I assume the radio you are using has a "loud" button or some sort of boost for lower frequencys, correct?
Try and turn the loud button off and see if that fixes your problem.
All the loud button is designed to do is give you a boost in the high and low frequencys at lower volume. When the volume is raised on many of today's headunits, the boost in the lower end is cut back so as to not damage your speakers at that high volume level.
Hope that makes somewhat sense and helps ya out.
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