I don't know that the 4db and 10db make a difence. one every thing is recorded at its optimal db you go into maxing ad so on...and a good mix with a small amount of EQing and listening on many devises should reveal a good loud mix but probly with low sound and lots of dynamics... its an art to work compresion,gain, maximising, normalizing, and eq to get a good clear sound..in fact its best to hire someone and pay out the $500-$1000 to get it done. OR just make the best mix you can.. your record company will have it mastered for you..and will get it plently loud as thats part of there job until you big enough to request your owen help in the studio on there time... but most of us arn't pink floyed yet..and some of use don't want be.
Taos