Rules - that's listening position. Peak capture might register 100dB, unless I'm driving hard to cause distress on purpose.
My listening is almost entirely for data-gathering. My chair is on wheels and my spl meter is velcroed to my thigh. 2' square carpet tiles tell me where I am and where the speakers are. Listening distance is generally 10' to 12' out (10' was design distance.) I find more value in terms of speaker distances from walls, rather than between them. Thiel polar pattern is optimized away from boundaries, and many problems result from early reflections. In a 15' wide space, I would rather have 6' between speakers with 4.5' to side walls, than to have 8' between and only 3.5 aside.
My listening is almost entirely for data-gathering. My chair is on wheels and my spl meter is velcroed to my thigh. 2' square carpet tiles tell me where I am and where the speakers are. Listening distance is generally 10' to 12' out (10' was design distance.) I find more value in terms of speaker distances from walls, rather than between them. Thiel polar pattern is optimized away from boundaries, and many problems result from early reflections. In a 15' wide space, I would rather have 6' between speakers with 4.5' to side walls, than to have 8' between and only 3.5 aside.