There are no hard and fast rules. Generally speaking it is beneficial to get the HF horn up to just above the head level of the audience. This helps ensure that the high frequencies penetrate the listen space without being blocked by the audience.
But this is Not the answer i Need.
Does it make a difference if there is a Pole inside or Not?
What is the difference? Can you hear it?
We are Talking about using it in a practice room.