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The ovbious things to check have been completely ignored. Check you tonearm calibration, check your headshell calibrations (if used), check your stylus isn't worn out, clean your records with cleaning fluid, and make sure your "USB phono adapter" isn't just a cheap RCA to USB interface (as Bustin4Justin suggested, you might not have a RIAA preamp curve which is needed to reproduce vinyl's balance of frequency).
Then after all that, if they still sound shit then buy some less worn out vinyl.
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