Why Your HDMI Extender Still Needs Extra Audio Cables — And How ARC Solves the Problem

The Hidden Problem in Modern AV Installations

When planning a professional AV system, most installers focus on one challenge first:

How can HDMI signals be transmitted over long distances without losing image quality?

The solution is usually straightforward:

Install an HDMI extender over Cat6 cable.

Video reaches the display.

The system works.

Project complete.

Or so it seems.

Many integrators discover a second problem only after installation:

The video arrives perfectly, but the audio cannot return from the display back to the sound system.

This issue is becoming increasingly common as Smart TVs and interactive displays are used in:

• Conference rooms

• Home theaters

• Hospitality environments

• Education facilities

• Digital signage networks

In these applications, the display is no longer just a monitor.

It has become a content source itself.

Why Audio Return Is Becoming More Important

Years ago, audio usually originated from devices such as:

• Blu-ray players

• Cable boxes

• Media players

• PCs

The signal path was simple:

Source → AV Receiver → Display

Today the workflow is different.

Many users watch content directly from:

• Netflix

• YouTube

• Disney+

• Smart TV applications

• Built-in media players

Now the audio originates inside the display.

This creates a new challenge.

How do you send that audio back to:

• Soundbars

• Amplifiers

• DSP processors

• AV receivers

especially when the display may be 40 to 70 meters away?

The Traditional Solution Creates More Problems

Many installations solve the issue by adding:

• Optical audio cables

• Additional audio extractors

• Audio converters

• Extra wiring infrastructure

While these solutions work, they create new challenges:

Increased Installation Cost

Additional equipment means additional budget.

More Complex Wiring

Installers must route separate audio cables alongside HDMI extension links.

Higher Failure Rates

Every additional device becomes another potential point of failure.

Difficult Maintenance

Future troubleshooting becomes more complicated because audio and video are traveling through different paths.

For large commercial AV projects, this complexity quickly adds up.

The Better Approach: Use ARC from the Beginning

ARC stands for Audio Return Channel.

Instead of installing a separate audio cable, ARC allows audio generated by the display to travel back through the same HDMI infrastructure.

This creates a cleaner and more efficient system architecture.

Benefits include:

• Fewer cables

• Faster installation

• Reduced hardware costs

• Easier maintenance

• Improved system reliability

For modern AV projects, ARC is no longer a luxury feature.

It is becoming a requirement.

How the GPro EX70H2 Solves the Problem

The GPro EX70H2 was designed specifically for modern AV environments where both long-distance video transmission and audio return are required.

Unlike traditional HDMI extenders that focus only on video distribution, the EX70H2 integrates ARC directly into the extension system.

This allows installers to extend video while simultaneously returning audio from the display.

Key Features

• HDMI 2.0

• 4K@60Hz 4:4:4 HDR

• HDCP 2.2

• ARC Support

• Bi-Directional PoE

• Bi-Directional IR

• Optical Audio Output

• HDMI Downscaling

• Up to 40m transmission at 4K60

• Up to 70m transmission at 1080P

The result is a complete AV extension solution rather than just a video transport device.

Real-World Application: Conference Room Deployment

Imagine a conference room with:

• A 98-inch interactive display

• Ceiling speakers

• Audio DSP processor

• Equipment rack located in a separate room

Employees frequently use:

• Microsoft Teams

• Zoom Rooms

• YouTube presentations

All audio originates from the display.

Without ARC:

An additional audio return cable must be installed.

With the EX70H2:

Video, control signals, and audio return can all be integrated into a streamlined infrastructure.

The installation becomes simpler and easier to maintain.

Real-World Application: Home Theater Systems

Homeowners increasingly prefer clean installations with hidden equipment racks.

However, streaming services are usually accessed directly from the TV.

This means audio must travel back to:

• AV receivers

• Amplifiers

• Soundbars

The EX70H2 allows installers to:

• Extend 4K HDR video over Cat6

• Return TV audio through ARC

• Control devices remotely through bi-directional IR

All while reducing visible cabling.

Additional Features That Simplify Installation

HDMI Downscaling

Not every display in a project supports 4K.

The built-in downscaler enables 4K and 1080P displays to coexist in the same system.

Bi-Directional PoE

Only one power adapter is required.

This reduces power requirements and simplifies deployment.

Bi-Directional IR Control

Users can control source devices from the display location or control displays from the equipment rack.

Perfect for professional AV installations.

Conclusion

Many HDMI extension projects focus only on transmitting video.

However, modern AV systems require much more than that.

As Smart TVs, conferencing displays, and streaming platforms become standard, audio return has become a critical requirement.

The GPro EX70H2 combines:

• Long-distance HDMI extension

• 4K60 HDR performance

• ARC audio return

• Bi-directional PoE

• Bi-directional IR control

into a single professional solution.

For system integrators, consultants, and AV installers, choosing an HDMI extender with ARC can significantly reduce installation complexity while improving overall system performance.