The difference between HDMI ARC and eARC is the synchronization of audio and video. If you notice that the audio does not match the video, the problem may lie in the technology used. ARC is a simpler solution, but has limited bandwidth and often causes lip sync issues. Meanwhile, eARC ensures automatic synchronization and supports the highest quality audio formats.
Briefly about the main differences:
- ARC : Supports only compressed audio formats, bandwidth ~1 Mbps, manual synchronization.
- eARC : Supports uncompressed formats, bandwidth up to 37 Mbps, automatic synchronization.
Why choose eARC?
If you want to enjoy high-quality audio without having to worry about sync settings, eARC is a better option . This technology is especially useful when watching 4K content or using Dolby Atmos .
Quick comparison table:
| Function | HDMI ARC | HDMI eARC |
|---|---|---|
| Throughput | ~1Mbps | Up to 37 Mbps |
| Audio formats | Compress | Do not compress |
| Synchronization | Handbag | Automatic |
| Number of channels | Up to 5.1 | Up to 32 |
eARC technology is the right choice for those who seek high-quality sound and convenience in home theater systems.
HDMI ARC: Features and Limitations
Key HDMI ARC features
HDMI ARC (Audio Return Channel) technology allows audio signals to be transmitted in both directions using a single HDMI cable . This is especially convenient when connecting a TV to a soundbar or AV receiver [4] .
A single cable carries both audio and video, reducing cable clutter and simplifying setup. ARC also supports Consumer Electronics Control (CEC), which allows connected devices to "talk" to each other and allows the user to control multiple devices with a single remote. In terms of audio formats, ARC supports stereo PCM, compressed surround sound formats such as Dolby Digital and DTS , and in some cases, even compressed Dolby Atmos signals [4] .
However, despite these advantages, ARC technology has some technical limitations that can cause audio and video synchronization problems.
HDMI ARC limitations and lip sync issues
One of the main limitations of HDMI ARC is its limited bandwidth of around 1 Mbps. As a result, ARC can only transmit 2.0-channel PCM and compressed 5.1 formats such as Dolby Digital [5] . This limitation means that high-quality uncompressed formats such as Dolby TrueHD or DTS-HD MA cannot be transmitted. In addition, the audio processing or conversion required for these formats can cause a so-called lip sync problem, where the audio and video become out of sync.
The HDMI 1.3 lip sync protocol, which is supposed to help synchronize audio and video, often adds additional latency, as it can only further delay the audio. [6] Even modern TVs with low-latency "game mode" or ALLM features often fail to adequately compensate for audio processing delays. [6]
Common lip sync issues with HDMI ARC
These technical limitations often lead to various synchronization problems. Processing delays can occur at any stage of audio and video transmission. For example, the basic delay for bitstream content is about 32 ms, but after decoding and equalization it can increase to 80 ms for Dolby Digital/Dolby Digital Plus and even 140 ms for Dolby Atmos [6] .
As RTINGS.com notes, "ARC does not improve audio format support. Both optical and ARC support 2.0-channel PCM and compressed 5.1-channel formats (such as Dolby Digital)." [5]
Many users report that audio delay can range from 80 to 200 ms when using ARC. The problem is exacerbated by the fact that audio delay settings on most devices only allow you to delay the audio further, but do not provide the ability to speed it up when needed [6] [7] .
HDMI eARC: More advanced technology for audio synchronization
How is HDMI eARC different from ARC?
HDMI eARC (Enhanced Audio Return Channel) technology essentially eliminates the main limitations of ARC [1] . The main difference is that the data rate is significantly higher. While ARC can only transmit about 1 Mbps, eARC supports up to 37–38 Mbps [5] [9] [10] .
This technological advancement enables the transmission of uncompressed high-quality audio formats such as Dolby TrueHD , DTS-HD Master Audio , as well as full Dolby Atmos and DTS:X [9] [10] . In addition, eARC supports up to 32 audio channels at 24-bit/192 kHz quality [10] , allowing you to enjoy a cinema-quality experience at home. Another advantage is that eARC works independently of the HDMI-CEC function [1] , ensuring more stable operation.
"eARC, or Enhanced Audio Return Channel, is an improved version of ARC. It was introduced in 2017 as part of the HDMI 2.1 specification. Similar to ARC, eARC allows a TV to send audio to a soundbar or AV receiver using a single HDMI cable. However, eARC supports significantly higher bandwidth and speed than ARC, allowing it to transmit high-quality, uncompressed audio, which is not possible with ARC."
– AV Access
Automatic lip sync correction with eARC
One of the main advantages of eARC is its automatic lip sync correction. Unlike ARC, eARC automatically compensates for any audio and video delays [1] [5] [11] . This process works as follows: the audio device tells the TV how long it takes to process its signal, and the TV delays the video accordingly. For example, if the soundbar processes the signal in 35 ms, the TV will sync the video with the audio [3] .
