Try adding this filter to your left channel, this should fix wide channel imbalance center around 4100Hz.
If you think that left channel is louder than right channel try to adjust with the balance control or move your left speaker slightly further away from your LP.
View attachment 175722
Blue=left, green=right
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Moving the speaker will effect arrival times of the two and therefore phase, he gets excellent summation throughout all freqs from a previous graph so distance should not be changed, adjusting levels is perfect
If you really want to play use some 1/3 octave banded pink noise and go through the bands, all 30 should be centred, if you find one that’s not try a q of 4.3 in that spot and either drop the side which sounds like the sound is towards
All 30 bands should be centred (well the lowest probably won’t register… but these are least important), this uses your ears and not a mic, a mic is only as good as the method used to collect its information, ears are what you hear with and don’t change (apart from getting old… woohoo!)