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Tech TIp: Soundbars…Convenience, Constraint, or both?

3/1/2021

2 Comments

 
Picture
​Soundbars are continuously rising in popularity as additional enhancements to many home AV Systems.

​They provide a potentially inexpensive, less labor-intensive upgrade to a television’s sound when compared to a display’s internal speakers. But this easy upgrade can also become a stranglehold in your system, limiting control, resolutions, and even audio formats.

Picture
Source: https://hdmi.org/press/pressresources

eARC Comparison

The eARC Data Channel is a bi-directional, 1MHz common mode signal which is transmitted over the eARC (HEAC) differential pair. This channel provides auto discovery and other features listed in the table
Today’s soundbars can vary slightly in the number of different kinds of inputs featured. Ultimately leaving us with a mashup of different capabilities of both audio and control.
​
The Toslink Input
  • Allows us to do compressed audio up to Dolby Digital+ 
  • While some control can be done with Toslink, it is not guaranteed to work between devices (especially if devices are not the same brand)
The HDMI ARC Input
  • Allows us to do compressed audio up to Dolby Digital+
  • Additional control over Toslink; such as TV Power Toggle, Channel/Input Tuning, and more.
The HDMI eARC Input
  • Improved upon the HDMI ARC specification, allows for ARC Fallback, display must also support eARC
  • Allows us to do uncompressed audio such as Dolby TrueHD and object-based audio such as Dolby Atmos
  • Same level of control as the HDMI ARC
Let it be noted that both Toslink and HDMI ARC can support Dolby Atmos within the compressed Dolby Digital+ Container. This audio format may be found within the internal app of some displays.

Additionally, just because a soundbar has a certain input does not mean that it accepts all formats of audio. For example, many soundbars can only take in up to Dolby Digital (Not DD+) and may produce distorted audio or no audio when an unsupported format has been used. Fortunately, many displays can limit the audio that is being sent to a soundbar.
​
Lastly, soundbars that use HDMI ARC or eARC require the use of a singular HDMI Input to send digital audio, reducing the overall number of devices that can physically be connected to a display. However, many soundbar devices feature an HDMI Passthrough Port to make up for the loss of an input.

This HDMI passthrough port can be one of the largest constraints when a soundbar is added to the system. Some soundbars feature inadequate HDMI ports to reduce cost, forcing the user to either sacrifice HDR, and at times 4K resolutions, or lose use of said input for anything but audio.

Ultimately, crisis can be avoided by understanding the whole use case of an AV Zone as well as the video and audio formats supported by the sources; then pairing a display and soundbar based upon those specifications.
​
So, are soundbars a convenience, a constraint, or both? That is for you to decide.
​
2 Comments
Clay Stahlka
3/2/2021 11:48:54 am

Come on Sam! Nobody’s using their soundbar in a recording studio. They’re designed for UC and general viewing applications. So, what makes you think that worrying about digital audio formats and resolutions has any effect on UC voice quality, etc.

This kind of thinking is exactly why so many ProAV integrators are losing business. Try being flexible and match the solution to the application.

Reply
Glenn
3/2/2021 12:36:00 pm

Recording studio? Where is that mentioned?

I had a Sony sound bar that refused to work with my LG 4K set, even though eARC was supposedly supported. I couldn't get squat out of my TV, yes TV video, refused to come out of it and that was the only way it could be connected. I sent it back.

So worrying about the interconnections is warranted in my view.

The Sound Bar industry though needs to get its collective act together though and work out problems with audio/video interconnectivity. An it wouldn't hurt the TV manufacturers to get in the game with that either.

Thanks Sam for the note.

Reply



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