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In Reply to: RE: Low level listening with big Magnepans posted by Kirk57 on November 05, 2009 at 14:23:20
"I'm wondering if Magnepan has changed the magnet structure/strength over the years. I *think* the mylar and wires are pretty much the same."
I don't know anything specific about Magnepan's decision but it is certainly true that neodymium permanent magnets have become standard industrial products during that time. These have substantially higher field strength than previous magnets, and therefore with the same amount of current, you get a larger mechanical force.
I now have MG1.6's and compared to my old MGIIb's, they are substantially more efficient, and have clearly more high-frequency extension. Maybe that makes them sound 'clearer' at lower SPL's?
But also remember the classic Fletcher-Munson curves: humans have varying sensitivity to sounds vs frequency depending on the SPL. This is the origin of the loudness "button", which really should be a knob, and should be calibrated to overall system sensitivity.
So it is natural that the tonal balance changes with varying volume. It's possible that a fully linear and flat responding speaker at higher volumes will sound not as nice at lower volumes simply because it reproduces exactly the same thing, but humans don't hear that way.
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