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<blockquote data-quote="Snoopy87" data-source="post: 1209494" data-attributes="member: 128461"><p>The reason is really simple: There are millions ways of upmixing a 2.0 signal to 5.1 signal. The simpliest one would be to copy the front signal to the rear speakers. That's what my AVR also supports, but that sounds not good, it's just the same signal from all speakers. Yamaha, Denon, Onkyo, etc. have decades of knowledge. Those DSP programs are able to investigate the stereo signal. Finding voices which will be send to the center speaker. Locating musical instruments which will be then placed at the correct position in your room, etc. Hope you understand what I mean. Upmixing != Upmixing. So a good AVR is able to create a 5.1 sound from a 2.0 source which sounds exactly if the source have been recorded in 5.1 ;-) I can't belive that a few open source developers included such high quality audio upmixing without studying audio many years, writing thousands of algorithms, etc. in LAV Filter, BASS, MPAR, etc. Never! This is too complex and if it would be possible no one would ever need a AVR from Yamaha, Denon, etc. anymore <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin&nbsp; &nbsp; :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>

[QUOTE="Snoopy87, post: 1209494, member: 128461"] The reason is really simple: There are millions ways of upmixing a 2.0 signal to 5.1 signal. The simpliest one would be to copy the front signal to the rear speakers. That's what my AVR also supports, but that sounds not good, it's just the same signal from all speakers. Yamaha, Denon, Onkyo, etc. have decades of knowledge. Those DSP programs are able to investigate the stereo signal. Finding voices which will be send to the center speaker. Locating musical instruments which will be then placed at the correct position in your room, etc. Hope you understand what I mean. Upmixing != Upmixing. So a good AVR is able to create a 5.1 sound from a 2.0 source which sounds exactly if the source have been recorded in 5.1 ;-) I can't belive that a few open source developers included such high quality audio upmixing without studying audio many years, writing thousands of algorithms, etc. in LAV Filter, BASS, MPAR, etc. Never! This is too complex and if it would be possible no one would ever need a AVR from Yamaha, Denon, etc. anymore :D [/QUOTE]

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