For occasional or intermittent sound quality problems, check the source of the recording first... it could be the streaming service or just a crappy recording/mix to start with.
Brightness is more likely to come from speakers, bad room acoustics, or bad source material than from a streamer. I agree with others: try Qobuz to see if that may help. Also, tell us about the rest of your chain (especially speakers) and your room acoustics.
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