Originally Posted by Shrike645
I believe ARC uses the first mic position for the speaker volume level trims so yes it is important.
I don't think being in the room while measurements happen is a problem. After all you are in the room when you are listening so if your presence affects ARC measurement in any way then it should be there when you are listening too.
The first mic position is definitely the most important one, as that's the one used to set speaker volume trims. It should be set at the center of your primary seating, with the mic tip at seated ear height and with the mic pointed straight up.
A "boom arm" mic stand makes it easy to extend the mic over seat cushions or from behind, over a seat back to get it to your head position. You can get a complete, light weight boom arm mic stand for about $30, shipped, or just the boom arm itself to put on the top of the Anthem-supplied, straight pole stand. Simply unscrew the mic clip from the Anthem stand and screw it on to the end of the boom arm. Here's a complete stand I like:http://www.bhphotovideo.com/c/produc...Mic_Stand.html
Keep the mic tip away from reflective or blocking surfaces. E.g., if you have high seat backs raise the mic tip a few inches to clear the seat back or move the mic about a foot closer to the screen to get it away from the seat back. Try to keep the mic tip a good foot or more away from walls. 18 inches is better. This can be a bit tough if your seating is flush to a back wall.
Subsequent mic positions have the mic set the same way for height and pointing. They must alternate either side of #1 and no two mic positions (whether or not sequential) should be closer than 24 inches apart -- I like to use 30 inches.
It is a good idea to have some forward/backward shift in the positions as well as side to side. So if you were measuring for typical sofa seating, rather than run 5 positions all along the seat back of the sofa, swing the outer two positions in closer to the screen by about the width of the sofa cushion. Typically that will put the outer two positions outside the sofa arms and roughly aligned with the front of the sofa cushion.
Note that you are NOT trying to get a mic position at each sitter's head position The idea is to sample the range of the listening area, but within the rules above.
Choose your mic positions with the aid of a steel tape measure. It helps to mark each position with a piece of painter's masking tape (the type that leaves no residue behind) placed on the furniture below where you want the mic to be. That makes it easier to repeat the positions. Jot down some notes about HOW you arranged the mic positions so that it is easy to do it again the next time you try -- which makes it easier to compare results.