It's always possible that a driver is failing (this happened to me with a pair of Grados once, in fact, so nobody is free from the problem), but it's best to run a bunch of tests first.
foobar2000 is well equipped for dealing with this problem. Try (on the DSP page) "downmix channels to mono" and flipping the earphones around. Try "reverse stereo channels" and chance them back and forth. Determine if it's a real problem rather than a perceived problem first, then try changing the filters.
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Team GRADO
Team College-Fi ( Virginia Tech)
GARFIELD, as seen in my avatar
EMU 0404 USB --> Head-Direct EF1 --> HF-1 #354 or HF-2 #337
iAudio X5L --> (ktpg custom portable) --> Head-Direct RE0
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