master the art of timing


“Something more radical: loudspeaker correction”

DEQX PreMate+ Processor
The audible improvements are more pronounced than switching up cables, server/streamer, DAC or amplifier.… …read more DIGITAL AUDIO REVIEW

“No use fixing the room if you can’t fix the speaker”

DEQX PreMate+ Processor
The DEQX PreMATE+ has proven itself as capable of two distinct things: 1).… …read more DIGITAL AUDIO REVIEW

“An all-out assault on digital playback”

DEQX PreMate Processor
PreMate provide one of the most involving Rock presentations the Wilson Audio Alexia had ever delivered. This was both heard and felt. …read more EDGAR KRAMER, 6MOONS


“The HDP-4 exceeded my expectations”

DEQX HDP-4 Pre-amplifier / Processor
The quality and natural detail were a joy to experience. The soundstage became larger and grew beyond the room boundaries...the DEQX HDP-4 showed itself to be a superb sounding preamp for both analogue and digital sources. …read more AUDIOPHILIA


“We feel there are only advantages”

An Interview with Alan Langford of DEQX
I see this concept expanding in the low to mid-fi markets at a steadily increasing rate with less complex and budget solutions. In the high-end it will be a more bespoke solution provided at the speaker manufacturing level where solutions may be targeted at singular products and situations. …read more LAURENCE BORDEN, DAGOGO.COM


“I was not prepared for what I heard”

DEQX XS-1 USB Audio Option Board
My immediate impression was how more lifelike the sound was. The soundstage, which was already large and impressive, seemed to expand even further. Gains were made in transparency and three-dimensionality. The specificity of images, while already excellent showed further gains. Whether listening to Michael Bublé, Frank Sinatra, Diane Krall or Holly Cole, inner textures and sonic cues that give a live quality to the presentation had become abundantly clear.

The same was true of instruments, whether Miles or Dizzy, their horns were so palpable and alive. Another benefit provided by the card was how well it unraveled musical complexities. Because of the increase in separation, complex musical passages became more understandable and individual voices in choral groups could be heard. Dynamics, again already excellent, also benefitted from the new card. There seemed to be a little more explosiveness to the presentation, more drive available than before. …read more MARTIN APPEL, AUDIOPHILIA


“You really owe it to yourself”

Have the cake and eat it too
If you have been lucky enough to hear the DEQX demonstration at various audio shows, well, you will understand what their line of products are all about. At various audio shows the gents at DEQX would have a pair of typical PA horn-like speakers sitting in the corners of the room (you know the ones you see at a discount store or circus) playing whatever you wanted to hear…with the Mate on Bypass…

When they switched to one of the options that was calibrated to 'fix' or 'correct' for the horn's deficiencies…[and suddenly] warmth, extension, presence, soundstage, coherency, and so on…all the audio-speak things we audio-speak guys are looking for—except they are still horns possessing that horn-like honk. So the Mate is not going to make anyone toss their audiophile speakers for crappy horns. But if it can do that with such a compromised—and yet made to do what they are supposed to do and do it right—design what would the DEQX Mate do with a real speaker designed for music? Well the demo does that too, with say a pair of Gallos, and even then the speakers are transformed into something differently better. Different in terms of the same things one experienced in the PA horns though not to such an extreme, but now in way that makes one want to listen to music while mulling over the idea of what the DEQX could do with their speakers and room.

The DEQX Mate ($4495) is a sort of "simpler" DEQX HDP-4 or the HDP-4 Express in that it has no digital inputs or outputs… no, with the Mate it is all analog in and analog out.

The Mate does do what the other two do in that it corrects for …."the distortion that all speakers make—electro-mechanical devices that they are—and offer room compensation as an added extra. While righting frequency-response errors as other units do, they also uniquely correct critical timing errors by adjusting thousands of frequency groups so that they arrive on time…You really owe it to yourself to hear the DEQX Mate, or the other DEQX products, for yourself. Only then you will realize that it is so hard to go back to what we once believed to be reality. …read more DAVE CLARK, EDITOR, POSITIVE FEEDBACK ONLINE


“I went. I listened. I was amazed.”

