When it comes to soundproofing, acoustic caulk is often recommended to seal gaps and cracks around doors, windows, and walls. It prevents sound from leaking through small openings and helps create a quieter environment. But what if you don’t want to use acoustic caulk, or you’re looking for alternatives?

In this article, we’ll explore some effective substitutes for acoustic caulk and show you how Guangdong Leeyin Acoustics can help you achieve superior sound control with professional acoustic solutions.

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Why Acoustic Caulk Matters in Soundproofing

Sound travels through the smallest gaps. Even if you install acoustic panels or soundproof walls, unsealed joints can reduce the effectiveness of your setup. Acoustic caulk is flexible, durable, and specifically designed to block airborne noise.

But if it’s not available—or if you’re looking for different solutions—there are alternatives.

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Best Alternatives to Acoustic Caulk

1. Weatherstripping

• Great for sealing around windows and doors.

• Easy to apply and affordable.

• Provides both sound insulation and energy efficiency.

2. Expanding Foam Sealant

• Useful for filling larger cracks or gaps in walls.

• Expands to cover irregular spaces.

• Provides decent noise reduction but is less flexible than caulk.

3. Mass Loaded Vinyl (MLV)

• While not a direct caulk replacement, MLV can block sound when applied to walls, floors, or ceilings.

• Often combined with acoustic panels for better results.

4. Door Sweeps and Seals

• Block the gap at the bottom of doors where sound often escapes.

• An excellent low-cost solution for rooms needing quick soundproofing.

5. Acoustic Panels and Wood Slat Wall Panels

• Instead of focusing only on sealing gaps, you can treat the room with high-performance acoustic panels.

• Wood slat wall panels from Guangdong Leeyin Acoustics absorb sound, reduce echoes, and improve overall room acoustics—making them an effective and stylish alternative or complement to acoustic caulk.

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Why Choose Guangdong Leeyin Acoustics

At Guangdong Leeyin Acoustics, we specialize in wood slat wall panels and acoustic panels that not only absorb sound but also elevate the design of your space.

• Industry Leadership: A leading exporter of wood slat wall panels in China.

• Advanced Manufacturing: 20,000㎡ modern production facility with cutting-edge technology.

• Quality Standards: Products meet E0 MDF, PET recyclability, and FSC compliance, ensuring eco-friendly and safe solutions.

• Trusted Globally: Supplying acoustic products worldwide with a reputation for quality and innovation.

 

Whether you’re soundproofing a home, office, or professional studio, our panels provide a long-lasting, aesthetically pleasing solution that goes beyond what caulk alone can achieve.

Soundproofing a room is becoming increasingly important in today’s busy world. Whether you want to reduce outside noise, improve your home theater, or create a peaceful recording studio, soundproofing can transform your space. But one common question people ask is: What is the cheapest material to soundproof a room?

In this article, we’ll explore cost-effective soundproofing options and why investing in quality acoustic materials—like those from Guangdong Leeyin Acoustics—can be the best long-term solution.

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Affordable Materials for Soundproofing

1. Thick Curtains or Moving Blankets
   Heavy curtains or blankets can absorb some sound and are a low-cost way to reduce echo. While they won’t provide complete soundproofing, they are useful for renters or anyone on a tight budget.

2. Carpets and Rugs
   Hard floors reflect sound, creating more noise. Adding thick rugs or carpets can help absorb sound waves and reduce reverberation at a minimal cost.

3. Egg Cartons (Myth vs. Reality)
   Many people believe egg cartons can soundproof a room. While they might slightly scatter sound, they do not provide real noise reduction. They are not recommended as a serious solution.

4. DIY Acoustic Panels
   Some people build panels using wood frames, insulation, and fabric. This method is affordable but requires time, tools, and skill.

5. Acoustic Foam and Panels
   Among cost-effective and efficient solutions, acoustic wall panels and foam panels are some of the best choices. They are not only affordable but also highly effective in reducing noise and improving sound clarity.

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Why Acoustic Panels are the Best Value

While thick fabrics and rugs can help, acoustic panels offer the best balance between affordability, durability, and performance. Compared to temporary solutions, panels provide:

• Higher Noise Reduction: Designed specifically to absorb sound waves.

• Aesthetic Appeal: Wood slat acoustic panels, like those from Guangdong Leeyin Acoustics, combine modern style with excellent acoustic performance.

