I am listing titles that have been deemed by others to be suspicious. Please keep in mind that for some titles, it is entirely possible that Media Blasters got Japanese mono masters but still got stereo voiceless elements, or mono voiceless elements despite the original audio being stereo. This may not be known for certain but many fans believe it is time to demand a minimum of a stereo sound track if stereo is available in Japan.
Please keep in mind that some of these title reports haven't been thoughroughly validated, often reported by only one person. Because people can make mistakes, I would like to see multiple people verify each particular title, and I would also like to see reports of whether the Japanese laserdisc / DVD / TV broadcast was truly stereo or not. Any constructive clarification, confirmation and additional information is appreciated.
A lot of people have used a lot of different methods, some of them pretty meticulously documented, to confirm that Twelve Kingdoms is in mono. The only significant dissenting opinion comes from Media Blasters themselves. So far their hedged responses have mostly been in blaming user's equipment for having faulty ProLogic decoders. This argument does not work as so many people have concluded this both with and without ProLogic decoding available to them. Granted, a few of the titles on this list may have been originally made in mono, but several of them were surely available in stereo.
Anime On DVD member xelloss was kind enough to compile most of the following list, names given are those of other AoD members that contributed reports. I have added some entries and sorted for alphabetical order. At least one person speculated that something started happening about near the mid-way point of the Berserk release, where a lot of MB titles released from the time of volume 3 and on were affected in some way. Does Media Blasters credit their DVD authoring crew and equipment? Maybe someone can track if this can be tracked to a person, group or piece of their equipment doing this so the problem can be corrected so future volumes do not have this problem.
List of titles:
Berserk Vol. 3 - ENG mono, JPN stereo (thanks Tetsuken for the Berserk tests)
Berserk Vol. 4 - ENG stereo, JPN mono
Berserk Vol. 5 - ENG mono, JPN mono
Berserk Vol. 6 - ENG stereo, JPN mono
Gokudo Vol 6
Idol Project (Thanks Stephen Maxson)
If I See You In My Dreams, OAV and TV - ENG stereo, JPN mono (JD: reported by ehchan)
Magic Users Club - Vol 1 (English Only. Japanese is Stereo)
Mirage of Blaze Vol 1 (English only. Japanese is stereo)
Mirage of Blaze Vol 2 (Both audio tracks).
Samurai Deeper Kyo Vol 1
Samurai Deeper Kyo Vol 2
Space Pirate Mito - Vol 1 (Thanks to Tetsuken and Atomsk)
Twelve Kingdoms Vol 1 (JD: the creditless opening is stereo, main show is mono, some have confirmed that the R2s and fansubs are stereo)
Weathering Continent
Virtua Fighter Vol. 1 - ENG stereo, JPN mono
Virtua Fighter Vol. 2 - ENG stereo, JPN mono
Y's volume 1 - JPN track may be mono, ENG stereo (JD: reported by nykk79, I confirmed, Thanatos confirms the JP LDs are stereo)
Y's Vol. 2 - ENG stereo, JPN mono
Y's II - ENG stereo, JPN mono
Zenki Saga 3 (nykk79)
Media Blaster Series Sampler DVD
Remember the MB Series Sampler DVD? It came with Berserk 5 and 6, The MUC brick, and a few other titles. This DVD has an Episode of each of ther following:
Babel II
Cosmo Warrior Zero
Genma Wars
Miku
Space Pirate Mito (already confirmed as mono)