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How to get multichannel sound from a CD?

I was at a friend's place recently and heard him play CDs through his new Linar multichannel amp, which has the ability to direct part of the stereo signal to the back speakers. The effect was surprisingly good: spatiality and power increased, without any apparent damage to sound quality (as long as the rears were not too loud!).

This got me thinking: Rather than wait forever for the major labels to start releasing good quality multichannel recordings in SACD or DVD-A, why not explore ways to get extra spatiality out of my existing large CD collection?

So I'm looking to find out what options exist for doing this. I'm just gathering info at this point, so any tips you have are of interest--a bonus would be your comments on how good it sounds, but just hearing about an option is good too.

Note that I do care very much about sound quality issues such as timbre, tonality, musicality. The best options for converting CD to multichannel will do minimal/no damage to essential sound quality, but will add spatiality.

So far I know about the following:
-The Linar amps, and maybe other multichannel amps, that just direct the sound to the back
-the Meridian 861 processor has a mode for this. Super expensive, supposed to be good.
-the McCormack universal player has a mode also. Stereophile seemed to like it a bit less than the Meridian for this purpose, but it costs a lot less.
-I think DTS has a processing mode in some receivers which can do this (I'm not much of a home theater guy, no receiver in my system, so I'm sure many of you will know more than I about this).

Any others you guys know about?
calanctus
kr4's avatar
kr4
3,676 posts
 
BTW, it ain't the McCormack universal player that has this but, rather, the McCormack MAP-1 preamp. I use it mostly for TV audio but still play CDs in 2channel and SACDs/DVD-As in surround.

Most current A/V pre/pros and receivers have several options but the best seem to be the Logic7 (Lexicon, HK?, others?) and the Meridian TriField options.

Kal
eldartford
4,262 posts
 
What we are talking about is "matrix multichannel". With most any surround decoding system, Dolby, DTS, etc. signal that is out of phase between the two channels goes to the rear speakers. This is very damatic if you play a Test rrecording that has material recorded inphase, and out-of-phase for phasing check purposes.

The effectiveness when playing music depends entirely on how the particular recording was mixed. Some stereo recordings that were never intended for multichannel playback are, by accident, dramatic. Most don't work very well. There is no way to tell except to try them.
gregmacknass2
17 posts
 
I am using 5 channel stereo using my Yamaha reciever's speaker
outputs as the input on my amplifiers. I personally auditioned
a couple of Dennon recievers at my local hi-fi store and was not that impressed with their sound in 5 channel stereo, plus the Yamaha had better options such as the speaker outputs are switchable (via switch on the back) between 4 and 8 ohms, 30 modes of DSP,higher power rating 100w/ch, and a better price.
All of these were deciding factors in purchasing this reciever. The sound I am getting from my setup it amazing. I hope this gives you some ideas.
Greg
calanctus OP
151 posts
 
Kr4: Right--it's the McCormack preamp, not the player. Thanks for the info on 'Logic7'--most of the reviewers seem to like it.

Eldartford: Do all of the surround algorithms (including Trifield, Logic7, etc.) work the way you describe, with out-of-phase signal going to the rear speakers? If not, perhaps some of them could be more consistently good with different recordings. I'm not really looking for something that is 'hit and miss' the way you describe matrix multichannel; if there aren't any solutions that work consistently well with a wide variety of discs, I may not want to go this route at all.
kkurtis
43 posts
 
An old technology that still works surprisingly well is the Yamaha DSP system in several different options. Rather than try to extract out of phase information, it uses a vast array of measured locations to recreate the enviornment of the listening experience. Generally this uses two front (extras) and two rears. The original concept was to run the front speakers throught the unit but is best used with an extra two channel output into the DSP to keep the front two as pure as possible. This approach offers unlimited processing options but I just use a Jazz and a Chamber setting depending on the music. Since this is infinitly adjustable as both effect and volumn, you can create the effect that best suits your room and expectations. You can put a pipe organ in a cathedral with extreme reverberation and feel you are in a hugh space. These units are often available at Audiogon. I use in-walls and have excellent results. You can also turn it off. I am using Watt-Puppy 7's with high end stuff in an excellent room and the Yamaha adds a little "feel" when I want the ambience of a concert hall or jazz club. The trade offs are more than acceptable. Good luck.
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