I am certainly not knowledgeable about audio things, but I believe I have heard that there is a difference in the range or frequency, etc. our ears hear. Therefore, music is recorded to take that into account and why it is important for the best quality to have the right speaker positioned to the right ear, etc. I am not sure about this, but from memory it seems to me you will generally hear the lower sounds in the left channel. Just my two cents worth, and I am probably owed change... Eric SS