LFE on downmix... +10 db boost?

Hi all,

Just a question about the “include LFE in downmix” option, which I appreciate having on OSMC as it is not readily available on other player platforms.

My question: is it safe to assume that the LFE is NOT boosted by 10 db before being included in the downmix? My understanding is that it is convention for LFE channels to be mixed at -10db, and that a processor normally boosts +10 db to compensate.