Need help to determine proper angle to place speaker

matt3D

New member
Joined
Oct 29, 2008
Messages
2
Hi, I am trying to figure out what angle to set my speakers to for Dolby Atmos. I have two speakers side by side that are facing the ceiling. The sound they produce travels upwards, reflects off the ceiling and then back to the listener to create a more immersive experience. Normally, if the ceiling was parallel to the ground I could figure out what angle to place the speaker using simple trig identities and formulas but what is confusing me is that my ceiling is pitched at an angle and that is throwing me off. The last time I took a geometry course was around 12 years ago so I'm a little rusty. I attached a picture to show the setup. So far I have determined the height of the walls, the distance between the speakers and the listener. What height the speakers are at, and what height I would like the reflected sound waves to hit the listener, and the angle of the ceiling.
I used tan^-1(x)=9'2"/12' to find the angle x= 18.86 degrees for the ceiling angle. I am looking to determine what the angle should be with the ?. I think I will need a system of equations to set this problem up. Can anyone give me any hints or point me in the right direction? Thanks and happy holidays.
-Matthew
 

Attachments

  • angle_of_speaker_help.jpg
    angle_of_speaker_help.jpg
    111.8 KB · Views: 1
The way to aim something in order to reflect to a given target is to reflect the target and aim at the image.

That is, find where the person's image would be if the ceiling were a mirror (by drawing a line perpendicular to the ceiling), and then just find the straight-line direction to the image:
FMH109451.jpg
Is this enough to get you started? It sounds like you have no trouble with the trig. (But I can't vouch for the acoustics; there may be other issues to consider besides direct reflection.)
 
Top