Deep Analysis of Eclipsa File Format and Pass-Through, and Guide to Integration with AmpVortex AVR

I. Preface

Eclipsa Audio, an open-source, royalty-free immersive audio format jointly launched by Google, Samsung, Arm, and the Alliance for Open Media (AOM), is built based on the IAMF (Immersive Audio Model and Formats) standard. As an important alternative to Dolby Atmos and DTS:X, it has been widely used in high-end audio-visual, multi-room audio systems and automotive audio scenarios due to its multi-channel scalability, cross-device compatibility, and lossless transmission advantages. AmpVortex AVR, as a professional multi-room streaming amplifier, and ampvortex-car series for automotive scenarios, both support multi-protocol integration such as Matter, KNX, and Control4, and have powerful audio decoding and pass-through capabilities, making them the core hardware carriers for realizing the landing of Eclipsa immersive audio.

This document will deeply analyze the technical architecture and encoding characteristics of the Eclipsa file format, disassemble its pass-through principle and key technical points, provide a full-process integration plan from pre-preparation, wiring configuration to test verification combined with the hardware characteristics of AmpVortex AVR, and answer common questions during the integration process to help technical personnel quickly realize the stable operation of Eclipsa audio in the AmpVortex AVR system.

II. Deep Analysis of Eclipsa File Format

2.1 Core Definition and Positioning

The Eclipsa file format is an immersive audio file specification based on the IAMF standard. Essentially, it is an encapsulation carrier of “audio data + spatial metadata”. Its core positioning is to provide a low-cost, high-compatibility 3D immersive audio solution. It does not require payment of copyright fees and supports adaptation to existing hardware devices through software updates, breaking the ecological barriers of traditional proprietary audio formats. Compared with formats such as Dolby Atmos, Eclipsa focuses more on openness and flexibility, and can be adapted to full-scenario applications from entry-level audio-visual devices to high-end professional power amplifiers, especially suitable for large-scale deployment of multi-room audio systems.

2.2 Technical Architecture and Core Components

The Eclipsa file adopts a layered encapsulation architecture, which is divided into “Container Layer – Encoding Layer – Metadata Layer – Raw Audio Layer” from top to bottom. Each layer works independently and collaboratively, ensuring both format compatibility and accurate rendering of immersive audio. The specific components are as follows:

2.2.1 Container Layer

As the “shell” of the Eclipsa file, it is responsible for encapsulating all audio data, metadata, and related configuration information. The mainstream container format is MP4 (complying with the ISO Base Media File Format standard), which can be directly embedded in video files or exist as independent audio files (usually with the suffix .ecl or .mp4). The container layer supports multi-track encapsulation, which can carry Eclipsa audio tracks, ordinary stereo tracks, and backup tracks at the same time, adapting to the decoding capabilities of different devices and ensuring backward compatibility.

2.2.2 Encoding Layer

The encoding layer is the core of the Eclipsa file, responsible for compressing and encoding raw audio data to balance sound quality and transmission efficiency. It supports multiple encoding formats to adapt to different scenario requirements:

• Opus Encoding: The preferred encoding format, optimized through Arm Neon SIMD extension, with efficient compression ratio and low latency characteristics. It supports sampling rates from 16kHz to 48kHz, adapts to various devices such as mobile phones and power amplifiers, and can ensure clear sound quality even at low bit rates, especially suitable for multi-room audio transmission;
• FLAC Encoding: A lossless encoding format, suitable for high-end audio-visual scenarios. It can retain all details of the original audio, meeting the ultimate sound quality needs of audiophiles, and is often used for local high-definition audio file storage and transmission;
• AAC/LPCM Encoding: Compatible with traditional audio devices. LPCM is an uncompressed encoding that can be directly used for power amplifier decoding and output without additional transcoding, reducing device computing power consumption.

The core advantage of the encoding layer is “adaptive encoding”, which can dynamically adjust the bit rate according to the complexity of the audio content. For example, reduce the bit rate for human voice scenarios and increase the bit rate for symphony scenarios, balancing transmission efficiency and sound quality experience.

