Actually gdhal....
"The scenario you describe might apply to completely different speakers. Two of the same speaker (brand/model) would also have differing efficiencies, but that should be extremely little, like less than one half of one db."
.....when you place one speaker on the left and one on the right there is a huge balancing difference. For those who have expansive soundstages the balancing act is crucial. Here's how big of a difference it is. Take a Martin D-28 and tune it up on the left side (where you would place your left speaker). Now take that Guitar to where you would have your right speaker. Do it with exacting measurements to how you have your speakers setup. Listen to how different the same guitar sounds in both left and right positions, it will amaze you.
I have a major problem with systems that do not have balance controls. Makes no sense to have every recording different and a system that is not able to play it correctly. I know High End Audio sold you a bill of goods saying no balance and no equalizing, but they were dead wrong and are paying the price for it.
Michael Green
www.michaelgreenaudio.net