Iwan masjids (mosques) represent a milestone in the history of masjid architecture. This style was very common in the Mamluk state, which ruled Egypt between 1250 and 1517 CE. Due to its historical value, the present work investigates the effects of the architectural features of these masjids (closed and semi-closed) on their acoustic characteristics. Twenty masjids (9 semi-closed and 11 closed) were carefully selected. These masjids were subjected to detailed architectural and acoustic surveys. In the acoustic survey, room impulse responses were collected utilizing the integrated impulse response method in accordance with ISO, 3382-1:2009. The different architectural parameters and acoustic indicators for the investigated rooms were calculated based on the collected data. Results demonstrated a clear tendency to increase the reverberation in these buildings through increasing the room’s height thus its volume. In the semi-closed masjids, the average reverberation in the mid-frequency range, unoccupied, was found to be 1.86 s (decreasing to 1.29 s, when occupied) for an average volume of 1,659 m³. In the closed masjids, it was 1.54 s (decreasing to 1.11 s, when occupied) for an average volume of 1,995 m³. Results also showed a strong, positive, statistically significant, correlation and relationship between room volume and its mid-range reverberation. Based on these findings, it is recommended that the reverberation be augmented by increasing the volume per person; in all cases, this should not fall below 7.00 m³/person.

我要清真寺（清真寺）代表了清真寺建筑史上的一个里程碑。这种风格在马穆鲁克州非常普遍，该州在公元1250年至1517年之间统治着埃及。由于其历史价值，本研究调查了这些清真寺（封闭式和半封闭式）的建筑特征对其声学特性的影响。精心挑选了20个清真寺（9个半封闭和11个封闭）。这些清真寺经过了详细的建筑和声学调查。在声学调查中，根据ISO，3382-1：2009，使用集成的脉冲响应方法收集了房间的脉冲响应。根据收集的数据计算出所调查房间的不同建筑参数和声学指标。结果表明，通过增加房间的高度（从而增加房间的体积），可以明显提高这些建筑物的混响效果。在半封闭清真寺中，未占用的中频范围内的平均混响为1.86 s（占用时降低至1.29 s），平均音量为1,659 m³。在封闭的清真寺中，平均容积为1,995 m ³，为1.54 s（占用时减少至1.11 s）。结果还显示，房间音量与其中音混响之间具有强烈的，正的，统计学上的显着相关性和相关性。根据这些发现，建议通过增加每人的音量来增强混响效果。在任何情况下，均不应低于7.00 m ³ /人。