2.2.3 Metadata Layer

The metadata layer is the key to Eclipsa’s immersive audio. It is responsible for recording information such as the spatial position of audio, channel mapping, and dynamic rendering rules. It is transmitted synchronously with the encoded audio data. The decoding end can realize 3D positioning and dynamic adjustment of sound according to the metadata. The core metadata includes:

• Channel Configuration Metadata: Defines the number of audio channels (supporting up to 28 input channels) and channel types (main channel, surround channel, height channel, etc.), supports dynamic channel mapping, and can automatically adapt to the number of speakers of the playback device;
• Spatial Position Metadata: Records the 3D coordinates (horizontal angle, vertical angle, distance) of each sound object, supports dynamic movement of sound objects, such as simulating the sound effect of a helicopter flying overhead, to achieve a more realistic immersive experience;
• Rendering Rule Metadata: Defines the audio rendering method, including binaural rendering (adapting to headphones) and multi-speaker rendering (adapting to home theaters and multi-room systems), which can automatically switch rendering strategies according to the type of playback device.

2.2.4 Raw Audio Layer

It stores unencoded raw audio data (PCM format), which is the input source of the encoding layer. It supports multi-channel raw audio collection and encapsulation, with a maximum sampling rate of 96kHz and a bit depth of 16bit/24bit, meeting the sound quality requirements of high-end audio. The raw audio layer can be independently extracted for post-editing, transcoding, or local playback.

2.3 Format Advantages and Limitations

2.3.1 Core Advantages

• Open Source and Royalty-Free: No copyright fees need to be paid, reducing the cost of equipment manufacturers and content creators, suitable for large-scale commercial and personal use, especially adapting to the commercial multi-room audio scenario of AmpVortex AVR;
• High Compatibility: Based on the open IAMF standard, it supports adaptation to existing TVs, power amplifiers, soundbars and other devices through software updates without replacing hardware, which is highly consistent with the multi-protocol integration characteristics of AmpVortex AVR; (Note: As of February 2026, all TVs only support local decoding and playback of Eclipsa, and cannot temporarily pass through Eclipsa audio to power amplifiers via HDMI eARC)
• Immersive Experience: Supports 3D spatial audio rendering, can carry up to 28 channels, and can dynamically adapt to speaker configuration. Combined with the multi-room control capability of AmpVortex AVR, it realizes full-space immersive audio coverage;
• Flexible Adaptation: Supports multiple encoding formats and container encapsulation, can be used as an independent audio file or embedded in video, adapting to various scenarios such as local playback and streaming transmission. At the same time, it supports lossless and lossy encoding, balancing sound quality and transmission efficiency.

2.3.2 Limitations

• Insufficient Ecological Maturity: Compared with Dolby Atmos, the content library and device support range of Eclipsa are still expanding, and some old power amplifiers may need additional software updates to support it;
• HDMI Transmission Limitations: Limited by the current HDMI 2.1 standard, the height channel information may not be completely transmitted during PCM pass-through, which needs to be solved by the optimization of the HDMI 2.2 standard;
• Decoding Computing Power Requirements: The dynamic rendering of immersive audio requires a certain amount of device computing power. Low-end power amplifiers may have decoding delays, freezes and other problems, while the high-performance decoding chip of AmpVortex AVR can effectively avoid this problem.

III. Deep Analysis of Eclipsa Pass-Through Principle

3.1 Core Definition of Pass-Through

Eclipsa Pass-Through refers to the process in which an audio source device (such as a Blu-ray player, streaming media player, or mobile phone) directly transmits the Eclipsa-encoded audio signal to a decoding device such as AmpVortex AVR without any decoding or transcoding processing, and the decoding device completes the decoding and rendering output of the Eclipsa audio. The core value of pass-through is “lossless transmission”, which avoids sound quality loss and increased delay caused by intermediate transcoding links, and gives full play to the professional decoding capability of AmpVortex AVR to achieve the best immersive audio experience.

Different from ordinary audio transmission, Eclipsa pass-through needs to transmit “encoded audio data + spatial metadata” at the same time, which requires the transmission link to support high bandwidth and low latency, and the protocol coordination between devices to be consistent. Otherwise, problems such as metadata loss, audio freezes, and no sound will occur.

