About 4-Acoustic – German Engineering. Premium Components. Global Manufacturing.
For more than 30 years, 4-Acoustic has been developing professional loudspeaker systems for live events, touring productions, DJs, musicians, clubs, restaurants, hotels and permanent installations.
Founded by electronics engineer Detlef Risse, 4-Acoustic combines German loudspeaker engineering with carefully selected premium components from leading European manufacturers. Today, 4-Acoustic products are used worldwide in festivals, concert venues, rental companies and commercial installations where reliability and sound quality are essential.
Every product is engineered in Germany and developed for demanding professional applications — from compact powered speakers to large-scale line array systems for audiences of more than 50,000 people.
40 Years of Pro Audio
The story of 4-Acoustic began more than four decades ago with a passion for electronics and live music. During his school years, founder Detlef Risse designed his first amplifiers, electronic crossovers and loudspeaker cabinets for local bands.
That passion evolved into professional education in electronics, years of practical experience in live sound reinforcement and eventually the foundation of 4-Acoustic Pro Audio Germany.
Today, Detlef Risse focuses almost exclusively on loudspeaker development, acoustic design, DSP optimization and product innovation. His experience from thousands of live events continues to shape every new generation of 4-Acoustic loudspeaker systems.
Designed in Germany. Manufactured in Our Own Factory. Quality Controlled by 4-Acoustic.
Since 2016, 4-Acoustic has been manufacturing its products in its own factory, Guangzhou Inline Audio Equipment Co., Ltd., located in Guangzhou, China.
Establishing our own manufacturing facility was a strategic decision to ensure complete control over production quality, technology and long-term product consistency. Today, every 4-Acoustic loudspeaker is manufactured under our own management and responsibility.
Unlike brands that rely on third-party OEM manufacturers, 4-Acoustic operates its own production facility with dedicated manufacturing processes, quality standards and engineering specifications developed by our team.
Our factory is exclusively focused on producing 4-Acoustic products. Cabinet manufacturing, electronics assembly, loudspeaker production, DSP integration, acoustic testing and final quality inspection are all carried out according to 4-Acoustic standards before products are shipped worldwide.
German Engineering — Designed in Germany
Every 4-Acoustic loudspeaker begins with engineering — not manufacturing.
Our development team in Germany is responsible for:
- acoustic simulation,
- cabinet design,
- waveguide development,
- crossover topology,
- FIR and DSP programming,
- mechanical construction,
- system measurements,
- long-term product testing.
Products are optimized for linear frequency response, consistent directivity and reliable operation under demanding live conditions.
Premium Components Without Compromise
Carefully Selected European Brand Components
Professional loudspeaker performance starts with component quality.
4-Acoustic combines proprietary cabinet design and DSP technology with carefully selected premium components from internationally respected European manufacturers.
Every component is chosen according to measurable performance criteria including sensitivity, power handling, thermal stability, distortion behaviour and long-term reliability.
Our Component Philosophy
| Component | Why We Choose It |
| Compression Drivers | High SPL capability, detailed high-frequency reproduction and long-term reliability. |
| Woofers | Powerful bass reproduction with low distortion and excellent transient response. |
| DSP Technology | FIR optimization, loudspeaker protection and system alignment. |
| Class-D Amplification | High efficiency, headroom and touring reliability. |
| Birch Plywood Cabinets | High rigidity, durability and optimized acoustic behaviour. |
Professional Sound Systems for Every Application
4-Acoustic develops loudspeaker systems for virtually any professional audio application.
Our Product Lines
|
Product Line |
Typical Applications |
| Touring Line Arrays | Festivals, concerts, arenas, city festivals. |
| Active Line Arrays | Open-air events, rental companies, touring. |
| PA speakers | DJs, musicians, event technology, corporate events. |
| Subwoofer | Live sound, clubs, touring, installations. |
| Multifunction Speaker | Stage monitors, side fills, live bands. |
| Built-in speakers | Hotels, restaurants, churches, conference rooms. |
| DSP & Power Amplifiers | Professional speaker management and system control. |
Our systems are modular and scalable—from a small club to a festival stage.
Used Around the World
Designed for Real Live Productions
4-Acoustic loudspeaker systems are used worldwide in demanding professional environments.
Typical Applications
|
Application |
Typical Users |
| Open-Air Festivals | Rental companies and festival organizers. |
| Touring Productions | FOH engineers and production companies. |
| DJs & Musicians | Mobile DJs, live bands and entertainers. |
| Clubs & Event Venues | Entertainment venues and nightlife locations. |
| Restaurants & Hotels | Permanent background music and speech systems. |
| Churches & Public Buildings | Speech intelligibility and distributed audio systems. |
| Commercial Installations | System integrators and architects. |
Sustainability and Responsibility
Long-lasting products are sustainable products.
That is why 4-Acoustic develops speakers designed for many years of professional use.
Our Quality Promise
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Spare Parts Supply.
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Repairability.
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Long-term product maintenance.
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Firmware and DSP updates.
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Rugged touring designs.
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Resource-efficient packaging.
We rely on durable materials instead of short-lived disposable products.
Why Professional Users Choose 4-Acoustic
Your Benefits at a Glance
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German Speaker Development.
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In-house production since 2016.
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High-quality European components.
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Professional DSP and FIR technology.
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Scalable line array systems.
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High-performance touring subwoofers.
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High speech intelligibility.
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Even sound distribution.
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Robust construction for touring and installation.
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Global sales and technical support.
Frequently Asked Questions
4-Acoustic Pro Audio Germany is a German professional loudspeaker brand owned by INLINE Marketing GmbH, headquartered in Ahlen, North Rhine-Westphalia, Germany.
Yes. Acoustic engineering, product development, DSP programming and product specifications are developed in Germany.
Since 2016, the majority of loudspeaker production has taken place in our own factory in Guangzhou with German engineering specifications and quality control procedures.
4-Acoustic combines German engineering with carefully selected premium loudspeaker components from leading European manufacturers, depending on the product series.
Festivals, concerts, touring productions, rental companies, DJs, musicians, hotels, restaurants, clubs, churches and commercial installations.
Yes. 4-Acoustic develops DSP solutions including FIR optimization, loudspeaker protection and amplifier integration for professional sound reinforcement systems.
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DETLEF RISSE
Technical Manager of Product Development
- Phone
- +49 2382 70870
- Office Address
- 4-Acoustic Pro Audio Germany
- INLINE Marketing GmbH
- Bunsenstr. 32, 59229 Ahlen, Deutschland