Powering
better sound
Class D audio amplifiers
H4SOUND develops innovative, highly efficient class D audio amplifiers using fully digital technology to modernize traditional PA and installed audio systems.
Who we are
H4SOUND grew out of a student team from the Digital Drive Control Laboratory at the School of Electrical Engineering, University of Belgrade. After representing Serbia at the IEEE International Future Energy Challenge 2024, the team established H4SOUND to continue developing advanced class D audio amplification technology.
Today, H4SOUND is focused on transforming traditional PA and installed audio systems through digitalization, improved energy efficiency, and intelligent network integration.
Our mission is to spread clear sound around the world by modernizing professional audio systems with efficient, reliable, and digitally controlled amplification technology.
We aim to make clear sound, intelligent control, and efficient audio distribution accessible across a wide range of professional environments.
Digital Drive Control Laboratory, University of Belgrade
Represented Serbia at IEEE IFEC 2024
PA and installed sound systems
Let’s work together
Discover how digitally implemented class D amplification can support more efficient, flexible, and network-ready audio installations.
Our technology
H4SOUND develops class D audio amplification solutions designed to combine high energy efficiency, clear sound reproduction, digital control, and flexible integration into modern professional audio environments.
Designed to deliver audio amplification with reduced energy losses and efficient power utilization.
Focused on high-quality audio reproduction with minimal distortion and reliable performance.
Compact amplification technology designed to simplify integration into professional audio installations.
Digital implementation supports flexible configuration, intelligent system integration, and advanced audio control.
Efficient
Clear
Connected
In development with JOYNED GmbH
In collaboration with JOYNED GmbH, H4SOUND is developing MilanCore++, a compact, DSP-driven active module designed to bring power, processing, amplification, and Milan networking to loudspeakers through a single Ethernet cable.
Using IEEE 802.3bt PoE++, MilanCore++ is designed to simplify professional audio installations by combining power delivery and network connectivity, reducing the need for separate power cabling in compatible applications.
Compact active module
Designed for integration into networked loudspeakers.
Integrated power delivery
IEEE 802.3bt support for compatible power and connectivity requirements.
DSP-driven processing
Integrated digital signal processing and amplification.
Milan networking
Networked audio for compatible professional audio systems.
Explore how H4SOUND’s approach to energy-efficient amplification and networked audio can support the next generation of professional sound installations.
Our engineering approach
H4SOUND focuses on developing digitally implemented class D audio amplification solutions that combine efficient power conversion, audio performance, and intelligent system integration.
01
Develop digital amplification solutions with a focus on efficient operation, sound quality, and flexible control.
02
Combine amplification, processing, power delivery, and networking to help simplify compatible audio installations.
03
Explore how modern amplification technology can support PA systems, commercial spaces, conference rooms, educational environments, and other professional audio applications.
Why choose us
H4SOUND combines digital class D amplification, efficient power utilization, and modern audio networking to help advance the design of professional sound systems.
Designed to deliver efficient audio amplification while reducing unnecessary energy losses.
Focused on clear audio reproduction and low-distortion performance.
MilanCore++ combines PoE++ power delivery, digital processing, amplification, and Milan networking in a compact module.
Power and network connectivity through a single Ethernet cable is intended to reduce installation complexity in compatible applications.
Digital implementation supports flexible configuration and integration with modern audio systems.
Built on experience from academic research, international competition, and ongoing product development.
Achievements
Second place at Serbia’s national Best Technological Innovation competition in 2024.
Our prototype was validated in the finals at the University of Texas at Austin, where it stood out with the best sound quality and the highest efficiency.
Collaboration
H4SOUND’s development journey includes collaboration with academic institutions, engineering teams, and professional audio partners.
MilanCore++ development collaboration
Professional audio collaboration
Industry collaboration
Academic roots
Project highlights
A look at the milestones behind H4SOUND’s engineering, audio technology, and approach to innovation.
01
H4SOUND began as the H-Bridges student team in the Digital Drive Control Laboratory and has been running its first pilot projects and installations since the beginning of 2026.
University of Belgrade · 2026
02
Together with JOYNED GmbH, H4SOUND is developing MilanCore++ to bring power, processing, amplification, and Milan networking to loudspeakers over a single Ethernet cable.
In collaboration with JOYNED GmbH
FAQs
Find answers to common questions about our technology, MilanCore++, and working with H4SOUND.
H4SOUND develops digitally implemented class D audio amplification solutions focused on energy efficiency, sound quality, and modern audio system integration.
MilanCore++ is a compact, DSP-driven active module under development by H4SOUND in collaboration with JOYNED GmbH. It is designed to combine power, processing, amplification, and Milan networking for compatible loudspeaker applications.
PoE++ can deliver power and network connectivity over a compatible Ethernet connection. This approach can reduce the need for separate power cabling in supported professional audio installations.
Milan is a networking technology for professional audio applications. It is designed to support interoperable networked audio systems using compatible equipment.
Potential applications include PA systems, houses of worship, corporate spaces, conference rooms, educational facilities, hospitality environments, and other professional audio installations.
MilanCore++ is under development. Please contact H4SOUND to discuss the current development status, potential applications, and collaboration opportunities.
You can book a meeting through our Calendly page or contact us directly by email or phone.
Contact us
Get in touch with H4SOUND to discuss our technology, MilanCore++, potential collaborations, or opportunities to modernize professional audio systems.
Visit or contact H4SOUND at our office in Belgrade, Serbia.
Kralja Milutina 17, Belgrade, Serbia
