 Although
all frequencies from a live music performance arrive simultaneously
to our ears, this is not the case for sound from your
loudspeakers.
Different delays are introduced at different frequencies due to a
loudspeaker’s mechanical drivers and construction, as well as its
passive crossovers. Consciously or subconsciously this tells us that
what we are hearing isn’t real. This phenomenon is called
group delay, or group delay error.
The DEQX Calibrated™ PDC-2.6P Preamp/Processor measures the
performance of your loudspeakers and corrects group-delay errors by
delaying ‘earlier’ frequency groups up to several milliseconds so
that the slower frequency groups can catch up. In fact,
phase, timing and amplitude (frequency response) are corrected
automatically at thousands of frequencies by precisely the right
amount for each. The result is more natural time coherency without
introducing distortion.1
The PDC-2.6P’s active crossover feature also allows you to properly
integrate one or two subwoofers. Introducing essential
time-alignment and steep high-pass filters to the main speakers
provides a clean transition, while reducing bass induced distortion
from your main speakers. Frequency response, phase and group-delay
errors are all corrected automatically.
You can also measure your room response with the PDC and
automatically set parametric correction, and/or manually set up to
seven EQ bands, adjusting frequency, amplitude and band-width (Q),
graphically and in real-time. The PDC’s remote control even lets you
set three variable bands of DEQX Media Correction EQ that
allows up to 100 settings to be saved for particular recordings or
soundtracks. Or you can simply use it as a quick bass, mid, and high
tone control.
If you’re feeling adventurous you can also implement the PDC’s 3-way
active crossover to provide the ultimate active implementation of
your speakers.2
A typical configuration is to use 2-way for the main speakers and
the third for the subwoofer/s. DEQX’s critically-acclaimed
linear-phase crossovers are chosen by audiophiles and makers of the
world’s best loudspeakers.
3
You will notice further improved imaging and realism, better power
handling and dynamics, and a larger sweet spot due to more natural
dispersion than passive crossovers allow.
You choose if you want a little bit of DEQX or a lot. All software
features come with the standard PDC, so your upgrade path is ready
when you are.
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1 Measured digital path THD+noise is –140dB
2 If you are not technically experienced assistance by a
suitably qualified person is recommended. Contact your local DEQX
representative or
sales@deqx.com
3 Most recently chosen for the “Magico Ultimate” $230,000
reference system. See quote below from Robert Harley,
Editor-in-Chief, The Absolute Sound
State-of-the-art…
 “…I’ve
now heard from numerous highly placed sources in the audio
engineering world that the DEQX DSP process must be considered the
current state-of-the-art bar none”
Read more...
Srajan Ebaen, Editor, 6moons.com ‘The Future of Loudspeaker Design?’
Star Component Award…
 "What
I heard was truly amazing, jaw dropping, illuminating, eye opening,
ear opening…well, you get the picture...Height, width and depth were
all bettered. Instrumental layering became clearer, as well as their
separation. Air around instruments took on a more vibrant quality
and at the same time the instruments themselves took on solidity and
three dimensionality that was beguiling...”
Read More…
Martin Appel, Reviewer, Audiophilia, June 2006
The Bugatti Veyron of Hi-Fi…
 "The
most striking aspect of the Ultimate’s sound was a palpability and
immediacy that went far beyond anything I’ve previously heard in
reproduced music…it was particularly stunning on voice… The second
quality of the Ultimate that is unprecedented in my experience…was
its reproduction of exceedingly fine detail…This ultra-high
resolution was anything but analytical, cold or clinical. This was
resolution beyond any system I’ve previously heard…Delineation of
individual instruments, and the impression of space between those
instruments, was extraordinary…
The Ultimate setup at Wolf's home (with the DEQX crossover) had a
more convincing sense of size, space, and depth on large-scale
orchestral music."
Robert Harley, Editor-in-Chief, The Absolute Sound, "Magico Ultimate
Loudspeaker: The Bugatti Veyron of Hi-Fi", Issue 160, March 2006
The best thing to come down the pike in a long time…
“As the designer…switched from the passive factory crossover to the
active DEQX crossover, I was amazed.”
“The NHT Xd is the best thing to come down the pike in a long
time…Because the Xd’s performance is competitive at the highest
levels, anyone interested in high-quality music reproduction must
hear it.”
