AFAIK, THX Ultra and Select are certification processes. BUT they do add to
the decoding scheme. In Pro Logic, for example, THX applies decorrelation to
the surround channels, diffusing the mono channel and preventing sound
localization. It also does a re-eq on the original sound tracks to tame
highs. There are a couple of other things it does which I don't remember all
too well. And I haven't found out what THX does to 5.1 systems besides
setting quality standards.
THX Ultra is the standard for home theater of the highest caliber; THX
select is the cheaper variation. Some of the things the standard dictates
are bipolar speakers, a subwoofer that can put out x dB at y frequency
(don't quite remember that), THD levels below a certain threshold, and
enough amplification for the works to function correctly. One problem: Buy a
non-THX certified component (for example, the speaker system), and the
results won't be what you would expect from THX.
The only reason I might go for THX is because of the "EX" feature, actually.
Francisco.
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, January 29, 2001 5:49 PM
Subject: MD: THX Certified?
>
> Please clarify....Don C. suggested that THX certified equipment has
> nothing to do with processing, but the certification is a set of
> guidelines required to achieve an " optimal" theatre sound. Then what
> exactly makes an audio receiver THX certified? And why suggest to the
> McIntosh amp owner to listen to the THX module before purchasing one and
> listen to the differences?
> Is a THX certified receiver merely a marketing ploy, or is there
> actually an EQ applied, or some other DSP application VS any other 5.1
> receiver? Seems to me there must be a difference in the processing
> somewhere?
> Mark Dottle
>
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