I received a voice recording (here is a sample from a larger file)
I don't understand what caused the issue, and I don't understand how to make it tolerable. Trying the de-reverb treatment in iZotope RX10 yielded no results. Is there a solution?
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It's peculiar - the tops of the vocal bits are chopped off in the spectrogram in very deliberate chunks. I wonder if that's a file compression thing.
But anyway, first, I'd remove the noise (learn from the biggest "silence" gap), so any subsequent processing doesn't also process the noise. I'd try to be heavy on the gating, as it seems no heavy spectral cleansing is needed (it's also different during the vocal windows, like that compression you get on phone videos is present). Although not essential, you could also attempt to smooth the sharp 16 kHz roll-off simultaneously with the harmonic synthesis slider.
Then I'd de-reverb. There should be an early reflections preset (it won't only process early reflections). Watch out for noise removal artefacts though - it just needs to be subtle. If you don't like too many settings, use the dialogue de-reverb with the light reverb attenuation preset.
Then, if it's all good, I'd start on the enhancements, like EQ, etc.
Patented n00dles Tip: When you're using the de-reverb/dialogue de-reverb, invert the amount slider to get a feel for what you're actually targetting (It's similar to using the "output noise/reverb only" switch, but different). This inversion technique is useful in a lot of trial-and-error processing situations.