Decibel's research and development department is headed by PhD eng. Tsvetan Nedkov with thesis defense on "Research and Development of methods and algorythsms for calculating the transmission loss of partitions for concert halls and recording studios". Mr. Alexander Kirechev, a PhD student on "Methods and algorithms for the study of active and passive sound-reducing systems and sound insulation materials" at the Technical University of Sofia, has also contributed to the department's work. In the development of new products, Decibel has successfully collaborated with the Department of Physics at University of Architecture, Civil Engineering and Geodesy, the Department of Radio and Telecommunications at the Technical University of Sofia and the Polymer Engineering Department at University of Chemical Technology and Metallurgy, Sofia.

DECIBEL's own studies include: 

- MUTE SYSTEM composite system with published results at the international scientific conference ICEST 2014, held in Nis, Serbia

- Multilayer composite soundproofing panels for walls, published on CEMA 2015

- development of industrial chevron silencers published in IJETCAS International Journal 2015

- modeling of acoustic systems with "finite element method" with published results at ICEST 2016 international conference in Sofia, Bulgaria

- designing and manufacturing of a reduced silencer chamber for testing samples in a physics laboratory at UACEG, reported at a scientific conference at UACEG, Sofia, 2014.

- experimental and numerical study of influence of elastic porous material to coincidence frequency of a composite wall structure, science article for Bulgarian Academy of Science (BAS)

- influence of hardness and damping factor of porous material upon generated drum sound from impact of metal disk and metal plate, presented at International conference – IcETRAN, Serbia, 2017

- development and realization of multilayered thin sound reduction panel for existing walls, presented at International conference – IcETRAN, Serbia, 2017

- model of simplified calculation of characterizes of sound insulation with composite slab in situations of impact noise, published in IJETCAS International Journal 2018

From the development department, the following Decibel products have been successfully researched and implemented:

- MUTE SYSTEM 20

- MUTE SYSTEM 30

- MUTE SYSTEM 35

- C-MUTE SYSTEM

- F - MUTE SYSTEM

- DECIBEL L, LW - industrial chevron silencers

- Perforated acoustic panels ACER, CIRCULO and WAVO

- Acoustic wall panels with textile and flock cover 

- MUTE SYSTEM 23

- MUTE SYSTEM 33

- MUTE SYSTEM 63

- C - MUTE SYSTEM 23

- C - MUTE SYSTEM 33

- C - MUTE SYSTEM 63

- F - MUTE SYSTEM 23