Systems for 3D sound reproduction are often implemented with binaural technology where signals are played back over loudspeakers. This paper reports preliminary results from an investigation on how reflected sound in the listening room influences horisontal localisation in such systems. An experiment, consisting of listening tests, was done. Results from the experiment showed that reflections as late as 5ms and 10ms did influence localisation in such systems. The probability for reversals between front and back localisation increased, and the ability to localise to the back was degraded. Localisation was clustered towards the direction of the reflections.

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