I've seen many of guys use their Smaart rigs. I keep seeing the same 3-4 ways they put their reference mics.
1. On a stand pointed towards the PA.
2. On a super tall stand with the boom extended all the way out. Pointed towards the Pa
3. Pointed down towards the floor.
4. On a straight stand full extended, with the mic pointed straight up.
So the question is which is right, which is wrong, is one better than the other?
As usual-it depends.
When you say "pointed at the floor"-are you talking about a PZM mode (with the mic next to the floor) or on a stand pointed at the floor.
If the later-that is NOT a good way.
When doing the PZM, it depends on how high you are trying to measure. For very high, it should be pointed straight down-with about a business card space between it and the floor.
When on a stand-if you are trying to measure up high (above 10K or so), then you MUST point the mic towards the speaker.
Even the best omni mics will become a little directional that high up.
You should generally get the mic as far away from any boundary as possible-BUT still be representative of a listening position. Sometimes that means placing it in a different place than where you actually want the response to be-in order for the mic to be away from boundaries.