DEQX Mate Processor at RMAF 2012
DEQX wins a coveted RMAF Positive Feedback Online Audio Oasis Award. “I admit it: I was very impressed by the demos in the DEQX room, and I wasn’t sure that I would be. But their challenge to hear the difference that DEQX would make to a pair of honky PA horns (the white beasties above) was intriguing. Bel Canto furnished the front-end and amplification of the system. I went. I listened. I was amazed. What can I say? DEQX is real. The difference that their processors make in the quality of audio playback in a given room space is no illusion, and could make a very significant improvement in many listening rooms. So DEQX gets a PFO Audio Oasis Award, easily. …read more DAVE ROBINSON, EDITOR, POSITIVE FEEDBACK ONLINE


“Jaw-dropping demo”

DEQX Mate Processor at RMAF 2012
The most jaw-dropping demo of the show was of the new DEQX Mate speaker and room correction unit. It time aligns not simply the speaker drivers, but the frequencies within each driver. Before correction the Gallo Reference 3.5s ($5995/pair) sounded about like you would expect a speaker to sound like in a hotel room. After both speaker and room correction, the soundstage deepened and the imaging snapped into place. It sounded like a completely different (and more expensive) speaker. …read more FRANK BERRYMAN, ULTRA HIGH-END AUDIO and HOME THEATER REVIEW


“I’m gobsmacked and you can quote me on that!”

DEQX Mate Processor at Rocky Mountain Audio Fest 2012
Hearing the TOA Public Address speakers on the DEQX Mate at RMAF 2012, John asked if he was auditioning the Gallos. No, we replied, it’s the public address horns on the DEQX Mate with filters engaged. He asked again: were we absolutely sure it wasn’t the Gallos? Then, as the DEQX Mate was put into bypass mode, John exclaimed “No way!”
Later, he would detail the experience in Stereophile's coverage of the show: “Bypassing the DEQX Mate resulted in the squawky balance I would have expected from the horns, with no lows or highs. Switching the DEQX Mate back in-circuit gave a sound that was evenly balanced, with good HF extension and enough upper bass to sound convincing. Color me gobsmacked! …read more JOHN ATKINSON, EDITOR, STEREOPHILE


DEQX Speaker Correction: Most Amazing RMAF 2012 Demo

DEQX Mate Processor at RMAF 2012
I must have visited at least 100 demo rooms and booths. But DEQX impressed me more than any of the scores of headphones, speakers, and electronics I heard… Yeah, $4,500 seems like a lot to spend for digital correction, especially when similar (although in my opinion, not as effective) technologies are found in many $500 A/V receivers. But at a show dominated by enthusiasts who think little of paying for the subtle difference a $5,000 digital-to-analog converter might deliver, the massive improvements that DEQX achieves make it feel like a bit of a bargain. …read more BRENT BUTTERWORTH, SOUND+VISION


“If I hadn’t heard it with my own ears
I wouldn’t have believed such a thing was possible.”

DEQX Mate Processor at RMAF 2012
I’m rarely impressed with speaker correction processors, but the DEQX-Mate is a special case. I've heard it work wonders with high-end speakers, but at the show the Mate radically transformed a cheap and awful speaker's sound into something semi-decent.
If I hadn't heard it with my own ears, I wouldn't have believed such a thing was possible. The DEQX engineers must be doing something right! STEVE GUTTENBERG, CNET’S Audiophliac


“Jaw-dropping good”

DEQX Mate Processor at RMAF 2012

From Positive Feedback Online’s Show Report: “DEQX had a demonstration using public address loudspeakers and Gallo loudspeakers and the new DEQX Mate. Damn, amazing stuff, jaw-dropping good.” ” …visit here and scroll down


“May just be the next big thing in DSP technology”

DEQX Mate Processor at RMAF 2012
It comes with a box, a mic and software. The user measures the group delay of their speakers with a series of test tones. Then they use their computer to program the DEQX Mate to eliminate the group delay and tame the major room nodes. It is a 2.1 system that can also solve the problem of a subwoofer being out of sync with the satellites.
In an A/B comparison, this unit improved coherence, stabilized the image with a tighter focus and subjectively cleaner sound through the Anthony Gallo speakers. JIM CLEMENTS, SECRETS OF HOME THEATER and HI-FI CAVE


“For audiophile sound quality, and value, the HDP-Express definitely deserves an Audiophilia star”

