Cleaning up batch audio files

Hi, new on this forum here. Any help would be appreciated.
I have over 1000 audio files in mp3 format at 96 bit. The audio files are normalized at 95.7. These files are preaching sermons at about 2 hours in length a piece (by the same person). They were recorded through the 1950s to the 1960s. The earlier ones were poor in quality while the later ones became pretty good. I would like to set the bass and treble equalization on all of the files to a decent level, and then take out some of the background noise in the earlier ones.
How would I go about doing this? Is it even possible?
Thanks,
Andrew Carter

As a listener, I wouldn't expect a sermon recorded almost 60 years ago to have pristine audio characteristics. With that, like a jazz song from the 20s or 30s, I'd be more concerned with content and would ignore hums and clicks.
Since they are going to be poor audio quality anyway, you aren't going to lose much if you open them, process, and resave as an MP3. Yes you will lose quality, but since they're compromised already, how much worse are you going to make it? What you can't do - in my opinion - is process them with a batch file. What you are trying to do is far to program content (ie sound quality) dependant.
What I would do is open the files one by one. Apply Noise Reduction after capturing the appropriate noise floor. Parametric EQ, mostly the hi and lo shelf for a little brightening, then Dynamics Processing to compress the dyamic range a bit to let it be more audible on the soft passages. Save the files as mono MP3's to save space and stream easier. The sermons from my church recordings are 44.1/48kbs mono MP3 files and they sound OK for what they are ... they serve the purpose they were intended for.
The EQ and possibly the dyanamics could be done via script (dyanmics only as the source files have already been normalized). Noise reduction should not be done by script, as I think it works best by capturing individual noise floors per file.

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