Volleyguy, I won't debate break-in phenomena at length here, but IME some rather obvious changes sometimes occur through long break-in cycles-- particularly with digital circuits and caps and cables. After further break-in the HF of Duelund 2.0 V2 wire has opened and become airier. There is always the possibility of some sort of confirmation bias taking place over time, but personally I have more faith in my ears than that.
I'm not suggesting that you can't hear a difference from L to R when using different piece parts in your L and R speakers. However it's at best a confusing test methodology that will likely miss the finer points in operation as components reach a high level of performance. My little DAC mod experiment was the best example that I could give of how such improvements are perceived by two ears in stereo.
In another context, consider that some listeners with asymmetrical hearing loss claim to experience a balanced L/R stereo image.
I'm not suggesting that you can't hear a difference from L to R when using different piece parts in your L and R speakers. However it's at best a confusing test methodology that will likely miss the finer points in operation as components reach a high level of performance. My little DAC mod experiment was the best example that I could give of how such improvements are perceived by two ears in stereo.
In another context, consider that some listeners with asymmetrical hearing loss claim to experience a balanced L/R stereo image.