All capacitors are audible to some extent. Power supply caps are indeed audible as they are constantly being discharged and charged as the music plays. All the energy used to play the music is stored in these caps so it is impossible that they would not affect the sound. You would notice huge differences if you were able to replace all the electrolytics with some type of film cap. Of course the problem is they would take up so much room.
Although this discussion is about caps used in a crossover it might prove useful. http://www.humblehomemadehifi.com/Cap.html
If it uses electrolytics as coupling caps I would try to replace those with film if space permits and go from there.
Although this discussion is about caps used in a crossover it might prove useful. http://www.humblehomemadehifi.com/Cap.html
If it uses electrolytics as coupling caps I would try to replace those with film if space permits and go from there.