How do I remove the "empty hall" sound of a voice recording?

I have a recording of an interview done in a guys 10x10 "empty" office. It sounded like he's recording in his bathroom. Does anyone know how to clean up this audio so it sounds a little more like it was done in a sound booth?
What I have is a mixed version that has a little music under his voice. He mixed it over his voice trying to hide the "I recorded my webcast from my bathroom" sound...
I'm not sure how to post it here, but I could email anyone some of the audio if you'd like to play with it.
Thanks for your help!

> So reducing any resonant frequency will have to alter the sound of the original stimulus - it's completely unavoidable.
Correct. EQ will affect whatever is in the recording. That means it affects the original stimulus plus resonant effects of the room. The fact that EQ affects the original stimulus in the recording is a drawback; but it does not mean the technique never will work.
> And by and large it has been found that altering the EQ like this makes things worse, not better.
This depends on the recording: the nature of the resonance, the decay time, etc. If resonance in the recording described in message #1 is the most distracting problem, then reducing resonance through EQ may yield an improvement.
You repeatedly emphasize that EQ will affect the original stimulus. Clearly you are very focused on this aspect of using EQ. Yes. It will affect the original stimulus. We already comprehend this. No one suggested otherwise. Got it. Agreed. :).
Moving on: the fact that EQ affects the original stimulus in the recording is a drawback to using EQ. Yet that may still be preferable to leaving the resonance in the recording. As you state, EQ will alter the desired sound (original speaker's voice) along with the sound one attempts to attenuate. So it is safe to conclude that the outcome will not be perfect.
Nevertheless, given an imperfect world in which a recording that was made has the unfortunate quality of sounding like it was made in a bathroom (as the original poster described it), using EQ to reduce resonant frequencies may indeed yield an improvement.
> you clearly haven't the faintest idea of what you are talking about, and obviously haven't tried this.
More overstatements. I suggest a modicum of nuance.
Back to the FAQ you cited: it does contain a reasonable suggestion regarding EQ. ozpeter recommended trying a parametric EQ. This is a reasonable thing to try because it may yield an improvement. Mind you, not a guaranteed improvement, but nevertheless it is worth a try.

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How do I remove the "empty hall" sound of a voice recording?

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