A method of adjusting signals in an automobile audio system having at least two near-field speakers located close to an intended position of a listener's head; the method comprising: for each of a set of designated positions other than the actual locations of the near-field speakers, determining a binaural filter that causes sound produced by each of the near-field speakers to have characteristics at the intended position of the listener's head of sound produced by a sound source located at the respective designated position, determining an up-mixing rule to generate at least three component channel signals from an input audio signal having at least two channels; determining a first set of weights for applying to the component channel signals at each of the designated positions to define a first sound stage; determining a second set of weights for applying to the component channel signals at each of the designated positions to define a second sound stage; and configuring the audio system to: combine the first set of weights and the second set of weights to determine a combined set of weights, the relative contribution of the first set of weights and the second set of weights in the combined set of weights being determined by a variable user-input value, determine a mixed signal corresponding to a combination of the component channel signals according to the combined set of weights for each of the designated positions, filter each mixed signal using the corresponding binaural filter to generate a set of binaural output signals, sum the filtered binaural signals, and output the summed binaural signals using the near-field speakers. for each of a set of designated positions other than the actual locations of the near-field speakers, determining a binaural filter that causes sound produced by each of the near-field speakers to have characteristics at the intended position of the listener's head of sound produced by a sound source located at the respective designated position, determining an up-mixing rule to generate at least three component channel signals from an input audio signal having at least two channels; determining a first set of weights for applying to the component channel signals at each of the designated positions to define a first sound stage; determining a second set of weights for applying to the component channel signals at each of the designated positions to define a second sound stage; and configuring the audio system to: combine the first set of weights and the second set of weights to determine a combined set of weights, the relative contribution of the first set of weights and the second set of weights in the combined set of weights being determined by a variable user-input value, determine a mixed signal corresponding to a combination of the component channel signals according to the combined set of weights for each of the designated positions, filter each mixed signal using the corresponding binaural filter to generate a set of binaural output signals, sum the filtered binaural signals, and output the summed binaural signals using the near-field speakers. combine the first set of weights and the second set of weights to determine a combined set of weights, the relative contribution of the first set of weights and the second set of weights in the combined set of weights being determined by a variable user-input value, determine a mixed signal corresponding to a combination of the component channel signals according to the combined set of weights for each of the designated positions, filter each mixed signal using the corresponding binaural filter to generate a set of binaural output signals, sum the filtered binaural signals, and output the summed binaural signals using the near-field speakers.