Off the top of my head, the following mixes engage the wides pretty heavily (
@AYanguas can confirm as he also has a 9.1.4 setup):
- Van Morrison - Moondance (the lead vocals are positioned on an object panned between the front & side speakers, so some of that signal spills over to the wides on a 9.1.x setup)
- Grateful Dead - American Beauty
- Joni Mitchell - Court & Spark (rhythm guitars in "Free Man In Paris" are mostly in the wides, so the mixer had to have used objects positioned somewhere between the front & side speakers)
- Harry Styles - Harry's House (the lead vocals are 100% mixed to the wides in this one, it's an interesting effect)
- Bruce Soord - Luminescence
- The Pineapple Thief - Give It Back
- Monkey House - Remember The Audio
In the screenshot below (the song "Lie Flat" Bruce Soord's
Luminescence), you can see the wides firing on the VU display and the object locations represented visually:
View attachment 97811
Yes, there are many Atmos mixes that use objects at Front Wides location, especially since the streaming releases boom. The benefit of the Wides is dependent on the room layout and the possibilities of speaker placement, the same as the sides/rears for 5.1/7.1
The recommended location for the Wides is exactly at the middle of the azimuth angle between the fronts and the Sides Surround. Assuming the Fronts are at 30º (for the canonical stereo of the equilateral triangle with the MLP), and the Sides are at 90º-100º azimuth, the Wides are to be located at about 60º-65º azimuth. I think
@sjcorne confirmed that an object located at 65º is rendered exclusively in the Wides.
In my experience, the Wides (when used) give a more ‘wide’ nice sound stage when they are separated enough in the wide extension with respect to the Fronts. I think the ‘ideal’ placement is when all 9 floor speakers (LCR, Wides, Surrounds and Surround Backs) are located following a circle. (I managed to do it in my room pretty much).
Our reference mixer Steven Wilson is Not very prolific using the Wides. I was disappointed with the ‘In the Court of the Crimson King’ Atmos mix for not using the Wides almost at all. I always thought it might be because his mixing studio is 7.1.4, and he cannot test enough the benefit of the Wides. Anyway, more recent Steven Wilson Atmos mixes increasingly use Wides.
The benefit of the Wides is more noticeable when the mixer locates sound there that is not usual. I mean, not an extension of the Stereo, or an additional musical arrangement, but an important item like the main vocals. One relevant example, already mentioned by
@sjcorne, is ‘2022 - Harrys House’ from Harry Styles, with the main vocals just at the Wides and nothing in the Fronts.
I enclose an Excel when I was documenting the use of Wides on Atmos mixes.
I have already stopped doing it, because there are quite a few mixes that use them, and the use of Wides is no longer so exceptional.
DSU upmixer uses them (since last major upgrade) but, of course, nothing compares to a good Atmos mix creatively using Objects locations.