Sound quality has so many nuances. The variables which can change perceived sound quality are: relative loudness, frequency balance, spacial imaging, relative distortion, speaker quality, quality of the electronics and how well the system was tuned to name a few. So, the sound quality issues you cite may not be entirely due to the speakers. If you try to mate new, higher quality speakers to a cheap head end or amplifier you might still be unhappy. Best to purchase a higher quality system at the beginning.
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