Yes, it appears that the "brightness" is an overemphasis in the upper-midrange/lower treble roughly in the 2-6KHz area. Using the treble tone control can help on some recordings that have this characteristic, but can't do a perfect job. Some receivers that have equalizers which can be set to affect various frequencies can do a better job. In my view the better solution is to avoid such lousy recordings whenever possible.

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Enjoy the music, not the equipment.