• Longevity: Unlike cheap DIY fixes, quality panels last for years with minimal maintenance.

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About Guangdong Leeyin Acoustics

At Guangdong Leeyin Acoustics, we specialize in producing wood slat wall panels and acoustic panels that are exported worldwide. As one of the leading exporters of wood slat wall panels in China, our company combines innovation with strict quality standards.

 

• 20,000㎡ Modern Factory – Equipped with advanced machinery and strong production capacity.

• International Standards – All products are manufactured with strict quality management systems.

• Expertise in Acoustic Solutions – From homes to professional studios, we deliver solutions tailored to client needs.

When it comes to improving sound quality in a room, one of the most common solutions people consider is installing acoustic wall panels. But do these panels actually dampen sound, or is their function more about aesthetics? Let’s break it down.

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What Does “Dampen Sound” Mean?

In acoustics, “dampening” usually refers to reducing echoes, reverberation, and noise reflections inside a space. Unlike full soundproofing, which blocks sound from entering or leaving a room, acoustic wall panels are designed to absorb sound energy and improve the acoustic environment within a room.

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How Acoustic Wall Panels Work

Acoustic panels, especially wooden slat acoustic panels with PET felt backing, use a combination of materials to trap and dissipate sound waves.

• PET Felt Backing: Made from recycled polyester, PET felt absorbs mid-to-high frequency sounds, reducing echo and background noise.

• Wooden Slats: Slatted designs help scatter sound waves, balancing absorption with diffusion for a natural sound experience.

• Thickness and Placement: Proper thickness and strategic placement on walls or ceilings maximize their performance.

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Do Acoustic Panels Really Reduce Noise?

Yes—acoustic wall panels dampen sound within a room by:

✅ Reducing echo and reverberation
✅ Improving speech clarity and listening comfort
✅ Enhancing sound quality for home studios, offices, restaurants, and auditoriums

However, it’s important to note that acoustic panels do not block sound transmission between rooms. For full soundproofing, additional materials such as mass-loaded vinyl, insulation, or double-layered walls are needed.

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Why Choose Wooden Slat Acoustic Panels?

Compared with traditional fabric or foam panels, wooden slat acoustic panels offer both performance and aesthetics:

 

• High Acoustic Absorption – Effective NRC (Noise Reduction Coefficient) ratings.

• Sustainable Materials – PET felt backing made from recycled plastics.

• Stylish Design – Natural wood finishes that elevate interiors.

• Safe and Durable – Low formaldehyde MDF (E0 standard) and FSC-certified wood.

When it comes to installing acoustic wall panels, one of the most common questions is: Should you screw or glue them to the wall? Both methods are widely used, but the right choice depends on your wall type, the panel design, and whether you want a permanent or removable solution. Let’s break it down.

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🔧 Screwing Acoustic Panels

Pros:

• Provides a strong, secure hold

• Ideal for heavy or large wood slat acoustic panels

• Suitable for uneven or textured walls

• Easy to remove and re-install without damaging the panel

Cons:

• Requires drilling holes into the wall

• May leave marks if you remove the panels later

👉 Best for: Permanent installations or when mounting panels on drywall, brick, or concrete.

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🟫 Gluing Acoustic Panels

Pros:

• Quick and easy installation without tools

• No visible screws or hardware

• Perfect for lightweight PET acoustic panels

Cons:

• Creates a permanent bond (hard to remove without damaging walls)

• Less effective on rough or dusty surfaces

• May not hold up well for heavier wood slat panels

👉 Best for: Temporary setups or smooth surfaces like painted drywall.

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🏆 What’s the Best Option?

• If you want flexibility and the option to re-arrange panels in the future, screws are the safer choice.

• If you want a fast, seamless look and don’t plan to move the panels, glue is a convenient option.

At Guangdong Leeyin Acoustics, our wood slat acoustic panels and PET felt panels are designed for both installation methods, giving you the flexibility to choose based on your project needs.

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🎶 Professional Advice from Guangdong Leeyin Acoustics

As a leading manufacturer and exporter of wood slat wall panels and acoustic panels in China, we provide expert guidance on installation, ensuring our clients achieve the best acoustic performance with the easiest installation methods.

Why Choose Us?

