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Is one more commonly needed than the other?
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There's a regularly updated thread in Software that lists discs encoded with DD EX and DTS-ES. Judge for yourself:
http://www.hometheaterforum.com/htfo...ighlight=dtses
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If a unit has DTS ES and not DD EX, is that a big deal?
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I've never heard of such a unit. If a unit can do DTS-ES Matrix, it can also do DD EX. The difference comes with DTS-ES Discrete; not all units can do that, although, as Kevinkall notes, it's becoming more common and more affordable to have all of these modes included.
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Will I still be able to upgrade to 6.1?
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Most receivers aren't upgradeable.
I'm going to repeat what I said above:
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My advice is not to let these formats drive your choice of receiver. There are many other more important factors to consider in selecting a receiver
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M.