| If it works for you and gets the check paid, then you're welcome to continue doing it.
I would rather mix to monitors that tell me everything and then check on a low-quality system for reference afterward. Your experience double-checking will inform you enough about how the mix is going to translate even wen you are working on your reference monitors.
But your reference monitors are going to tell you so much more about your sound than a low-quality system. If HD video is going to be played mostly on SD systems, do you presume that the shooting, editing, color correction, etc are going to be done in Standard Def to make sure that it is done right for the majority of viewers? Not knowing much about that process, I am assuming that quality is maintained throughout the pipeline and the end product is checked at a low resolution as needed for reference.
Losing out on one thing in order to check for another is not a good way to listen to your entire mix, IMO. |