Gamelan music differs from Western classical music in two fundamental ways - in the characteristics of the music itself and in the spaces that the music is played. There has been no previous research to determine the preference associated with both these aspects., and yet gamelan music are being played more and more in Western style concert halls and the impact of this on the subjective perception of the music is unknown. With this in mind, the objectives of the research were to determine: the preferred sound field design for Javanese gamelan performance hall, including: the preferred listening level, the preferred Initial Time Delay Gap, the preferred Subsequent Reverberation Time, and the preferred Interaural Crosscorrelation (lACC); and the preferred configurations of surface diffusion over the frequency range of interest for the Javanese gamelan music concert hall. Computer modelling and simulation method using ODEON and subjective preference testing using the output of the modelling will be used to obtain the end result.