The HDMI 2.1 standard introduced a mandatory lip sync mechanism, which ensures better compatibility between equipment from different manufacturers. [6] This means that even if you have devices from different brands, synchronization will be much more accurate.
Remaining eARC challenges
Although eARC significantly improves audio-video synchronization, issues still occur in some cases. Some users report a 1-2 second audio delay, especially when playing games [12] [8] . This is often associated with TVs in game modes, where low-latency mode ( Game Mode or ALLM) is enabled. This mode reduces video processing time, but audio may lag [6] . In such situations, AUTOGARSAS.LT specialists recommend connecting sources directly to the soundbar, bypassing the TV.
Another common problem is the choice of audio format. Some users find that switching from Bitstream to PCM format solves the latency problem. However, this means that higher audio formats, such as Atmos , are lost [8] [6] . The AUTOGARSAS.LT team helps to properly configure eARC systems according to specific devices and needs, in order to maximize the synchronization of audio and video. Proper configuration is extremely important and will be discussed in the following sections.
HDMI ARC and eARC Explained | Simplify Your System!
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HDMI ARC vs eARC: A Direct Comparison
In this section, we will discuss the main differences between HDMI ARC and eARC, with a particular emphasis on their ability to solve audio and video synchronization problems.
Comparison chart: HDMI ARC vs eARC
The table below clearly shows how these two technologies differ in their functions and capabilities:
| Function/Formats | HDMI ARC | HDMI eARC |
|---|---|---|
| Data flow | ~1Mbps | Up to 37 Mbps |
| PCM support | 2.0 stereo only | Up to 7.1 PCM |
| Dolby Digital/DTS 5.1 | ✔ (compressed) | ✔ (compressed) |
| Dolby Digital Plus (DD+) | ✔ (limited) | ✔ (higher bitrate) |
| Dolby TrueHD/DTS-HD MA | ✘ Not supported | ✔ Uncompressed support |
| Dolby Atmos/DTS:X | Limited (compressed via DD+) | ✔ Full support (uncompressed) |
| Lip sync correction | Manual | Automatic |
| Cable requirements | High-Speed HDMI | Ultra High-Speed HDMI (HDMI 2.1) |
| Audio channels | Up to 5.1 | Up to 32 channels |
| HDMI standard | HDMI 1.4+ | HDMI 2.1 |
eARC technology allows data transfer rates of up to 37 Mbps, which is 37 times faster than ARC. [13] This bandwidth allows eARC to support uncompressed high-quality audio formats that ARC simply cannot handle.
Impact on home theater systems
These technical differences have a direct impact on your home theater experience. Generally speaking, ARC is fine for basic needs , such as using simple soundbars or lower-quality sources. However, if your system requires the highest quality audio and video synchronization, eARC becomes an indispensable option.
eARC exploits the full potential of Dolby Atmos . For example, when watching 4K Ultra HD Blu-ray movies with uncompressed Dolby TrueHD Dolby Atmos audio, the difference becomes obvious [14] . Meanwhile, streaming platforms such as Netflix or Disney+ use a compressed version of DD+ , which ARC can transmit, but this results in a loss of audio quality. [14] [15]
Additionally, eARC automatically compensates for audio and video delays, eliminating the need for manual synchronization. This is especially important for gaming enthusiasts or those who frequently switch audio and video sources.
AUTOGARSAS.LT products for ARC and eARC technologies
Taking these differences into account, AUTOGARSAS.LT offers various solutions tailored to both basic and high-end needs.
- For starters: the Samsung HW-Q700C soundbar, which is ideal for 20-30 m² living rooms with 4K TVs. This model supports Dolby Atmos and HDMI ARC/eARC, ensuring high-quality surround sound.
- For mid-range solutions: NAD C 3050 stereo sound amplifier for €1,599.00 [18] . This device with HDMI eARC input provides high-quality 2.0/2.1 channel sound, has 100 W per channel power and supports Dirac Live acoustic correction.
- For premium solutions: McIntosh MX200 A/V processor for €9,700.00 [16] . It supports Dolby Atmos , DTS:X and eARC, can process up to 11.2 channels of audio, and has built-in Dirac Live full-frequency acoustic correction.
- Alternative: Marantz SR6013 9.2 Network AV Receiver for €1,399.00 , which supports eARC technology, Dolby Atmos and DTS:X formats. It offers 185 W per channel and Audyssey MultEQ XT32 calibration system [17] .
The AUTOGARSAS.LT team is ready to help you choose the most suitable solution, taking into account your needs and budget. Our experience in the field of Hi-Fi and home cinema ensures that your system will make the most of the eARC capabilities.
How to fix audio sync problems in home theater systems
Audio and video synchronization can be achieved in a variety of ways, but the most important are proper equipment setup, selection of appropriate components, and professional installation.
Setup tips that work
First, you should make sure you have the right HDMI cables. If you're using eARC, HDMI 1.4 or higher will suffice [2] .