Kalman Rubinson, Reviewer, Stereophile Magazine, Equipment Report on
the DEQX Calibrated™ NHT Xd loudspeaker system
“I agree with Kal Rubinson – the Xd system is the best thing to come
down the pike in a long time…”
John Atkinson, Editor, Stereophile Magazine, Equipment Report on the
DEQX Calibrated™ NHT Xd loudspeaker system
Stunning performance…
 "…DSP
speakers from Sonicweld and Wasatch were using the DEQX digital box
to good advantage. Both systems used crossover slopes much steeper
than usual, taking advantage of digital filters with steep slopes
but linear phase. Both speakers have very flat frequency response
and excellent phase behavior. The also have very wide dispersion
patterns…It sounded very smooth all the way up, and indeed offered
quite stunning performance. Neil Gader called it "lovely," and it
seems an apt word. I had the sense of hearing very exactly what was
on the recordings…"
Read More…
Dr. Robert E. Greene, Reviewer, The Absolute Sound Magazine, Issue
161, April/May 2006
The future…
“DEQX (pronounced "decks") has been successfully showing their
active EQ system for several years now, and each time, they push the
envelope forward with a better product and better demo. This year
they topped themselves again and have teamed up with newcomer
Wasatch Acoustics to create a state-of-the-art system comprised of a
modular speaker system with amplification and active digital EQ.
..Even in a small room, the demo was most impressive as we ran
through our "torture CD" demo tracks. As Wes Phillips commented as
we left, "I think we've just been given a glimpse into the future."
Jon Iverson, Editor, Stereophile Online, 2006
Spectacular…
"DEQX is positively spectacular. Before DEQX my system was pretty
refined, but the 'rightness', the 'correctness' and coherency of the
sound through DEQX is amazing.The sound is significantly better -
more correct, balanced, detailed, and live sounding.I found myself
listening to every CD I had, hearing more of the music than I have
heard before, and enjoying it more than I have for years... This
amazing piece of gear is everything promised and frankly even better
than I had hoped for. I am now convinced that for years I have been
chasing flat frequency response at the expense of destroying time
coherence. DEQX delivers it all. Bravo DEQX"
Read More...
Ray Weikel, Director - Strategic Planning, Audio Products, Logitech
Dynamic…
"The sound is incredibly dynamic, and retains the excellence in
timbre, soundstage and imaging that audiophiles covet."
Anthony Kershaw, Editor, Audiophilia, CES 2006 Report - Runner Up
for Best of Show: Wasatch Acoustics’ DEQX Calibrated™ Musina Music
System, January 2006
Incredible…
“...an audio system that virtually eliminates speaker
distortion...the end result is expansive, clean sound that doesn’t
require you to sit in a “sweet spot ” to hear incredible stereo or,
if you choose, multichannel audio.”
Ramon G.McLeod, Editor, PCWorld.com on the DEQX Calibrated™ NHT Xd
loudspeaker system
Powerful…
"The DEQX system was incredibly flexible and powerful in terms of EQ
and room correction."
Jerry Del Colliano, Editor, AudioVideo Revolution.com
Impressive…
 “The
PDC was transparent enough not to mask any of the delicate transient
micro detail or breathy inflections… Bass guitar on this CD is well
recorded and the PDC reproduced it with high levels of detail and
tautness… climaxing guitar riffs in unison with the rest of the
band's frantic antics did not turn to a lump of mush… separation and
nuance were retained pristine… the PDC captured the "liveness'
superbly… localization of the track's multitude of percussive
effects was impressive, with sounds seemingly jumping out of the mix
from everywhere…”
“Quite apart from my observations of improved dynamics, detail,
soundstage size and image accuracy, a word that came to mind when
room calibration and manual EQ were applied correctly was coherence.
The music sounded gelled - not a sum of disjointed instruments
manifested as an amusical phenomenon but a coherent singular event
made up of said instruments in individual existence as spokes on a
wheel and in unison as the wheel itself. The result just
felt/sounded right.”
Read More…
Edgar Kramer, Reviewer, 6moons.com
Abbey Road…
 "We
are mainly using DEQX Calibrated™ for fine tuning the low frequency
issues of the room..."
Peter Mew, Senior Mastering Engineer, Abbey Road Studios, UK
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Used
with the both the
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