Originally Posted by TB0NE
I was looking on the internet but couldn't find anything....what does the Room Gain do?
Read through the second post of this thread (also in my signature below). All really good info you should know and should answer your question in more detail.
In short, Room Gain is a naturally occuring affect where a room causes the lower end frequencies to be enhanced or magnified. Most rooms naturally increase the bass a bit so if you look at a plot of your room the frequency response is not flat.
ARC attempts to maintain that natural room gain in a room so that the sound you hear is more what you would expect in that particular room... i.e. natural in that room.
You can see in your plots that the dashed "ideal" line has a slight hump in the low end, that is the room gain. If you were to set your room gain to 0 in the targets window, you would see the dashed line go straight. If you set it to say 4 (as high as ARC will ever set it) you will see the hump get higher.
A completely dead room has a room gain of 0. A room with to much room gain will sound boomy and probably a bit muddy.
Although ARC attempts to detect the normal room gain in your room, various things can throw it off, such as to much boundary gain from a speaker being to close to a wall. As such ARC allows you to tweak the room gain to your liking. It also allows you to introduce some room gain into a truely dead room so that things sound more natural.
Note, that there is no set amount of room gain that is correct for everyroom as we expect different rooms to have different amounts of room gain based on our history in such rooms. So if you tweak the room gain to be to different from the natural room gain expected in a room, people will notice it and not usually preceive it as a good thing. In the same way, we expect almost all rooms to have some
room gain, hence a room without any room gain seems really dead.
EDIT: TBONE, looking at the room gain ARC has currently applied to your room, you are at about 1.6, this is a nice but modest room gain. A lot of people like something more around 2.5-3.5, again this really depends on the room though. Going to high in a realtively dead room will sound boomy. However, as you are looking for the low end to be enhanced a bit, setting it to 3.6 may be just the key (2 more than you have now... typically we have a hard time hearing changes less than 2). I would still recommend you listen where ARC set it for a solid week, then try changing it if you are looking for more low end
. I would not go much higher than 4-4.5 however. If you do decide to change it, try 3.6 first. Again, you don't need to re-run ARC to do this... simply open your last calibration file, go to the 'Targets' window, change the room gain, hit 'OK', 'Calculate', 'Upload'.