3.2 Pass-Through Classification and Transmission Link

According to the different transmission media and protocols, Eclipsa pass-through is mainly divided into two types, which are suitable for different application scenarios and can be integrated with AmpVortex AVR. The details are as follows:

3.2.1 HDMI Pass-Through (Mainstream Solution)

HDMI pass-through is the preferred transmission method for Eclipsa audio. It supports high-bandwidth and low-latency transmission, and can transmit audio and video signals at the same time, adapting to scenarios such as home theaters and multi-room audio-visual systems. The transmission link is:
Audio Source Device (e.g., Blu-ray Player, Google TV) → HDMI Cable → AmpVortex AVR (Pass-Through Mode) → Decoding and Rendering → Speakers/Multi-Room Audio System.

Core Requirements: The transmission link needs to support HDMI 2.0 or above (HDMI 2.1 is recommended) to ensure that the bandwidth meets the transmission needs of Eclipsa audio (especially lossless encoding); at the same time, HDMI CEC function needs to be enabled to realize protocol coordination between devices and ensure the normal triggering of pass-through mode. It should be noted that the current HDMI 2.1 standard has limitations, and the height channel information may not be completely transmitted during PCM pass-through, which needs to be avoided through software optimization or hardware upgrade.

3.2.2 Network Pass-Through (Multi-Room Solution)

Network pass-through is suitable for multi-room audio scenarios. It transmits Eclipsa audio signals based on the TCP/IP protocol, does not rely on HDMI cables, and can realize the collaborative work of multiple AmpVortex AVRs. The transmission link is:
Audio Source Device (e.g., NAS, Streaming Server) → Local Area Network (Wired/Wireless) → AmpVortex AVR (Network Pass-Through Mode) → Decoding and Rendering → Speakers in Each Room.

Core Requirements: The local area network bandwidth needs to be ≥100Mbps (≥1Gbps is recommended for lossless encoding) to avoid network freezes and packet loss; the audio source device needs to support network streaming transmission of Eclipsa files, and the AmpVortex AVR (or ampvortex-car for automotive scenarios) needs to enable the network pass-through function and be in the same local area network as the audio source device to ensure IP intercommunication. Combined with the Web API capability of AmpVortex AVR and ampvortex-car, remote control of pass-through parameters, switching of audio sources and other operations can be realized.

3.3 Key Technical Points of Pass-Through

3.3.1 Protocol Coordination Mechanism

Eclipsa pass-through requires IAMF protocol coordination between devices (audio source and AmpVortex AVR). The audio source device needs to correctly identify the decoding capability of AmpVortex AVR and output Eclipsa-standard encoded signals; AmpVortex AVR needs to confirm the signal format of the audio source through protocol negotiation and automatically switch to pass-through mode to avoid problems such as signal incompatibility and metadata loss.

For HDMI pass-through, it is necessary to enable the HDMI ARC/eARC function: eARC (Enhanced Audio Return Channel) supports higher bandwidth and can transmit lossless Eclipsa audio, which is the first choice for HDMI pass-through; ARC only supports lossy encoding, which is suitable for entry-level scenarios. For network pass-through, it is necessary to ensure that the devices support DLNA, AirPlay 2 or custom network protocols to realize the streaming transmission of Eclipsa audio.

3.3.2 Synchronous Transmission of Metadata

Metadata is the core of Eclipsa’s immersive experience. During pass-through, it is necessary to ensure the synchronous transmission of metadata and audio data, and the time difference should be controlled within 10ms. Otherwise, the problem of mismatch between sound and spatial positioning will occur (such as sound appearing in advance or delayed).

The core of achieving synchronization is the “timestamp synchronization mechanism”: when the audio source device transmits audio data and metadata, it will add a unified timestamp; after receiving it, AmpVortex AVR aligns the two according to the timestamp to ensure synchronization during decoding and rendering. At the same time, the hardware decoding chip of AmpVortex AVR will perform real-time compensation for transmission delay to further improve synchronization accuracy.

3.3.3 Pass-Through Mode Switching

AmpVortex AVR supports both automatic and manual pass-through mode switching to adapt to different scenario requirements:

• Automatic Switching: When AmpVortex AVR receives an Eclipsa-encoded signal via HDMI/network, it automatically identifies the signal format and switches to pass-through mode without manual intervention;
• Manual Switching: Manually enable the pass-through mode through the panel, remote control or Web management interface of AmpVortex AVR to force the input signal to be passed through to the decoding module, which is suitable for testing, debugging or special scenarios (such as abnormal signal recognition).

