Broadband is of limited usefulness if you are really concerned about transparency.
iZotope's RX Denoise allows tailoring of the Curve, after a noise sample has been learned,
and use of the Curve, with the Threshold and Reduction controls, can optimize results, but
even after hours of experimentation, you may find little overall improvement.
And people wonder why this work is so labor intensive!
I have always found parametric EQ to be a very powerful tool in noise removal work
(I still use iZotope's Ozone 5), since some forms of noise cannot be well attenauted
without a parametric filter.
Date: Sat, 23 Jun 2018 09:21:42 -0400
From: Dan Gediman <[log in to unmask]>
Subject: Re: Processing micro cassette audio using iZotope RX5
I really appreciate all the insightful suggestions made recently. I will definitely lower the playback volume on the machine to avoid clipping. I am going to try Tim’s various suggestions and am in agreement that noise reduction software, when overused, can have dreadful results. However, it sure saved our butts removing scratches and surface noise from scores of This I Believe records for the This I Believe series I produced awhile back. But for broadband noise from poorly recorded interviews it seems to produce limited results.
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Douglas Pomeroy [log in to unmask]