DEQX HDP-Express Pre-amplifier / Processor
I encourage the reader to try this out. First, use the DEQX to correct the frequency response and phase anomalies that are inherent in all speakers. The DEQX will realign the timing throughout the frequency range. Then, use the room correction feature. You will find the improvement is amazing. But, if you have speakers that can be bi-amplified, or tri-amplified, or if you are willing to modify them to use the DEQX electronic crossover, you will never want to go back. The difference in clarity, detail and dimensionality will astonish you. Also, you will be surprised in the total lack of digital artifacts in the sound. It is smooth and analog clean. …read more   MICHAEL LEVY, AUDIOPHILLA


“Give that man an Audiophilia Star Component Award”

DEQX HDP-3 Pre-amplifier / Processor
The bottom line is that Kim Ryrie has improved an already outstanding product and created one that blurs the line between digital and analogue. Detail without edginess, unbridled musicality, transparent, dynamic and a level of involvement with the performance that is simply stunning. I’ve tried to describe, using audiophile terminology, what one hears with the HDP-3 processor in your system and words don’t do it justice. It behooves you to try one; once in your system, you won’t let go. Removing it from your system will return you to a duller, two dimensional stereo that’s lost its magic. My system would be lost without it. …read more   MARTIN APPEL, AUDIOPHILIA


“Legend Acoustics‘ Tikandis and the DEQX HDP-3
are a very special combination”

I have never heard better sound in my listening room. The tonal accuracy, frequency extension, and most impressively the ability to pull detail out of recordings was nothing short of astonishing…If you already have your own speakers, the HDP-3 processor can dramatically improve the performance of your loudspeakers.” …read more   DR CHRIS GROPPI, HOME THEATER HIFI


Chris Martens‘ Best of RMAF 2009

Looking to the future, the Legend Tikandi loudspeaker features an all-digital DEQX crossover/DSP box providing preamp, crossover, driver correction, and room/speaker EQ/voicing control functions.” …read more   CHRIS MARTENS, THE ABSOLUTE SOUND


“Some of the best DSP room correction I have heard…
excellent everywhere in the room”

At last year’s T.H.E. show I suddenly heard someone playing a live drum set in one of the surrounding rooms. Having played the drums for 40 years I’m familiar with the sound of a live kit. Turns out it was a pair of Acoustic Zen Maestro speakers ($36,000)…The amplifiers were being fed by the DEQX HDP3 room processor. With its included measuring microphone, the HDP3 first checks the anechoic phase and amplitude response of the speakers …read more   ADAM GOLDFINE, POSITIVE FEEDBACK ONLINE


“What I heard was truly amazing…”

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…Detail levels increased across the entire musical spectrum without adding any clinical edge to the sound. Quite the contrary, an analogue-like smoothness and liquidity pervaded what I heard…

The DEQX shows us that by removing speaker inaccuracies and distortions our listening window becomes clearer and more transparent then ever." …read more   MARTIN APPEL, AUDIOPHILIA


“Listening to my own playing…was like
looking in a mirror, sonically speaking…”

In the world of conventional standalone speaker designs, 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. They also have very wide dispersion patterns, which implies some considerable dependence of the sound on the room characteristics (above the bass, where DEQX room correction was being used). As it happened, the Sonicweld was in a large, heavily curtained room. 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. Listening to my own playing (from REG plays Dvorak, available on was like looking in a mirror, sonically speaking, so exactly did it sound like my own instrument.   ROBERT E. GREENE, THE ABSOLUTE SOUND


Best Sound at CES 2006

Sonicweld takes a systems approach with its active loudspeakers. Not inexpensive at $49,000–$64,000 (depending on subwoofers), the system comes complete with triple ICEpower modules for each quasi-line-array satellite speaker, a Subpulse bass module, and the DEQX PDC (preamp-style functions and digital crossover and room correction). Sonicweld’s trademark CNC aluminum construction throughout is a mindblower.   NEIL GADER, THE ABSOLUTE SOUND


“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. …read more   KALMAN RUBINSON, STEREOPHILE


“Well-defined soundstage with remarkable accuracy, unmistakable depth and dimension”

In Home Theater Magazine, reviewer Chris Lewis gives the DEQX Calibrated™ NHT Xd loudspeaker system an overall rating of 95 and says: “My eyes saw small, unobtrusive, and rather pleasing-looking satellites and relatively compact subs. But my ears heard a full, well-defined soundstage with remarkable accuracy and unmistakable depth and dimension.”   CHRIS LEWIS, HOME THEATER MAGAZINE