March 1, 2021 - 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.

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.