Dolby 5.1.2 Speaker Placement
Up until the moment of this writing, DTS has not shared speaker layouts for its new DTS:X codec. However, it is object-based codec technology (similar to the description of Dolby Atmos), and we pointed out in our article, the name is incredibly close to “DTS Headphone:X” that is clearly based on a “classic 11.1” setup, as DTS’s own demonstrations have showed. Other projects in which DTS is involved, for example the native 3D Audio recordings with Hans Zimmer, have been done in 11.1 as well. Speaker layout: “Classic 11.2” used for Atmos Yamaha’s “Classic 11.2”, expands the basic 7.1 with clockwise (Figure 6): • Presence Left (Dolby and Audyssey call these “Front Height Left”) • Presence Right (“Front Height Right” in Dolby and Audyssey) • Rear Presence Right • Rear Presence Left • Subwoofer (Subwoofer L and Subwoofer R in the image, hence the.2) Figure 6: 'Classic 11.2'. Courtesy of Yamaha. If we want to use the “Classic 11.2” speaker layout for Atmos playback, we should mount the presence speakers at a certain height.
Dolby Atmos 5.1.2 Speaker Configurations
Speaker Placement Height
The vertical angles Dolby has specified for the in-ceiling speakers are useful for this. Only some basic mathematics is needed: the tangent of the vertical angle (like 30°, 45° or 55°) needs to be multiplied by the distance to the presence speaker on the floor plane (Figure 7): h = l*tan(θ) h = height of presence speaker l = distance to presence speaker on floor plane θ = (theta) vertical angle Figure 7: Height vs. Distance calculation. It’s important to select similar sounding speakers for ALL channels to guarantee the homogeneity of the system Sitting in a typical listening position means the average height of the listener’s ear is 3 feet (≈ 1 meter). At a distance of 9 feet, one can mount a presence speaker at a height of h = 9 * tan (30°) + 3 = 8 feet minimum to meet Dolby’s advice.
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