Aiming klipsch speakers straight down for Atmos?

[yepimonfire]

I currently have my top middle speakers aimed at the center seat in my room, however, I also have couches along the side walls where the majority of people sit. All speakers in my setup are klipsch reference or reference premier series with 90x90 horns. Off axis measurements of the RP-150m and R-15m display an identical response from 1.5khz to 14khz +-90° off axis along the x axis, and a flat response +90° along the z axis. I believe the horn fails to maintain pattern control past 14khz and begins beaming like a regular tweeter. along the z axis, destructive interference from the woofer causes a mid range suckout starting at the xover point (1.8khz) below the woofer, but it remains flat above.

The R-14m and RB-10 speakers have an xover point of 2.25khz, displaying an identical response from 2khz-14khz, +-60° along the x axis, and +90° along the z axis for the RB-10, and +-90° along the x axis, and +90° along the z axis. While there is no beaming from the 4" driver at 2khz, and 1.5khz for the 5.25" driver in the larger bookshelves, the level of the tweeter above the xover points in both speakers is down 6dB compared to the woofer at 90° off axis.

With this information in mind, I have two questions.

Would it be a better idea to use the larger bookshelves with the lower xover point for the more consistent pattern control down to 1.8khz? Secondly, assuming the speaker is oriented in such a way that the point below the woofer where the null exists is outside of any seating areas, would the 90° dispersion provide consistent coverage to all seats better if pointed straight down vs aimed at the mlp?

I will post some diagrams shortly.

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[yepimonfire]

The angle at the mlp of the atmos speakers is exactly 55° to the front and 50° to the left and right. What I would likely do is aim the woofer towards the side walls to completely avoid the nulls. No seats in the room would be outside of the RB-10s 60x90 pattern, the MLP would be at 50° from the top of the tweeter (where a 90 degree pattern exists) and the farther seats on the side couches would be 20 and 45 degrees from the left and right of the tweeters.

The way that it's oriented now with the speaker aimed at the MLP places the side couch in the null under the woofer. All seats receiver even coverage from every speaker in the bed channels (minus the horizontally oriented mtm center, which will soon be replaced), so that isn't an issue.

 

[William Lemmerhirt]

Who cares. Being on the side walls they won't get much of the front or rear soundstage either. Why bother with overhead placement for the side couches? I'd focus on the MLP. Guests will get what they get. There's no way anyone sitting on either side couch will get the same envelopment as the LP.