• 20,000㎡ modern production facility with advanced equipment

• High production capacity for global supply

• Strict international quality management standards

• Expertise in eco-friendly PET, premium MDF, and FSC-certified materials

 

Our panels are not only functional but also stylish, making them the perfect choice for homes, offices, studios, and commercial projects worldwide.

When it comes to improving sound quality in a room, two common solutions come to mind: acoustic foam and acoustic panels. While both are designed to manage sound, they are not the same—and choosing the right one depends on your specific needs. So, which is better: acoustic foam or acoustic panels? Let’s take a closer look.

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🎵 What is Acoustic Foam?

Acoustic foam is a lightweight, soft, porous material often cut into wedge or pyramid shapes. It’s typically used to absorb mid to high-frequency sounds and reduce echo.

✅ Pros of Acoustic Foam:

• Affordable and widely available

• Easy to install (usually with adhesive)

• Good for controlling high-frequency reflections

❌ Cons of Acoustic Foam:

• Limited effectiveness for low-frequency sounds (bass)

• Often less durable and harder to clean

• Basic appearance—may not suit modern interior design

👉 Best for: Small home studios or practice rooms where budget is the main concern.

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🪵 What are Acoustic Panels?

Acoustic panels, like our wooden slat acoustic panels and PET felt panels, are high-performance solutions designed to absorb a wider range of frequencies while also serving as stylish wall finishes.

✅ Pros of Acoustic Panels:

• Effective for both mid and low-frequency absorption

• Premium aesthetics—adds elegance to interiors

• Made with durable, eco-friendly materials (MDF, PET, FSC-certified wood)

• Suitable for homes, offices, theaters, and recording studios

❌ Cons of Acoustic Panels:

• Higher initial cost compared to foam

• Requires more careful installation (screws or glue)

👉 Best for: Professional studios, home theaters, offices, and modern living spaces where both performance and design matter.

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⚖️ Acoustic Foam vs Acoustic Panels: Which is Better?

 

👉 Verdict: If you want professional sound control, durability, and modern style, acoustic panels are the better choice. Foam may work for small, budget-conscious setups, but panels deliver long-term value.

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🏆 Why Choose Guangdong Leeyin Acoustics?

At Guangdong Leeyin Acoustics, we specialize in manufacturing wood slat acoustic panels and other sound solutions that combine functionality and aesthetics.

• 20,000㎡ modern factory with advanced production capacity

• Strict international quality management standards

• Expertise in E0-grade MDF, recyclable PET, and FSC-certified wood

• Leading exporter of wood slat acoustic panels in China

Our panels are not just about sound absorption—they transform interiors into sophisticated, comfortable, and acoustically balanced spaces.

When it comes to soundproofing a room, one material that often comes up is mass-loaded vinyl (MLV). Known for its dense yet flexible structure, MLV has been widely used in construction and interior design projects to block sound transmission. But the real question is: Is mass-loaded vinyl good for soundproofing, and should you use it in your project?

In this article, we’ll explore the pros and cons of MLV, how it compares with acoustic panels, and why Guangdong Leeyin Acoustics offers smarter alternatives with wood slat wall panels and advanced acoustic solutions.

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🎯 What is Mass-Loaded Vinyl (MLV)?

Mass-loaded vinyl is a dense, flexible material made from vinyl and metal particles. Its key characteristic is its high mass-to-thickness ratio, which makes it effective at reducing airborne sound transmission through walls, ceilings, and floors.

It is often installed:

• Inside wall cavities

• Behind drywall

• Under floors

• Beneath ceilings

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✅ Benefits of Mass-Loaded Vinyl

1. Effective Sound Barrier
   MLV blocks airborne noise, making it suitable for walls that face traffic, neighbors, or mechanical noise.

2. Thin Yet Dense
   Compared to building extra walls or using heavy concrete, MLV provides high sound-blocking performance without adding significant bulk.

3. Versatile Applications
   Can be applied in residential, commercial, and industrial projects.

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❌ Limitations of Mass-Loaded Vinyl

1. Not a Complete Solution
   MLV reduces sound transmission but does not absorb sound inside the room. This means echo and reverberation will still exist without acoustic panels.

2. Installation Challenges
   MLV can be heavy and difficult to handle, often requiring professional installation.

3. Cost Factor
   High-quality MLV can be expensive, especially for larger spaces.

4. Limited Aesthetic Value
   MLV is typically hidden behind walls and does not contribute to interior design.

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🔎 MLV vs. Acoustic Panels

While MLV blocks sound, acoustic panels absorb sound. For a truly effective soundproofing solution, both blocking and absorbing are necessary.

