FWIW - an article addressing this give-and-take:
https://www.justmastering.com/article-mixingformp3.php
And hither's what Izotope has to say about it:
Mastering for SoundCloud
SoundCloud transcodes uploaded audio to 128 kbps MP3 to prepare the audio to stream from the site. If an sound file on SoundCloud is made bachelor for download, the downloaded version will be in the original format.
Uploading an MP3 is redundant since SoundCloud will transcode it anyway, which could in plough introduce more artifacts to audio that's already compressed. Therefore, the best practise is to upload an uncompressed, 24-scrap .WAV file and permit SoundCloud to process it.
Here are some recommended settings when mastering audio for SoundCloud:
Utilize a True Summit limiter, such equally Ozone vi, 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. However, depending on the source material, you may notice a margin of –0.5, –0.7, –1.0, or –1.5 dBFS sounds better, with less baloney. In these cases, you lot simply take to perform trial and error, perhaps by uploading several versions and deleting all only the best sounding ane.
SoundCloud does not have a characteristic like Apple's SoundCheck, so an audio master destined for SoundCloud has more freedom to raise the overall RMS level for competitive loudness. Consider this a practical and aesthetic pick. Make sure to use volume matching, such as the 'automatically match effective proceeds' feature 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 audio quality. As such, a lot of information is lost during encoding and an extremely wide mix is more than susceptible to noticeable artifacts. Ironically, some pre-emptive narrowing can assist avoid perceived loss of free energy and width.
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