I will update this post/thread eventually, especially since this post is from May 2017 and a lot has changed over time. But please consider reading the paragraphs on "EXAMPLE 2 - "The Glue Effect"
Mix Challenge - Addendum: Summing Bus Treatment
And to close this one out, before this turns into a way too big off topic discussion:
Despite what others might say (most notably, Youtube "tutorials", or those stating "you're doing LUFS wrong" -- basically those that still cling to the days of the Loudness War).
The
maximum allowed loudness for the Mix(ing) Challenge is still
-16,0 LUFS ILk (Integrated, k-weighted), with a maximum signal strength of -1,00 dBTP (which at this rate, only happens if your peaks go "rogue"). Outstanding mixes can be achieved at that program stream loudness, EDM mixes can still have a healthy movement in the Short Term Loudness Range. Summing bus compression, as mentioned in the post above, is then used as an artistic tool.
If in doubt, maybe indeed try as mentioned above as experiment for a comparison/listening test... create a Clipper > Limiter array for testing purposes (e.g. VladG/TDL Limiter No6), check at -16,0 LUFS ILk max and -11 LUFS ILk max... Maybe even render both, loudness normalize, then A/B. Also download a demo of Audified MixChecker Pro or a demo of AudioThing Speakers, compare to other listening environments (plenty of them in both tools). It if sounds great everywhere, no matter if at the game's allowed maximum LUFS (-16,0 LUFS ILk max) or -11 LUFS ILk (what "Spotify Loud" uses), then it translates well to everywhere.
Still -- the rules of the game clearly state:
Try to create a mix in your own style that complements this production and can stand on it's own, no matter the playback medium. Edit/Mix in such a way, that barely any after-touches other than proper fade in/out and finalizing for distribution (incl. loudness adjustments e.g. for release on Streaming, Vinyl, Tape, CD) is needed for a possible follow-up mastering step.
Maximum allowed loudness: -16,0 ILk (Integrated)
See
post #003, the TL;DR Rules.txt and the
official rule book.
The timer is still running, 7 days left.
Have fun, and good luck.