[SurroundSound] QUAD-FLACs are not in 4.0 but in 5.1

Hi friends, since I´m a pensionare I have a bit more time to arrange my music-library. By this I noticed, that a lot of my multichannel-quad-files are not in 4.0 as aspected but mostly in 5.1.
Does anybody have an idea, what was the reason for that in former time? Imade, as an example, with ffmepg a channel-rearrangment in this way:

ffmpeg.exe -i "E:\DATEN\Downloads\Vom HUB\_SHARE\+++ Multi-Ch +++\VA - Surround Master [FLAC 5.1 24-96]\101 Strings - Bacharach Webb.flac" -filter_complex "channelmap=map=FL-FR|FR-FL|SL-SL|SR-SR:channel_layout=quad(side)" new.flac

 -or-

ffmpeg.exe -i "E:\DATEN\Downloads\Vom HUB\_SHARE\+++ Multi-Ch +++\VA - Surround Master [FLAC 5.1 24-96]\101 Strings - Bacharach Webb.flac" -filter_complex "channelmap=map=FL-FR|FR-FL|SL-BL|SR-BR:channel_layout=quad" new.flac

I think, it depends on your speaker configuration, what kind of mapping you will use. I tried both and doesn´t hear differences.

A reason could be, that my AV-receiver switched the BACK-channels to the SIDE-channels. My speaker configuration is as follows: 5.1.4

A further positive result is, the the space you need will reduce: 1.633.762.617 Bytes --> 1.175.328.464 Bytes in my example.

The topic above is about PCM (mostly FLAC), but it seems, the are similar files in DTS, but there would it be a bit more difficlut ...

Who has more background knowledge in this field?

Razi

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