For those with QUESTIONS about ATMOS Height Speaker Locations, I think that the fol. Diagrams from my son-in-law's brand new ONKYO TX-NR565 [DD7.1 or ATMOS 5.1.2] are VERY Instructive for a "Typical" AVR [and are much easier to understand than most other Manuals I've seen]. I have also included link to ALL ONKYO Manuals in case you want to investigate other AVR's:
[All Onkyo Manuals]
There are THREE different ATMOS 7.1.2 Speaker Configurations
[Height Speakers-A, -B and -C]...each with MULTIPLE Speaker Layout Designation choices in the Speaker Setup Menu.....so clearly the AVR must be TOLD what sort of SPEAKER GEOMETRY [i.e. Speaker-to-Speaker Angular Separation, etc] is used so that it can calculate the correct Amplitude, Phase and Delay when outputting signals to the array of Speakers. CALIBRATION of Speaker Delays, Amplitude and Phase vs Frequency is an important part of the Automatic Equalization Process.
The first (Height Type A) is for Speakers located in either L/R FRONT HEIGHT or L/R REAR HEIGHT Locations. Note that in the second (Height Type B), the user can locate Ceiling Speakers [aka "Top"] at either FRONT, OVERHEAD or REAR L/R Locations, designated by appropriate AVR Menu Entry. And the third (Height Type C) is for Klipsch Style Speakers [L/R Front Height OR L/R Rear Height...but NOT BOTH] that are ANGLED to REFLECT Height Sounds off the the Ceiling, where the UP Angle SHOULD
be ADJUSTABLE so that the Ceiling Reflection Spot would be about 1/2-way between Height Speaker and MLP)....[although I suppose you'll get SOME sort of degraded Height Effect if it was FIXED to fire directly UPWARDS]. [FYI: I was also disappointed to see that it does NOT support a FRONT-CENTER HEIGHT plus REAR-CENTER HEIGHT configuration.]
All of these Height Configurations are LIMITED to providing Height Information for the FRONT, REAR or OVERHEAD (Ceiling Top) L/R Locations. An UPGRADE to a 5.4.1 or 7.4.1 AVR with 9 or 11 Amp Channels + SW Outputs would be needed to support BOTH L/R Front and L/R Rear Height Channels. FYI: Here are example Manuals for Onkyo 9-channel (TX-RZ920) and 11-Channel (PR
Earlier, I discussed importance of TRYING to Ensure that ALL Speakers use the same Mid-Range/Tweeter Part Numbers to ensure that they faithfully MATCH Amplitude, Envelope Delay and Phase Response, esp. across the difficult Speaker Crossover Regions:
Some people talk about TIMBER MATCHED Speakers....but unless they are using SAME Part Numbers, I doubt that they are truly MATCHED....esp.when located so that MLP is at a Horizontal and/or Vertical ANGLE to the Speaker, where the Energy Response Patterns rarely MATCH unless using SAME Part Number components. You are, of course, free to use whatever Speakers you have gathered together over time....just don't expect as accurate Imaging and Even Motion Reproduction as is possible with a Truly Matched ATMOS System.
ALTERNATIVE ATMOS 7.1.2 SPEAKER LOCATIONS:
ON EACH DIAGRAM, BOTTOM LEFT HAS A LIST OF ALTERNATIVE MENU CHOICES: