it would make sense to do that in the mastering and i will look up the ‘Constrain Delay Compensation’ either way. I have never tried to actually “Mastering” since i usually just mix it down to an mp3 so i can take a listen on the car stereo to hear what it really sounds like. I am just using a set of krk5’s for monitors and they don’t really give me what its actually going to sound like.