I might also suggest that all of you involved in this discussion need to read up on some basic electronics and physics before you comment. The above topic is one of the most commonly misunderstood topics in all of audio. The difference between phase(timing) and polarity (positive vs. negative charge values). Phase does have a very noticeable effect on sound, polarity not so much(as long as it matches). However when designing electrical circuits, circuits based on negative charges are quieter then positive because the noise in the natural world tends to be positive,i.e. static electricity,lighting, are positive. This would be a reason for inverting the polarity of a system,i.e. an amplifier.
Sound differences could be due to some unknown sensitivity in hearing and/or more likely the physical path the circuit takes,i.e. chassis ground connections( shared connections introducing noise) vs. physically isolated in and out connections. This being compounded further by mixing and matching components of different design's.
Sound differences could be due to some unknown sensitivity in hearing and/or more likely the physical path the circuit takes,i.e. chassis ground connections( shared connections introducing noise) vs. physically isolated in and out connections. This being compounded further by mixing and matching components of different design's.