Sony G90 - Manual (Page 25)

o v e r, detail resolution in the surround channels was excellent.
Moving next to Logic 7, Lexicon’s process for deriving 7
channels from 2-channel or 5.1-channel sources, I found the
effect worked remarkably well on film soundtracks. (Logic
7 enhancements can be combined with some THX process-
ing on discrete 5.1-channel sources such as Dolby Digital
and DTS.) The addition of rear speakers driven with Logic 7
produced a more vivid feeling of sound effects moving
behind me rather than simply stopping near the listening
position. I had a greater impression of the wall behind the
listening seat disappearing. This effect was enhanced by
Logic 7’s other salient attribute, the perception that the
soundstage was continuous from front to rear. That is, pans
were seamless along the room’s side walls, rather than pre-
sented as a discrete jump from the front channels to the
rear channels. In addition, Logic 7 processing widened the
soundstage and created a more expansive feeling. Try the
chase scene in Toy Story (chapters 28 and 29 on the DTS
laserdisc) in which the toy car speeds through traffic; the
“real” cars whiz by as pans from front to rear, an effect vast-
ly more effective with Logic 7 than either straight DTS or
DTS/THX decoding. In addition to these benefits, seven
loudspeakers are, I believe, fundamentally better than five
for film-sound reproduction.
An interesting way to judge Logic 7’s effectiveness is to
compare a full 5.1-channel discrete source with that source
downmixed to two channels, then played back with Logic 7.
H e r e ’s how you do it: Record a section of a film soundtrack
on a VHS machine (or cassette deck) using the MC-1’s “AC-
3 2-Channel” mode. This mode downmixes the discrete 5.1-
channel soundtrack into two channels for recording on a
two-channel medium. Then play back the two channels with
Logic 7 decoding and compare it to the discrete 5.1-channel
source. I did this with the scene in D r a g o n h e a r t in which
the dragon flies 360 degrees around Dennis Quaid. The
sound of its wings beating, accompanied by Sean Connery’s
voice, moves from speaker to speaker around the room sev-
eral times, making it an ideal test of Logic 7 decoding.
If someone hadn’t heard the discrete version, they’d
never think that they were hearing a matrixed format. Logic
7 is that effective in creating the impression of wide chan-
nel separation. Indeed, I found it hard to believe I was lis-
tening to two channels decoded into seven. The channel
separation in the DTS original was better, generating a
stronger illusion of movement, but it was a much closer call
than I would have thought possible.
Overall, Logic 7 provided an impressive enhancement to
film soundtracks. The processing did, however, seem to
make the soundtrack less intimate, as though I were sitting
farther away from the action. The upside of this impression
is that my 14.5 by 21 by 9-foot listening room seemed larger.
I evaluated the MC-1’s DAC quality by feeding it a digital
signal from a Mark Levinson No.31.5 CD transport, then
connected the MC-1’s main outputs to an Audio Research
Reference One preamp. The No.31.5 also drove a Mark
Levinson No.360S digital-to-analog converter, which also
fed the ARC preamp. (Power amplifiers were Audio
Research Reference 600s.) I could thus switch inputs on the
Reference One and compare the No.360S to the MC-1.
Granted, a $5,995 multi-channel processor should be no
match for a $7,995 two-channel DAC, but the comparison
put the MC-1’s performance into perspective.
The MC-1’s sound quality in this evalua-
tion was only fair. The MC-1 overlaid the
music with a grainy texture, with a darkening
of the upper midrange that resulted in a less
palpable rendering. The MC-1’s treble was a
bit hashy, and the soundstage was somewhat flat and
closed-in. These characteristics became apparent when lis-
tening critically to two-channel music sources through a
reference-quality playback system; when listening to film
soundtracks, the MC-1’s sonic shortcomings didn’t intrude
on the experience. I would rank the MC-1’s DAC stage as on
the level of a $500 CD player. (That’s not bad considering
the $5,995 MC-1 has eight DACs and analog line stages, plus
everything else that goes into a sophisticated multi-channel
c o n t r o l l e r. )
The $6,500 Classé SSP-50 controller provides an inter-
esting contrast with the MC-1. The Classé was significantly
better sounding when reproducing music. If the MC-1’s
DACs were comparable to those in a $500 CD player, the
SSP-50 sounded more like a $2,000 outboard converter. The
Classé benefits from an audiophile-quality signal path and a
superb multi-bit DAC stage. That superior two-channel per-
formance is, however, offset by the MC-1’s more sophisti-
cated surround processing, 7.1-channel capability, THX pro-
cessing, vastly better remote and user interface, and propri-
etary Lexicon film-soundtrack enhancements. But that’s the
beauty of diverse design goals: You can choose the product
that best matches your priorities.
If you are uncompromising on both film and music repro-
duction, you can still enjoy the MC-1’s terrific surround per-
formance without shortchanging High End music playback:
run the MC-1’s left and right outputs through a two-channel
analog preamp on the way to the left and right power ampli-
fiers. (The Krell KPS-25S has a “Theater Throughput” mode
just for this purpose. Theater Throughput sets the preamp’s
gain at a set level so you maintain your individual channel-
level calibration when switching back to multi-channel.) Ana-
log source signals that you will listen to in two-channel feed
the analog preamp and never go though the MC-1’s A/D and
D/A stages. Note that adding an analog preamp works only if
you have full-range left and right speakers that don’t require
the MC-1’s front-channel crossover.
Listening To Music Surround
My experience with surround-sound modes on A/V receivers
has left me contemptuous of the concept. The modes sound
gimmicky, often destroy the musicality of the front signals,
and their presence is purely marketing driven. That is, the
receiver must sport a huge list of surround modes for it to be
competitive on the sales floor, whether or not those surround
modes are well thought out or even musically appropriate.
But after living with the MC-1 and reading the superb book-
let explaining the theory behind the MC-1’s surround modes,
I’ve taken a somewhat different view. The MC-1’s modes,
designed by Dr. David Griesinger, are all based on solid
research that relates the physical properties of concert-hall
acoustics with our perception of sound. The MC-1’s effects are
far from marketing gimmicks.
The MC-1 is without question the most sophisticated music
processor available today. But do two-channel recordings ben-
efit from this processing, or is a pure, unadulterated signal path
more musically engaging? Before tackling that question, I