DVD/BD Center Channel: What % of Surround Audio?

I want to build a 3.1 system for DVD and BD movie playback. My mains will resemble these 

https://josephcrowe.com/products/3d-cad-files-horn-no-1994-es450-biradial-for-jbl-2446-2-throat

And there's my three Rythmik F12 subs. 

Will play DVD and BD movies on my pc's BD drive and use JRiver player settings to downmix the Dolby Digital or DTS-MA multichannel audio to 3.1. 

My concern is that numerous center channel speaker brands say that "up to 70%" of movie audio is mixed to be reproduced by a center speaker. But if that's true then how much of what audio is typically fed to the main speakers?

And how would this change when I downmix to 3.1?

4 hours ago, nxrm said:

My concern is that numerous center channel speaker brands say that "up to 70%" of movie audio is mixed to be reproduced by a center speaker. But if that's true then how much of what audio is typically fed to the main speakers?

70% + x% = 100%

I’d say 30% but maybe I don’t understand the question. 

Says SVS:

https://www.svsound.com/blogs/svs/why-the-center-channel-is-the-most-important-home-theater-speaker

The center channel carries roughly 70 percent of the entire soundtrack, and even more in specific moments. This includes the vast majority of dialog and musical vocals.

Says Definitive Technology:

https://www.definitivetechnology.com/en-us/product/center-channel/dymension-dm10/300564.html

Hello, and thank you for your purchase and positive feedback. Yes, the center channel is often called upon up to 70% of the time during playback, making the center speaker the most important speaker in your system. Thank you for choosing us. Happy listening.

Says ELAC:

https://www.elac.com/do-you-need-a-centre-channel-speaker

The center channel speaker is arguably the most important and underrated in a home theatre surround sound system. Nearly 70% of all audio content plays through the center channel at any given moment. It also handles the majority of dialogue and vocals in music and movies. It ties all the action together across the front stage to create continuity and a sense of realism. A better question is, what are you using your audio system for? If you are using your system to watch movies as a part of a home theatre system, you will be glad you have it.

So, apparently only ~ 30% of the audio would remain for the front speakers and subs in a 3.1 system. 

I guess my question is that since you and many here have > 5.1 systems, when you play a BD movie or stream one, do you still notice that much of the audio is heard through the center speaker?

1 minute ago, nxrm said:

my question is that since you and many here have > 5.1 systems, when you play a BD movie or stream one, do you still notice that much of the audio is heard through the center speaker?

I only listen to music on my 12 channel system. This is very different from movies. Immersive audio often uses all channels quite a bit, relies more on the front left and right, and doesn’t use the center or subwoofer nearly as much as movies. 

43 minutes ago, The Computer Audiophile said:

I only listen to music on my 12 channel system. This is very different from movies. Immersive audio often uses all channels quite a bit, relies more on the front left and right, and doesn’t use the center or subwoofer nearly as much as movies. 

Got it.

In some respects, the Schiit Syn is likely to be the most flexible approach to a 3.x system. If the files you are expecting to use are well done immersive in nature, I'm sure a discrete digital system would be best, but the Syn might do a very good job on the music reproduction of most surround (5.x) with three primary speakers compared to most AVRs and open up marvelous stereo inputs for what I regard to be a better soundfield generation than that of normal stereo. I have always regarded the 'imaging' component of stereo as artificial, although I enjoy it. Visually I equate the layering effects in Viewmaster/Stereograph/Stereomaster systems to 'imaging' in stereo audio. Nothing definitive from me here, but it's an interesting subject. I've been playing with a Syn and three speakers for almost a year now.

Skip

6 hours ago, Skip Pack said:

In some respects, the Schiit Syn is likely to be the most flexible approach to a 3.x system. If the files you are expecting to use are well done immersive in nature, I'm sure a discrete digital system would be best, but the Syn might do a very good job on the music reproduction of most surround (5.x) with three primary speakers compared to most AVRs and open up marvelous stereo inputs for what I regard to be a better soundfield generation than that of normal stereo. I have always regarded the 'imaging' component of stereo as artificial, although I enjoy it. Visually I equate the layering effects in Viewmaster/Stereograph/Stereomaster systems to 'imaging' in stereo audio. Nothing definitive from me here, but it's an interesting subject. I've been playing with a Syn and three speakers for almost a year now.

 

Skip

Given that any center speaker I find will probably not resemble my mains, which resemble these

https://josephcrowe.com/products/3d-cad-files-horn-no-1994-es450-biradial-for-jbl-2446-2-throat

Thus, I can't imagine see mono and stereo music recordings would sound so great on such a 3.x channel system. OTOH, I hoping that at least if the center is nearly as efficient as the mains that they will serve well enough as a 3.x system for DVD & BD movie playback, given that nearly all of the dialogue is intended for the center, and the Fx shared with the subs.