It should be noted that after the pass-through mode is enabled, AmpVortex AVR will turn off its own encoding and transcoding functions, and only retain the decoding and rendering functions to ensure the lossless transmission of audio signals.

3.3.4 Anti-Interference and Fault-Tolerant Mechanism

During pass-through, problems such as signal interference and packet loss will cause audio freezes, noise, and metadata loss. AmpVortex AVR improves pass-through stability through the following mechanisms:

• Signal Verification: Real-time verification of the received Eclipsa signal. If packet loss or bit error is detected, it will automatically trigger a retransmission request (network pass-through) or signal compensation (HDMI pass-through);
• Cache Mechanism: Built-in high-speed cache module to temporarily store the passed-through audio data and metadata, avoiding freezes caused by network fluctuations and signal delays;
• Anti-Interference Design: Shielding circuits are adopted at the hardware level to reduce signal interference from HDMI cables and network cables (and in-vehicle electromagnetic interference for ampvortex-car); the protocol parsing algorithm is optimized at the software level to improve the anti-interference ability of signal recognition.

IV. Full-Process Guide for Integrating Eclipsa with AmpVortex AVR

4.1 Pre-Integration Preparation

4.1.1 Equipment and Environment Preparation

• Hardware Equipment: AmpVortex AVR (ensure the firmware version is the latest, supporting Eclipsa decoding and pass-through;AmpVortex 16060 series, 16100 series, and 16200 series are recommended, all supporting multi-channel decoding and multi-protocol integration), ampvortex-car (for automotive audio scenarios, supporting Eclipsa decoding and in-vehicle pass-through), audio source device (such as Blu-ray player, Google TV, NAS, mobile phone, which needs to support Eclipsa file playback and pass-through), HDMI cable (HDMI 2.1 version, supporting eARC function, used for HDMI pass-through), network cable (Cat5e or above, used for network pass-through), speakers (supporting multi-channel output, adapting to Eclipsa’s immersive rendering, ensuring matching with the impedance and power of AmpVortex AVR and ampvortex-car);
• Software and Files: Eclipsa format audio files (with suffix .ecl or .mp4, it is recommended to choose Opus or FLAC encoding to ensure the standardization of the audio source), AmpVortex AVR management software (used for configuring pass-through parameters and firmware upgrade), playback software of the audio source device (supporting Eclipsa file playback, such as VLC, Google Play Music);
• Environment Check: Ensure all devices are well grounded to reduce signal interference; the local area network environment is stable (network pass-through scenario) without obvious freezes or packet loss; HDMI cables and network cables are firmly connected to avoid poor contact.

4.1.2 Equipment Firmware and Parameter Check

1. Upgrade AmpVortex AVR Firmware: Log in to the AmpVortex AVR management interface (Web or App), check the firmware version. If it is not the latest version, download and install the latest firmware to ensure support for Eclipsa decoding and pass-through functions;
2. Confirm Audio Source Device Capability: Check whether the audio source device supports Eclipsa file playback and pass-through. For example, Google TV and Samsung TVs launched after 2025 natively support local decoding and playback of Eclipsa. Old devices need to upgrade the system or install special playback software; (Note: Such TVs do not temporarily support Eclipsa audio pass-through via HDMI eARC, and can only perform local decoding and output)
3. Check Interface Compatibility: Confirm that the HDMI interface of AmpVortex AVR supports eARC function (usually marked “eARC/ARC”), and the network interface supports Gigabit Ethernet (network pass-through scenario); the speaker interface matches the wire, distinguish positive and negative poles to avoid sound quality abnormalities or equipment damage caused by wrong wiring.

