Originally Posted by tngiloy
I couldn't locate the posts where Bob explains the mic positioning, but this is the procedure I use following Bob's advice and the instructions in the Anthem manuals, and a few years worth of experience using ARC.
The mic stand that Anthem provides with ARC makes it difficult to put the mic in an optimal position when doing sweeps, especially if your normal seating position is in a reclinig chair/sofa.
First, at Bob's suggestion, I bought a 'boom' extension for my mic stand. It cost $12 at a local music store (the kind that sells guitars, drums, etc.) and attaches onto the Anthem ARC mic stand. This has allowed me to get much more accurate positioning. The 'boom' is not absolutly required to get good mic positioning, but it sure makes life alot easier. Try it! You'll like it!
With the boom-mic ready,I first put my seats in the reclinig position (the position the seat will be in when in use), then place the mic stand in front or behind of the #1 position. The position of the stand doesn't matter. The position of the mic does!The #1 position should be centered over the main listening position.
If there is only one person in the audience, place the mic over that seat. If there are two, put the mic between the two seats. If there are multiple rows of seats in a theater, place the mic in the center of the average audience that you would have in attendace.The mic should be at ear level when seated.The mic needs to be pointing straight up towards the ceiling.The mic needs to be at least 1' in front of any surface (chair/wall).
For the #2 position move the mic 18''- 24''to one side of position #1. For position #3 move the mic 18''- 24'' to the other side of position #1.
For a single rows of seats the mic positions would look something like:
For a theater with multiple rows it would look something like this:
If you you use a different speaker configuration or a different #1 seating position for movies and music, then you should consider doing separate movie and music ARC readings.
Hope this helps.
I have also followed these guidelines when I had a D2 and now that I have a D2v. But now, after a few years, I have these new questions about the procedures.
First a description of my setting:
I have a rectangular room L.8m X W.5m
I have 2 sofas. The closest to the screen, a smaller one (S.1) is at floor level. A larger one (S.2) is right behind the small one on a second level about 30cm higher.
I usually ran ARC twice. Once for Movies using a 7.1 system, and then for Music using on a 2.0 system.
So my measurements looked as follows
That way I always got around 3.9 of Gain for Movies and 0.7 for Music.
So I usually raised the Music Gain to 3, overriding ARC.
Now, I noticed lately in an earlier post that I could run ARC once, selecting the Music mode as "Same as Movie", and only after deselect all the unneeded speakers in the Music mode to make it a 2.0 profile.
If I do that, which positioning should I chose?
I suppose, logically, the wider one, the Movie positioning.
But then what about Gain?
What about the focus on the main #1 position?
What do you think?