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...not the great detail like have been use to... But the sound isn't as bright as I would like it...
How old are your records? Most older records sound "dull" compared to CDs. A cheap phono cartridge could also have a weak high-end.
I'd say by the late 70's and 1980s (about the end of the vinyl era) records were getting pretty good. Some older records had good sound. But the older the record, the more likely you are to have poor quality.
And, it's analog! There's a good reason why the world "went digital!"
I frequently boost the high end with vinyl transfers. What software are you using for recording? If you are using an audio editor, it should have an equalizer.
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I do have new speakers which I am not crazy about. Should I use my good quality headphones for monitoring instead.
If your headphones sound better than your speakers, use the headphones.
Then choose a good-sounding CD as a reference. (Don't choose the "brightest" CD you have.)
Listen to your reference CD to "calibrate your ears". Then adjust the EQ on your vinyl transfer for a similar-sounding frequency balance. Don't expect a perfect match, and try not to over-do it. It's generally best to use slightly less EQ than you think you need, rather than slightly more.