There is a specific acoustic problem that shows up in almost every mosque, and it is directly at odds with what makes mosques beautiful to look at. Domed ceilings, smooth marble floors, plastered walls, tall atriums, these architectural features are acoustically harsh. They reflect sound in every direction and create long reverberation tails that turn the imam’s words into a wash of overlapping echoes.
In a room designed for music, some reverberation is desirable. In a room designed for speech, for Quranic recitation and khutbah, it is a real problem. Worshippers at the back of a large prayer hall can struggle to follow what is being said, not because of any electronics issue, but because the architecture itself is working against them.
Oman’s mosque construction programme under Vision 2040 is substantial. New mosques are being built across the Sultanate, from neighbourhood masjids in Muscat’s expanding suburbs to large congregational mosques in Nizwa, Sohar, Salalah, and beyond. Each one presents an opportunity to get the acoustics right from the start, something much easier and cheaper to do during construction than as a retrofit.
Why Mosque Acoustics Are Different
The acoustic target for a mosque is quite specific. Speech intelligibility needs to be high across the entire prayer hall, including areas far from the mihrab. At the same time, the space needs to support Quranic recitation, which benefits from a degree of warmth and resonance, but not the kind of long, diffuse reverberation you’d want in a concert hall.
The usual metric acousticians use is the Speech Transmission Index (STI), where a score above 0.6 is considered good for speech intelligibility. Many mosques, particularly larger ones with domed structures, fall below this without acoustic treatment. The larger the volume and the harder the surfaces, the worse it gets.
A standard reverberation time (RT60) target for mosque prayer halls is typically 1.2–1.8 seconds, depending on the size of the space. Below 1.0 seconds and the space feels dead and uninviting. Above 2.0 seconds and clarity suffers significantly. Hitting this range in a large domed space requires careful material selection and placement.
The Architectural Challenges Specific to Omani Mosque Design
Traditional Omani mosque architecture favours geometric precision, natural stone and marble finishes, ornate tilework, and the characteristic dome-and-minaret profile. All of these are acoustically reflective. The dome in particular is problematic, a smooth hemispherical surface focuses reflected sound into specific zones, creating areas of very high sound intensity surrounded by areas where it is much quieter.
The mihrab recess, while architecturally significant, also creates sound reflection patterns that can cause interference between the direct voice and the reflected signal, sometimes making speech harder to understand at moderate distances even when the imam is projecting clearly.
The solution is not to strip out the architecture. It is to add absorption strategically in locations where it reduces reflections without affecting the visual character of the space.
Practical Solutions That Work Within Islamic Architectural Tradition
Acoustic spray plaster applied to dome interiors is one of the most effective tools available for large mosque spaces. Materials like Sonoglass can be applied directly to concrete or masonry dome surfaces, providing significant absorption without visible alteration of the form. From below, the dome looks the same. Acoustically, it behaves very differently.
For walls, fabric acoustic panels in neutral tones, cream, ivory, soft green, can be specified in dimensions and placement that align with the existing geometric patterns of the space. When integrated into the interior design from the beginning, they are essentially invisible as acoustic elements. They read as part of the wall, not as an add-on.
Prayer carpets provide meaningful floor-level absorption, particularly for mid and high frequencies. Dense pile carpets perform better than thin machine-made versions. In mosques where carpet selection is part of the interior design brief, this is worth specifying explicitly rather than leaving to the furniture contractor.
Sound system design cannot be separated from room acoustics. A high-quality distributed speaker system can compensate for some acoustic shortfalls, but only up to a point. Trying to achieve speech clarity entirely through amplification in a reverberant room produces louder confusion rather than clearer speech. The room needs to be treated first, and the system designed around it.
Getting the Brief Right
The time to bring in acoustic consultants is at the design stage, not after construction. By the point walls are plastered and floors are tiled, the options are more limited and more expensive. A pre-construction acoustic simulation, using the architectural drawings to model the predicted reverberation time and STI across the prayer hall, allows the design team to make informed decisions about material choices before anything is built.
Akinco works with mosque projects across Oman, from initial acoustic modelling to supply and installation of treatment materials. If you are working on a mosque project and want to understand what acoustic performance is achievable within the architectural brief, a consultation at the design stage is the most useful starting point.
