FWIW - an commodity addressing this discussion:
https://world wide web.justmastering.com/article-mixingformp3.php
And here'south what Izotope has to say well-nigh it:
Mastering for SoundCloud
SoundCloud transcodes uploaded sound to 128 kbps MP3 to ready the audio to stream from the site. If an audio file on SoundCloud is fabricated available for download, the downloaded version volition be in the original format.
Uploading an MP3 is redundant since SoundCloud volition transcode information technology anyway, which could in turn introduce more artifacts to audio that's already compressed. Therefore, the best practice is to upload an uncompressed, 24-bit .WAV file and allow SoundCloud to process it.
Here are some recommended settings when mastering audio for SoundCloud:
Employ a True Height limiter, such as Ozone 6, to ensure that the margin is set to –0.3 dBFS. This is an acceptable threshold to mitigate most of the clipping that occurs during the encoding process. Even so, depending on the source material, y'all may observe a margin of –0.5, –0.seven, –1.0, or –1.v dBFS sounds better, with less distortion. In these cases, you simply have to perform trial and error, perhaps by uploading several versions and deleting all just the best sounding one.
SoundCloud does non accept a feature similar Apple tree's SoundCheck, so an audio principal destined for SoundCloud has more liberty to enhance the overall RMS level for competitive loudness. Consider this a applied and aesthetic choice. Make sure to apply volume matching, such every bit the 'automatically match effective gain' characteristic in Ozone, to evaluate loudness increases objectively.
Using a stereo imaging tool, narrow the high end between 5–20%. 128 kbps MP3 is the lowest commonly acceptable sound quality. As such, a lot of information is lost during encoding and an extremely wide mix is more susceptible to noticeable artifacts. Ironically, some pre-emptive narrowing can assist avoid perceived loss of energy and width.
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