• Use MLV → To prevent outside noise from entering or inside noise from escaping.

• Use Acoustic Panels → To reduce echo, improve clarity, and enhance room acoustics.

At Guangdong Leeyin Acoustics, our wood slat acoustic panels combine functional sound absorption with modern interior design, making them ideal for studios, offices, restaurants, and luxury homes.

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🏭 Why Choose Guangdong Leeyin Acoustics?

As a global leader in wood slat wall panels and acoustic solutions, Guangdong Leeyin Acoustics goes beyond traditional materials like MLV by offering products that are:

 

• Sustainable & Certified – Our panels use eco-friendly materials that comply with E0 and FSC standards.

• Design-Driven – Beautiful finishes that enhance any interior while providing acoustic benefits.

• High-Performance – Engineered to control echo, reduce reverberation, and improve sound quality.

• Backed by Expertise – With 20,000㎡ of advanced factory space and strict international quality management, we ensure world-class acoustic solutions.

If you're looking to reduce noise in your space, whether for a home office, recording studio, or commercial setting, acoustic panels are an excellent solution. But one of the most common questions we hear is:
“How many acoustic panels do I need to soundproof a room?”

At Guangdong Liyin Acoustics Technology Co., Ltd.( Leeyin ) , we specialize in high-performance wooden slat acoustic panels, and we’re here to help you make the right decision for your acoustic project.

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🎯 Understanding the Purpose of Acoustic Panels

Before calculating quantity, it's essential to understand that acoustic panels absorb sound—they don’t completely block it like traditional soundproofing materials. They’re primarily used to:

• Minimize echo and reverberation

• Improve sound clarity

• Reduce noise levels within a room

For full soundproofing, a combination of materials (mass-loaded barriers, insulation, and sealing gaps) may be required. However, strategically placing acoustic panels significantly improves perceived sound quality and reduces noise transmission.

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📏 How to Calculate the Right Number of Acoustic Panels

Here’s a basic step-by-step guide:

1. Measure the Room Size

Determine the length × width × height of your room to get the total cubic space.

2. Calculate Wall Surface Area

Focus on the four walls (and ceiling if needed). Remove doors/windows from your calculation.

3. Determine Coverage Percentage

Depending on the purpose, typical coverage recommendations are:

4. Standard Panel Size Reference

At Liyin Acoustics, our standard wood slat acoustic panel is typically:

• Width: 600 mm (23.6")

• Height: 2400 mm (94.5")

• Coverage Area per Panel: ~1.44 m²

For example:
If you want to cover 12 m² of wall space, you would need approximately 8–9 panels.

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🧠 Expert Tip: Placement Is Just as Important

Rather than covering 100% of the walls, strategic placement helps maximize performance:

• First reflection points (side walls)

• Back wall and front wall (behind speakers or workspace)

• Ceiling if echo is still present

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🪵 Why Choose Liyin Acoustic Panels?

As a leading manufacturer and exporter of wood slat acoustic panels in China, Guangdong Liyin Acoustics Technology Co., Ltd. brings professional quality to every project.

🌟 Our Advantages:

 

• ✅ 20,000 m² modern factory with precision equipment

• ✅ PET felt backing for superior sound absorption

• ✅ Made with E0-grade MDF and FSC-certified wood veneer

• ✅ Fire-rated and low formaldehyde emissions

• ✅ OEM/ODM customization for size, color, and finish

• ✅ Global export reach to Europe, North America, and Southeast Asia

When it comes to improving sound quality in a room—whether it’s an office, studio, home theater, or commercial space—acoustic panels are an essential solution. But one of the most common questions we hear is:
“Should acoustic panels go on the walls or the ceiling?”

The short answer? Both can be effective depending on your acoustic goals. In this blog post, we’ll explore the differences, benefits, and ideal placements of acoustic panels—especially our signature wood slat acoustic panels from Guangdong Liyin Acoustics Technology Co., Ltd.

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✅ Wall-Mounted Acoustic Panels

📌 Why Install Acoustic Panels on Walls?

• Primary reflection points: Walls are often the first surfaces where sound waves bounce, creating echoes and muddying audio clarity.

