How U determine first and second reflection points


Someone told me following a while ago in room teak thread, but I don't think I understand it well. Any comments?
-------------------------------------------------------------
Have someone sit in the primary listening location, take a mirror to the side walls opposite each speaker and move it until the seated person can see the speaker reflected in the mirror. These are your first reflection points. Start from there.
-------------------------------------------------------------
eandylee
so if you where to hit my instrument and stand in front of it .Lets say you line all 4 walls with humans ,line all the ceiling and floor as well.when you hit the triangle(example)no other person will hear it but you becaue you block it ..right....life is 3d friends.......
I'm not sure what you are trying to say, but if you are saying that you need all of the reflections from the walls, ceiling, and floors to get 3d effect, you are overlooking the fact that on well recorded software that information is already there. To not treat the critical reflection points will distort the original signals and you will lose the value inherrent in making recordings using minimal mic'ing with realistic spatial information. In other words, there goes your depth of field everyone seems to think is so important.
First of all to treat, means kill in hi-fi.You or we (hi-fi)claim or describe sound as a staight line.We give examples of the beam of flash light or a cue ball off of a pool table deflection.

The earth is round...sphere. when we throw a pebble in a still lake.The ripples are round.This is a 2d picture of what happens.If you can imagine 3d of this then you will get sphere.When you take a bath and fart under water the bubbles are ......spheres and smelly(bonus).When you watch under water explosions in movies example,the sound is the shape of a sphere.When the radio tower of a tv station emits a signal it is in a radius(miles traveled) sphere...

No lines....if we change the way we think and get back to what really happens instead of what we think or we read . Hi-fi would be even better than just swapping brands etc...

I want you guys to just think about this.I'm not interested in fights...cool