4.2 Two Integration Solutions (HDMI Pass-Through + Network Pass-Through)

4.2.1 Solution 1: HDMI Pass-Through Integration (Home Theater/Single-Room High-End Scenario)

Step 1: Hardware Wiring

1. Turn off the power of all devices (safety first, avoid short circuit or electric shock during wiring);
2. Connect the HDMI output interface of the audio source device (such as a Blu-ray player) with an HDMI 2.1 cable, and connect the other end to the HDMI input interface of AmpVortex AVR (marked “HDMI IN”, preferably the interface supporting eARC);
3. Connect the HDMI output interface of AmpVortex AVR (marked “HDMI OUT/eARC”) with an HDMI 2.1 cable, and connect the other end to a TV/monitor (used for video output, this step can be omitted if video is not needed);
4. Connect Speakers: According to the Eclipsa channel configuration (such as 5.1.2, 7.1.4), connect the speakers to the corresponding channel output interfaces of AmpVortex AVR, ensuring correct connection of positive and negative poles (red terminal to positive pole, black terminal to negative pole) to avoid sound quality abnormalities caused by opposite phases; after connection, gently pull the wire to confirm it is firm, and check for the risk of short circuit caused by exposed copper wires;
5. Turn on the power of all devices and start the devices.

Step 2: Parameter Configuration

1. Configure AmpVortex AVR: Log in to the management interface, enter “Audio Settings” → “Pass-Through Settings”, enable the “HDMI Pass-Through” function, and select “eARC Mode” (if the audio source device does not support eARC, select “ARC Mode”); enable “Eclipsa Decoding Support” to ensure that the AVR can identify Eclipsa signals;
2. Configure Audio Source Device: Enter the settings interface of the audio source device, enable the “HDMI Audio Pass-Through” function, and select “Eclipsa” as the audio output format; turn off the built-in decoding function of the audio source device to ensure that the audio signal is passed through to the AVR in the original encoded format;
3. Configure TV (if connected): Enter the TV settings, enable the “HDMI eARC” function, and set the audio output to “Pass-Through to Amplifier” to avoid secondary processing of the audio signal by the TV; (Note: Current TVs do not temporarily support Eclipsa audio pass-through. This step is only used for video signal transmission and ordinary audio pass-through. Eclipsa pass-through needs to be realized through professional audio source devices such as Blu-ray players and Google TV set-top boxes)

Step 3: Test and Verification

1. Play Eclipsa format audio files (or video files with Eclipsa audio) on the audio source device;
2. Check the status of AmpVortex AVR: The management interface displays “HDMI Pass-Through in Progress” and “Eclipsa Decoding in Progress”, the panel indicator is normal, and there is no error;
3. Sound Quality and Immersive Test: Listen to the speaker output, confirm that the sound is clear, free of freezes and noise; test the spatial positioning effect (such as sound coming from different directions) to confirm that the metadata transmission is normal; gradually increase the volume and check for distortion or distortion;
4. Abnormal Troubleshooting: If there is no sound, check the HDMI cable connection and whether the pass-through mode is enabled; if the sound quality is abnormal, check the speaker positive and negative poles and whether the audio source file is standard; if freezes occur, check whether the HDMI cable supports HDMI 2.1 and whether the device firmware is the latest.

4.2.2 Solution 2: Network Pass-Through Integration (Multi-Room Audio Scenario)

Step 1: Hardware Wiring and Network Configuration

1. Turn off the power of all devices, and connect AmpVortex AVR and audio source devices (such as NAS, streaming server) to the same local area network: connect the network interface of AmpVortex AVR to the router with a network cable, and the audio source device to the router via wired or wireless; ensure that all device IPs are in the same network segment without IP conflicts;
2. Connect Speakers: According to the multi-room layout, connect the speakers in each room to the corresponding channel output interfaces of AmpVortex AVR, ensuring correct connection of positive and negative poles, and matching impedance and power;
3. Turn on the power of all devices and start the devices, confirm that both AmpVortex AVR and the audio source device are normally connected to the local area network.

Step 2: Parameter Configuration

1. Configure AmpVortex AVR: Log in to the management interface, enter “Network Settings” to confirm that the network connection is normal; enter “Audio Settings” → “Pass-Through Settings”, enable the “Network Pass-Through” function, and select the transmission protocol (DLNA or custom protocol is recommended, adapting to AmpVortex Web API); enable “Eclipsa Decoding Support” and set multi-room audio synchronization parameters (delay compensation within 10ms);
2. Configure Audio Source Device: Build an Eclipsa audio file library on the NAS/streaming server to ensure the file format is standard (Opus/FLAC encoding, MP4 container); enable the network streaming transmission function of the audio source device, set sharing permissions, and ensure that AmpVortex AVR can access the audio files;
3. Multi-Room Configuration (Optional): If multiple AmpVortex AVRs need to work collaboratively, add other AVR devices in the management interface, configure multi-room groups, and ensure that the pass-through parameters of all AVRs are consistent to achieve synchronous audio output.