• Improved speech intelligibility: Reducing side wall reflections makes spoken words more crisp and clear—essential in offices and meeting rooms.

• Ideal for small to medium-sized rooms: Most sound reflections occur horizontally in typical spaces.

✔ Best Placement on Walls:

• At ear level in seating positions

• Behind or beside speakers

• On opposite walls for balanced absorption

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✅ Ceiling-Mounted Acoustic Panels

📌 Why Install Acoustic Panels on Ceilings?

• Tackling vertical reflections: Ceilings reflect sound waves just like walls, especially in large rooms with high ceilings.

• Open spaces benefit most: Conference rooms, restaurants, and atriums often require overhead absorption to reduce ambient noise.

• Better low-frequency control: Hanging baffles or ceiling clouds can improve low-end absorption and reduce flutter echo.

✔ Best Ceiling Applications:

• Above central seating areas

• Suspended panels (clouds) for visual effect + sound control

• In open-plan offices or multi-functional public spaces

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🪵 Why Choose Liyin’s Wood Slat Acoustic Panels?

At Guangdong Liyin Acoustics Technology Co., Ltd.( Leeyin ) , we design and manufacture premium wood slat acoustic panels with PET backing—ideal for both wall and ceiling installations.

💼 Our Core Advantages:

• 🔧 Versatile Application – Easily mounted on walls or ceilings with screws, glue, or mounting rails

• 🌿 Eco-Friendly Materials – Made with PET felt, E0 MDF, and FSC-certified wood veneer

• 🔥 Fire-Rated & Formaldehyde-Free – Meets international safety standards

• 🏢 20,000 m² Production Facility – Backed by modern equipment and efficient logistics

• 🌍 Global B2B Supplier – Exported to Europe, North America, Southeast Asia, and more

• 🛠️ OEM/ODM Services – Custom sizes, colors, and finishes for your project needs

Whether you're treating a recording studio wall or creating a stylish sound-absorbing ceiling feature in a hotel lobby, our acoustic panels are engineered for aesthetics and performance.

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🎯 Final Takeaway: Walls, Ceilings… or Both?

The best acoustic treatment strategy considers both surfaces. Start with walls for first reflections, then consider ceilings for additional control—especially in large or open rooms.

 

Liyin Acoustics panels are engineered to perform beautifully on either surface, allowing you to create an environment that both sounds and looks exceptional.

 

A Guide to Choosing the Best Acoustic Panel Materials for Superior Sound Performance

Acoustic panels play a crucial role in managing sound reflections, reducing echo, and improving speech clarity in various environments—from offices and conference rooms to hotels, classrooms, and residential spaces. But one of the most frequently asked questions is:
“What material should I use for acoustic panels?”

Whether you are designing a new commercial space or improving acoustics in a recording studio, choosing the right materials is key to ensuring both performance and aesthetics. In this article, we’ll break down the most effective acoustic panel materials and introduce a professional-grade solution from Guangdong Liyin Acoustics Technology Co., Ltd. (Leeyin) 

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🧱 Common Materials Used in Acoustic Panels

1. Mineral Wool (Rockwool)

Widely used for its excellent sound absorption and fire resistance, mineral wool is one of the top choices for acoustic insulation. It's dense, porous, and ideal for wall-mounted panels and ceiling treatments.

Pros: High NRC (Noise Reduction Coefficient), fire-safe
Use case: Studios, theaters, industrial spaces

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2. Fiberglass Insulation

Similar to mineral wool but lighter, fiberglass offers effective acoustic dampening while also being thermally insulating. It must be enclosed in fabric for safety.

Pros: Lightweight, effective absorption
Use case: Offices, schools, conference rooms

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3. Acoustic Foam

Often seen in home studios, foam panels come in pyramid or wedge shapes to scatter and absorb mid to high frequencies.

Pros: Lightweight, easy to install
Cons: Limited performance for low frequencies
Use case: Podcasts, gaming setups, small rooms

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4. PET Felt (Recycled Polyester Fiber)

An increasingly popular eco-friendly option, PET felt is lightweight, durable, and available in a variety of colors. It is also highly versatile and used in premium wood slat panels.

Pros: Sustainable, customizable, good acoustic performance
Use case: Modern interiors, commercial projects, B2B applications

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5. Fabric-Wrapped Panels

Fabric acts as a breathable cover that allows sound to penetrate to the absorbing core (mineral wool or fiberglass). These panels are versatile in design and performance.

