwoofer in slightly larger units. 

These will offer an acceptable sound. In this particular case, I strongly advise you to listen to them before buying, because techniques are evolving rapidly in the field of small format reproduction. Some will surprise you while others, less evolved, will not be worth the trouble.

More recently, we've seen bars with an "ultra thin" design. The ultra slim design is felt to fit perfectly on a wall mounted TV: you fix it to the wall and there goes the clutter! Adding a subwoofer is a must here...

Types of surround sound

Stereophony 2.0

As an ambience creation, the bare minimum will be stereophony with added depth effects. This approach is in the realm of cheap bars and offers the same thing as your TV but louder. We'll call it 2.0 sound.

To get a better performance, especially for the voice track, we will talk about a 3.0 type sound which will consist in adding a third speaker in the middle of your bar to reproduce only the dialogues. 

If either of the above includes a subwoofer, a "1" is added to its designation, i.e. 2.1 or 3.1 sound.

2D 5.1 or 7.1 surround sound

It will offer a rear-to-front ambience via rear sound boxes for the 5.1 and a rear and side combination for the 7.1. You will have the choice between virtual or organic simulated effects. For virtual effects, the use of reverb on walls and ceilings will be the norm, while for an organic feel, the use of additional rear and side boxes will be required. Certainly, the realism offered by the extra speakers will be preferable despite their clutter.

- The soundtracks of this type include "Dolby digital" or "DTS Digital Surround".

3D surround sound 5.1.2 7.1.2 and more 

These are the bars offering three-dimensional sound (Dolby Atmos or DTS: X), i.e. sound coming from both the sides and the top. Vertical speakers are generally integrated into the soundbar, using the ceiling to reflect sound towards the viewer. The best sets, such as the Samsung HW-Q990B, will feature true back boxes with upward-firing components. The vertical component is identified by a third number. For example, a 7.1.4 system such as the Samsung 990 will have four vertical channels.

Types of diffusion of surround effects

There are three ways to produce surround sound:

1- Virtual surround sound

This technique uses a digital interpretation circuit to create a resonance that gives the illusion of sound going around you. The degree of immersion experienced will depend on the effectiveness of this audio processing but will be limited in any case. A busy environment will be detrimental to the result.

2- Virtual surround sound by reflection

This will consist of speakers placed at different angles in the cabinet as well as, for the more sophisticated, speakers aimed at your ceiling. They use the walls or the ceiling (for a 3D surround) to reflect the sound and give an enveloping sound. Since this time the sound is real, coming from real speakers, you will have a superior immersion performance.

3- True surround sound

If you're looking for a truly immersive sound experience, you'll want to choose a model that includes a set of rear speakers. As with a full-size home theater system, having true 3D rear speakers aimed at the ceiling will provide maximum realism.

To realize the superiority of this approach and as an example, imagine a total silence while an airplane in the distance, in the background, approaches, only the rear speakers work on a real system, this work is impossible to achieve with a bar that uses the walls to recreate the rear field, even less achievable with a virtual effect, because in both cases, the rear sound will be generated by the front speakers...

It's interesting to know that many manufacturers offer optional rear speakers for their more affordable packages. So you can get "true surround sound" without having to buy the ultimate sets. The cost of this addition ranges from $200 to $350.

Criteria to consider

The power: it is expressed in watts, the more the better because let's be honest, when we watch a movie, we don't want to listen to lullabies!

200 watts would be a good start, ideally 400 watts including a value of 150 for a subwoofer would be preferable.

The number of speakers

There is no magic number, but the more of them you have, the more certain you are to get well defined effects.

Three types of elements are proposed such as the "woofer" for the low frequencies, the "mid" for the medium frequencies such as voices and the "tweeter" for the high frequencies which is critical for the production of the sound field and the musical rendering.

Complementary use: music streaming

Some models offer the possibility via a mobile application to access streaming music services. Thus, the best sound bars will turn into a competent sound system. Not silly when you think about it, because the TV, except for the rooms dedicated to this purpose, is often placed in a rest area of the household. In this case, pay attention to the features that affect the musicality of the set, including the use of high-level tweeter and the ability to play audio files of flac, dsd and other variants known for their realism and absence of losses (lossless).

To not be limited...

It is important to know the type of audio encoding for the widest choice of listening. There are encodings dedicated to cinema use and others for music listening.

CINEMA USE:

Dolby encoding

• Dolby digital : 5.1, = compressed sound available since 2000
• Dolby Digital Plus: 7.1, = with a higher bit rate offering a more natural sound
• Dolby True HD: 7.1, = high fidelity lossless audio compression
• Dolby Atmos: = three-dimensional sound (5.1.2, 9.1.4, etc.)

DTS encoding

• DTS Digital Surround: 5.1, = oldest compressed sound.
• DTS-HD High Resolution Audio: 7.1, = less compressed, more natural.
• DTS-HD Master Audio: 7.1, = high fidelity lossless audio compression.
• DTS : X : = 3D sound (5.1.2, 7.1.4, etc.)

USE OF MUSIC LISTENING :

Encoding:

• MP3 = Minimalist performance.
• AAC = CD quality.
• FLAC Hi-Rez = high-fidelity performance.
• DSD = studio quality (rarely offered on sound bars.

Wired connectivity type

There are several ways to connect your sound bar to the TV. In the past, we used an RCA-type cable that only allowed stereophony with simulated ambience at best.

Subsequently, digital processing has allowed the transfer of the signal via fiber optic or S/PDIF and this remains the way to do it for both new and old TVs. The audio quality is excellent. It is possible to transmit multichannel sound, but the number of compatible formats is lower [no Dolby True HD or DTS HD Master Audio and so on].

However, with the advent of more and more devices connected via an HDMI cable [TV set-top box, game console, Blu-Ray player, Chromecast, etc.] the industry has developed a new bidirectional transmission protocol allowing the exchange of information in the transmission chain opening the door to an even more accurate performance. This protocol is called "eARC" and allows the transmission of all high-resolution formats. Also appreciated is the possibility of controlling the volume with a single remote control, that of the television set.

Type of wireless connectivity

If you're lucky enough to own a TV that's 5 years old or less, you'll probably be able to connect one of the new bars via Bluetooth. With Bluetooth, you'll get top-level performance for everyday cinema listening. High-flying cinema fans, on the other hand, will prefer HDMI cabling or the latest innovation, WI-Ficonnectivity! WI-Fi's bi-directional transmission speed ensures precision and real-time audio patching. WI-FI also enables the transport of streaming music frames [Spotify Deezer and others], as well as the voice control offered by Google and Alexa in particular.

Aesthetic consideration

In all of the products offered, there are great advances in aesthetics. The use of various shapes according to a squared or round theme as well as the addition of real fabrics will allow your acquisition to better blend into your decor.

 
The final word

Here are the basics to find your way around. There is something for everyone! Absolutely!

Stay tuned!

Christian.