TV Audio Setup: How to Choose the Best Audio Output Device

When setting up a TV audio system, Hi-Fi enthusiasts primarily aim to elevate the sound quality of television programming. Achieving pristine audio performance hinges on feeding the system the highest quality audio stream available.

Because audio stream delivery relies heavily on physical output interfaces, choosing different output ports or signal paths will yield drastically different listening experiences. Generally, you have two primary options for sourcing audio in a TV setup:

1. The Television Itself
2. Dedicated Media Source Devices

Below is a comprehensive analysis of both routing methods, their pros and cons, and potential pitfalls to watch out for.

Option 1: Outputting Audio Directly from the TV

Connecting your sound system directly to the TV’s audio output ports creates a fixed routing configuration. Once set up, you will not need to alter your physical wiring when switching content sources.

[ IPTV Box / Blu-ray ] ---HDMI---> [ Television ] ---Audio Out---> [ Amplifier / Active Speakers ]

How It Works

When the TV is powered on, any incoming audio/video stream from connected players is captured by the display. The TV’s internal audio processing circuitry reroutes the audio signal to its primary audio output interfaces (e.g., Optical, Coaxial, or HDMI eARC/ARC).

Advantages: Set-and-Forget Convenience

This approach offers maximum operational convenience and is ideal for users who prefer a permanent wiring setup:

• Effortless Source Switching: Switching between devices requires only changing the TV’s HDMI input via remote control. The audio output automatically follows the active visual source.
• Scalability: Adding a new media player later only requires connecting it to an open HDMI port on the TV. The connection to your amplifier or active speakers remains entirely untouched.

Disadvantages: Signal Compression & Opacity

Despite its convenience, routing through the TV introduces potential audio degradation:

• Uncertain Signal Integrity: Audio passing through the TV’s processing pipeline may undergo unexpected resampling, downmixing, or lossy compression.
• Lack of Technical Transparency: Internal circuit behavior varies by manufacturer and model. User manuals rarely document whether original bitstreams are preserved or altered prior to output, leaving audiophiles uncertain about signal purity.

Option 2: Outputting Audio directly from Media Source Devices

This method involves connecting your audio system directly to the specific media player (e.g., IPTV set-top box, Blu-ray player, or streaming box) rather than routing through the TV.

                         +---HDMI (Video Only)---> [ Television ]
                         |
[ IPTV / Media Player ] -+
                         |
                         +---Audio Out-----------> [ Amplifier / Active Speakers ]

Advantages: Maximum Signal Purity

• Direct Path Protection: Bypassing intermediate processing circuitry minimizes signal degradation and prevents unintended manipulation.
• Audio Transparency: Eliminating unneeded hardware stages reduces potential interference, ensuring the cleanest signal reaches your active speakers or amplifier.

Disadvantages: Reduced Convenience & Cable Compatibility

• Manual Re-cabling Required: If you frequently switch between multiple source devices, you must manually swap audio cables unless your amplifier features multiple switched inputs.
• Interface Disparities: Media devices vary widely in output selection (e.g., optical vs. analog RCA). Adding new source hardware may require purchasing specialized interconnect cables.

Real-World Case Study: Diagnosing HDMI Compression Issues

During a recent system installation, a severe audio anomaly was encountered when using an IPTV set-top box’s HDMI output.

The Setup & Symptom

The IPTV box was connected directly to the TV via HDMI, with the TV’s Audio Out feeding an amplifier paired with high-performance woofer drivers.

Despite having robust amplification and capable speakers, the resulting audio quality suffered severe degradation—sounding virtually indistinguishable from the TV’s tiny built-in speakers.

Troubleshooting Process

1. Initial Hypothesis (TV Processing Issue): To test if the TV’s internal circuitry was altering the signal, the IPTV box’s HDMI output was connected directly to the amplifier.
2. Finding: The sound quality remained equally degraded, confirming the issue originated prior to the TV.
3. Root Cause Identified: The IPTV box’s HDMI port was severely compressing all outgoing audio signals at the firmware level.

The Solution

Switching the connection from the IPTV box’s HDMI port to its dedicated analog line-out allowed the TV audio system to perform at its full capability, delivering clean, full-range dynamic sound.

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| Key Takeaway: Poor sound quality is not always caused by the TV or audio equipment.    |
| Source devices themselves can introduce hidden digital bottlenecks or firmware bugs.  |
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Buyer’s Advice for Audiophiles

To avoid unforeseen compatibility bugs and hardware limitations:

• Choose Popular Models: Purchase media source devices and set-top boxes with established user bases.
• Faster Firmware Fixes: High-volume products receive active manufacturer maintenance, ensuring software defects and audio issues are patched quickly.
• Verify Audio Out Specs: Before purchasing equipment priced from $50 to $500+ (approx. ¥350 to ¥3,500+), verify its supported audio bitstreams and physical output options.