Pros: Professional appearance, design flexibility
Use case: Auditoriums, offices, hotels

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🌟 Premium Material: Wood Slat Acoustic Panels with PET Backing

At Guangdong Liyin Acoustics Technology Co., Ltd., we specialize in wood slat acoustic panels with PET felt backing—a premium acoustic solution that combines natural aesthetics with high acoustic performance.

Why Choose Our Panels?

• ✅ Made with eco-friendly, fire-rated PET felt

• ✅ Premium MDF or veneer slats for modern wood grain finishes

• ✅ NRC-rated for sound absorption efficiency

• ✅ Easy to install via glue, screws, or mounting systems

• ✅ Perfect for walls and ceilings in commercial interiors

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🏭 Backed by World-Class Manufacturing

With 20,000m² of modern production facilities and advanced equipment, Liyin Acoustics stands out as one of China’s top exporters of acoustic and wood slat wall panels.

We Offer:

• 🔧 OEM/ODM acoustic panel solutions

• 🌍 Export to Europe, North America, Southeast Asia, and beyond

• 🛠 Strict quality control according to international standards

• 🧱 Fast production & logistics support for large-scale projects

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🧠 Final Thoughts: Match Material to Your Project

Choosing the right material depends on your project’s acoustic goals, budget, and visual requirements. While foam and DIY options may suit basic needs, professional-grade materials like PET felt and engineered wood slats provide superior performance and finish.

 

If you're seeking high-performance, aesthetically pleasing, and eco-conscious acoustic solutions, Guangdong Liyin Acoustics Technology Co., Ltd. is your trusted partner.

 A Guide to Standard Dimensions and Custom Options

Akupanels—also known as wood slat acoustic panels—have become a popular design solution for those looking to combine style and sound control in modern interiors. Whether you're a homeowner, architect, or interior designer, understanding the standard size of Akupanels is essential for accurate project planning.

In this article, we’ll answer the common question:
What size is the Akupanel?
We’ll also explore why working with Guangdong Liyin Acoustics Technology Co., Ltd. (leeyin)  gives you the flexibility and reliability you need when sourcing premium-quality wood slat acoustic panels.

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📏 Standard Akupanel Dimensions

The most commonly accepted standard size for Akupanel products is:

• Height: 2400 mm (94.5 inches)

• Width: 600 mm (23.6 inches)

• Thickness: 21 mm (0.83 inches)

This size is ideal for floor-to-ceiling applications in most residential and commercial interiors. It allows for quick installation, minimal waste, and a seamless modern look when multiple panels are installed side by side.

At Liyin Acoustics, our Akupanels are designed with these universal dimensions in mind, ensuring compatibility across various markets and project types.

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🛠️ Material Composition and Build

Liyin Akupanels consist of three core components:

• Solid or veneered MDF slats

• Eco-friendly PET felt backing (made from recycled materials)

• Premium finishes such as natural oak, walnut, or custom laminates

This construction not only ensures excellent sound absorption, but also makes the panels durable and easy to install or modify.

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🔄 Custom Size Options Available

While 2400 x 600 mm is the standard size, Guangdong Liyin Acoustics Technology Co., Ltd. offers custom size options to suit your specific design or architectural needs.

Some of our customizable size services include:

• Shorter lengths for half-wall applications

• Narrower widths for columns, beams, or detailed installations

• Custom-cut panels for ceilings or sloped walls

• Large-format panels for seamless commercial projects

Just send us your specifications—we can manufacture to your needs with precision and consistency.

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🌍 Why Choose Liyin Acoustics for Your Akupanel Needs?

Guangdong Liyin Acoustics Technology Co., Ltd. is a leading manufacturer and exporter of wood slat acoustic panels in China. With a 20,000 m² modern production facility and a commitment to international quality standards, we offer unmatched reliability in both production capacity and product consistency.

Our key advantages include:

• Advanced CNC machining and lamination systems

• ISO-compliant quality control for every production line

• Professional OEM/ODM services for global partners

• Fast lead times and strong export experience

• Custom finishes, sizes, and installation accessories available

 

Whether you're sourcing standard-size panels or need a fully tailored acoustic solution, Liyin is the trusted partner for acoustic excellence.