The OP is not speaking of RIAA equalisation. Yes that is vital to restore (very close to) equal volume at all frequencies from what is a very unequal cutting process.
The producer had a very big equaliser panel in front of him when the recording was made. He was probably a fiddler, anxious to be seen to earn his fee, so likely he moved some frequencies away from flat.
That was his decision and he felt his work improved the sound of the recording.
If you buy an equaliser and fiddle about with the producer's frequency balance, all you are doing is saying you don't agree with the producer's decisions and want to change them.
Oh, and also introducing loads of noise and distortion from the equaliser instead of using straight wire whenever possible.
Don't.
The producer had a very big equaliser panel in front of him when the recording was made. He was probably a fiddler, anxious to be seen to earn his fee, so likely he moved some frequencies away from flat.
That was his decision and he felt his work improved the sound of the recording.
If you buy an equaliser and fiddle about with the producer's frequency balance, all you are doing is saying you don't agree with the producer's decisions and want to change them.
Oh, and also introducing loads of noise and distortion from the equaliser instead of using straight wire whenever possible.
Don't.