Hi all,A while ago I bought a cheap 5.1 surround set (Logitech Z906), mostly to check how much added value multichannel audio has. This I wanted to know, because I'm planning to spend a lot of money buying a nice set of speakers, so I wanted to know whether I should buy two or five speakers However, I've ran into problems. I was trying to 'AB' multichannel audio to stereo audio by just looking whether I could correctly guess which was A and which was B, so omitting the X part of the test, because I haven't installed any special ABX tools. For testing this, I took the multichannel and stereo mixes of the audio-DVD of The Lord of the Rings: The Return of the King (Complete Recordings), because it was the only multichannel source I had. I correctly identified 8/8 of some tracks and couldn't on some others, but I wasn't sure whether this has been because of the multichannel vs stereo part or because of level matching.So my questions to you:1) Is there an ABX tool with which I can do this (so it has to be compatible with multichannel audio) and which runs on Linux or Wine2) How should I level match the stereo with the multichannel? I ask this because there are a few buttons on the remote of the surround set to modify the volume of the rear- and center channels, I suspect setting them to the default setting might not be neutral. Any thoughts?3) Are there other tools that enable me to assess the added value without adding expectation bias?
ABX-ing stereo to 5.1 is pointless because it's a drastic change than anyone can hear. It's absolutely and always detectable. Even if you somehow did level match (difficult because of the mixes are completely different), you'll still score 100%.
I have to agree 5.1 vs 2.0 is easily detectable, provided it's a true 5.1 version of the song and not just "upsampled" from stereo.
foo_abx 1.3.4 reportfoobar2000 v1.2.32013/04/17 02:32:55File A: D:\Music\Ar tonelico I\Ar tonelico Hymmnos Concert Side Crimson ~Tsukikanade~\06. みとせのりこ - EXEC_SUSPEND/..flacFile B: D:\Music\Ar tonelico I\Ar Tonelico Tiny Hymmnos Concert 5.1\03. Mitose Noriko - EXEC_SUSPEND/..flac02:32:55 : Test started.02:33:13 : 01/01 50.0%02:33:31 : 02/02 25.0%02:33:48 : 03/03 12.5%02:34:17 : 04/04 6.3%02:34:34 : 04/05 18.8%02:34:57 : 04/06 34.4%02:35:13 : 04/07 50.0%02:35:32 : 05/08 36.3%02:35:40 : 06/09 25.4%02:35:49 : 07/10 17.2%02:36:02 : 08/11 11.3%02:36:21 : 08/12 19.4%02:36:32 : 09/13 13.3%02:36:50 : 10/14 9.0%02:37:09 : 11/15 5.9%02:37:16 : Test finished. ---------- Total: 11/15 (5.9%)