The connection scheme is also very important. One way is to connect all devices to the TV's HDMI inputs and use a single cable between the TV and the sound system's eARC ports. Another option is to connect the sources directly to the sound system, if it has multiple HDMI inputs [2] . AUTOGARSAS.LT recommends connecting sources directly to the receiver or soundbar whenever possible.
Remember to enable ARC/eARC and HDMI CEC on both your TV and sound system [2] . If you are experiencing sync issues, it is worth experimenting with bitstream and PCM formats. PCM often eliminates sync issues, although it may limit the range of supported formats [2] [23] . If automatic sync doesn't work, try using the manual audio delay settings [6] .
Choosing equipment is an important step
To ensure the best synchronization, it is important to choose equipment that supports eARC and has a built-in automatic synchronization function [2] [1] .
AUTOGARSAS.LT offers various products for precise audio synchronization. One of them is the Lithe Audio WiSA Module Bolt-On , priced at €119.00. This module provides a latency of just 5.2 ms and a difference between speakers of less than 1 microsecond [19] .
"Our WiSA Bolt-On Module adds wireless Dolby Atmos, high-quality sound without noticeable synchronization issues to our in-ceiling speakers, ideal for fully-featured wireless surround sound home theater systems and entry-level AV home setups." [19]
WiSA technology allows for the transmission of up to eight channels of uncompressed 24-bit, 96 kHz audio with ultra-low latency, which is less than 1/10th the latency of typical Bluetooth devices.
If you're looking for a higher-end solution, the McIntosh MX123 A/V processor is worth considering, priced at €14,800.00. It has built-in Dynamic Lip-sync and supports eARC [21] . Another option is the McIntosh MX200 , priced at €9,700.00. This model supports eARC and has Dirac Live full-bandwidth room correction [20] .
Professional installation with AUTOGARSAS.LT
To achieve perfect audio and video synchronization, it is worth contacting professionals. AUTOGARSAS.LT, with more than 27 years of experience, offers comprehensive services - from consultations to full system installation [22] .
A professional installation involves not only connecting the devices, but also a thorough system calibration. Using advanced technologies such as Dirac Live , precise audio synchronization can be achieved and ensure that your home theater system operates flawlessly.
Conclusion: The best solution for audio synchronization
eARC stands out as a leading technology in the field of audio synchronization due to its 37 Mbps bandwidth and automatic lip sync correction. Modern high-quality audio formats, such as Dolby Atmos , DTS:X , Dolby TrueHD and DTS-HD Master Audio , require extremely precise synchronization. eARC provides this without additional settings, while ARC, with its limited bandwidth, often encounters interference [9] [24] . It is precisely these features that make eARC an excellent choice for home theater systems that strive for the highest quality.
ARC is based on CEC technology, but eARC is independent because it uses a separate data channel. This ensures more stable and reliable operation.
AUTOGARSAS.LT offers professional installation services that will help your home theater system work flawlessly. Our specialists are ready not only to install, but also to optimize these technologies according to your needs. By choosing eARC, you are investing in a cutting-edge solution that ensures flawless audio and video synchronization from various sources.
Choose eARC, a technology that not only meets, but exceeds, modern standards for high-quality audio reproduction.
FAQs
How is HDMI eARC superior to ARC when using home theater systems?
HDMI eARC ( Enhanced Audio Return Channel ) is an improved version of ARC that provides higher data throughput. This allows for high-quality audio, including Dolby Atmos , that standard ARC cannot deliver.
Why choose eARC?
- Wider audio format support : eARC supports high-resolution and advanced audio formats for impressive sound.
- Stable and easy transmission : A single HDMI cable ensures smooth and reliable audio transmission, avoiding compatibility issues.
- Higher sound quality : This is especially important if you use modern sound systems or home theater equipment.
If you want to enjoy impeccable sound, visit AUTOGARSAS.LT . Here you will find a wide selection of HDMI cables and home theater systems that will help you create a real cinema atmosphere in your home.
How do I fix audio and video sync issues with HDMI ARC?
To fix audio and video sync issues with HDMI ARC , first check your TV settings. Many TVs and home theater systems have a feature that allows you to adjust the audio delay so that the sound matches the video exactly.
Also, check that you are using the correct HDMI cable that supports ARC, and that all connected devices are HDMI ARC compatible. If the problem still persists, it is worth updating the devices' software. Alternatively, switch to HDMI eARC , which provides better synchronization and higher data transfer rates.
What technical requirements are necessary to use eARC technology?
To use eARC technology, you need to make sure your equipment meets certain technical requirements. First of all, it must support the HDMI 2.1 standard, which allows for high data throughput of up to 37 Mbps. This allows for the transmission of high-quality audio , including Dolby Atmos and uncompressed audio formats.
You will also need compatible devices that support eARC and a suitable High Speed HDMI cable . It is also important to ensure that all devices are properly configured to take full advantage of the technology.
