The CAHRISMA project (Conservation of the Acoustical Heritage by the Revival and Identification of the Sinan’s Mosques Acoustics) investigates, among other things, the acoustics in some of the old churches and mosques in Istanbul. The present paper deals with acoustic computer simulations and in particular comparison between In-situ recordings and auralization obtained from simulations carried out in the Odeon program. Three of the rooms in the project-Sokullu, Süleymaniye and Saint Irene, were compared.

Two types of In-situ recordings have been made, one directly recorded in the room with a person performing, and another where measured binaural room impulse responses (BRIR) have been convolved with anechoic recordings. These two types of recordings have been compared with simulated auralizations in selected positions. The rooms in the comparison vary in size and reverberation time.