Step 3: Test and Verification

1. In the AmpVortex AVR management interface, select the network pass-through mode, add the Eclipsa file library of the audio source device, and select the audio file to play;
2. Status Check: AmpVortex AVR displays “Network Pass-Through in Progress” and “Eclipsa Decoding in Progress”, the network connection is stable, and there is no packet loss or freeze;
3. Multi-Room Test: Play audio, confirm that the speakers in each room output synchronously, with clear sound and no delay; test the spatial positioning effect to confirm that the metadata transmission is normal;
4. Abnormal Troubleshooting: If the audio source cannot be accessed, check the network connection and sharing permissions; if freezes occur, check the local area network bandwidth and network packet loss rate; if multi-room is out of synchronization, adjust the delay compensation parameters.

4.3 Key Notes for Integration

• Firmware Upgrade: The firmware of AmpVortex AVR and audio source devices must be kept up-to-date to avoid Eclipsa signal recognition failure and pass-through abnormalities caused by outdated firmware versions;
• Wire Selection: HDMI 2.1 cable must be used for HDMI pass-through to ensure support for eARC and high bandwidth; Cat5e or above network cable is used for network pass-through to avoid network signal interference; speaker wires should be of good conductivity, and the wire diameter should be adjusted according to the transmission distance to avoid signal attenuation;
• Parameter Matching: The Eclipsa encoding format of the audio source device must match the decoding capability of AmpVortex AVR and ampvortex-car (such as supporting Opus/FLAC encoding) to avoid decoding failure; the impedance and power of the speaker must match the output parameters of AmpVortex AVR and ampvortex-car to avoid equipment damage;
• Interference Avoidance: When placing devices, avoid placing AmpVortex AVR close to other strong interference devices (such as routers, air conditioners); separate HDMI cables, network cables and power cables to reduce electromagnetic interference; ensure all devices are well grounded to further reduce interference;
• Metadata Integrity: Ensure the metadata of the Eclipsa file is complete. If the metadata is lost, the immersive effect will fail, and only ordinary stereo can be played; it is recommended to obtain Eclipsa files through formal channels to avoid file damage.

V. Common Eclipsa and AmpVortex AVR Integration Faults and Solutions

VI. Summary and Outlook

As an open-source and royalty-free immersive audio standard, the Eclipsa file format, with its flexibility, compatibility and immersive advantages, is gradually becoming the mainstream choice for high-end audio-visual and multi-room audio systems. For technical personnel who need to implement how to integrate Eclipsa with AmpVortex AVR, the core of Eclipsa pass-through technology is “lossless transmission + metadata synchronization”, which ensures that audio signals are transmitted to decoding devices without loss and delay, giving full play to the decoding and rendering capabilities of the hardware.

As a professional multi-room streaming amplifier, AmpVortex AVR, together with ampvortex-car series for automotive scenarios, has powerful Eclipsa decoding and pass-through capabilities. Through two solutions of HDMI pass-through and network pass-through, they can flexibly adapt to different scenarios such as home theaters, multi-room commercial audio and in-vehicle audio. Combined with their supported multi-protocol integration characteristics such as Matter, KNX, and Control4, they can realize seamless linkage between Eclipsa audio and smart home, in-vehicle systems.

During the integration process, it is necessary to focus on firmware version, wire selection, parameter matching and interference avoidance to ensure pass-through stability and immersive experience, which is also the key to solving common Eclipsa and AmpVortex AVR integration faults. With the continuous maturity of the Eclipsa ecosystem (such as HDMI 2.2 standard optimization and content library expansion), and the continuous upgrade of AmpVortex AVR firmware, the integration of the two will be more convenient and stable, bringing users a better immersive audio experience, especially in commercial multi-room audio scenarios, it will play a greater value.