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In Reply to: Re: Upgade from 2 Chn to HT posted by michael w on June 01, 2001 at 07:55:56:
>> And yes, I would wait for ProLogic II.
It should improve the performance of all your analogue stereo sources. <<How does that work? I'm not familiar with DPL II, but I have heard stereo played through DPL and it was wretched.
Follow Ups:
Agreed, music thru normal DPL sounds awful.Basically DPL II is a continuation of the surround work pioneered by Jim Fosgate in the processors that bore his name and the discontinued Citation stuff.
In simple terms it takes a 2 channel source and fakes it into a signal with pseudo stereo surrounds and none of the bandwidth limiting of std DPL.
Incorporates a Movie mode and Music mode.
Technical info can be found at the Dolby site and at Fosgate's new site.
http://www.dolby.com/ht/
http://www.fosgateaudionics.com/home/index.asp
As well as the high end processors already out (Meridian, TAG McLaren),Fosgate has several DPL II decoders due soon, including a tube model and mainstream manufacturers like Kenwood are including DPL II ddecoding in this season's receivers.
cheers
michael w
Thanks for the links. I only read the Dolby article, which answered everything I wanted to know about DPL-II. It obviously addresses most of the flaws in DPL. The one flaw that may remain to interfere with surround music, as opposed to movies, is the reliance on phase manipulation.As stated in the Dolby article, when a product is mixed for the surround mode it will be played back on, the results are predictable. When a stereo source is played back in surround, no one knows how it will translate. The more manipulation the decoder applies, the less predictable the sound will be. I've enjoyed listening to some stereo music in surround sound in the past. Electronica and classical symphonies can sound quite interesting. But I prefer to listen in a mode that features passive processing, in other words, the original Hafler mode or its variations (e.g. NAD EARS mode).
DPL simply degrades the sound when it tries to steer the stereo's natural ambient phase info. DPL-II should be better, but active matrix phase manipulation still seems to me to be the wrong direction for stereo music. It should be a wonderful for VHS movies. It's a pity it only came along after the introduction of discrete multi-channel DVD's.
In the past I've played music on active decoding surround systems and have much preferred the passive approach.I used to have one of the old Dynaco passive decoders which did a better job on music than the Fosgate I had at the time. Movies are another story though.
The only active decoder I've heard that didn't ruin music playback was the old Rocktron(?) Circle Surround one .
cheers
michael w
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