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Trinnov Strikes Back at Dirac with New ‘Active Acoustics’ Technology

by February 03, 2023
Contributors: Matthew Poes
Trinnov Strikes Back

Trinnov Strikes Back

We’ve been covering Dirac Live room correction for years. Back in 2014, we interviewed Dirac’s then-CEO (now Chief Product Officer), Mathias Johansson. In 2018, James Larson explained Dirac’s sophisticated calibration and setup features. In 2019, Tony Leotta told us about Dirac Live Bass Control. Last year, I wrote about the upcoming Dirac spatial room correction solution, which abandons the old method of correcting one channel at a time, instead using every speaker in a system simultaneously to optimize the reproduction of each input channel. In January of this year, Wayde Robson explained more about this revolutionary technology, now dubbed Dirac Live Active Room Treatment, which Audioholics founder Gene DellaSala will be testing on the Storm Audio processor in the Audioholics Smart Home. In theory, it could allow users to achieve top-notch sound without relying as heavily on passive room treatment (bass traps, diffusors, and so on). Dirac Live ART will be exclusive to Storm Audio products when it officially launches this spring, but will become available for other manufacturers to incorporate into their products in autumn of 2023.

  Gene and Matthew Discuss Dirac's Spatial Room Correction Capability

Trinnov Demo System

Obviously we at Audioholics are fans of Dirac, but it’s not the only player in town. If you’re considering spending the big bucks on a Storm Audio processor, you’re probably considering a Trinnov processor as well. The French company has been in the audio innovation business for 20 years now, providing both hardware and software solutions for “the world’s most advanced professional music and film studios for production, mixing, and playback,” as well as for “thousands of commercial cinema screens and… the finest residential home theater and stereo systems.” YouTuber Shane Lee, who is a friend of Audioholics, uses a Trinnov processor in his home theater. Last September, when Shane and Gene discussed the game-changing potential of Dirac Live ART, Shane said that he expected Trinnov to announce something similar in the near future. At the time, I thought that was just wishful thinking on Shane’s part, but perhaps he knew something that I didn’t. Fast-forward to the 2023 ISE (Integrated Systems Europe) conference in Barcelona (which is about to begin as I write these words in late January), and Trinnov has announced that the company’s exhibit at booth 2D150 will feature a “new acoustic processing technology, based on years of research.” Trinnov described this new tech as a “digital sound field control system” that “takes the fundamental research of Trinnov in acoustics and signal processing to the next level and effectively eliminates room modes.” Trinnov’s first demonstration of this new technology will be in the context of a no-holds-barred 13.16.6 home theater system assembled in partnership with Sony, Krix (loudspeakers), and the Italian acoustic interior design firm Officina Acustica.

In 2023, we officially celebrate our 20th anniversary as a company. It has been an incredible journey so far and we are proud to celebrate this with style, by unveiling yet another groundbreaking technology. This is a major milestone in our development, and it will further reinforce our singularity and leadership for years to come. …We have reached a point where we believe this new technology has the potential to redefine home theater design. It may well set a new standard, and replace today’s best practices.

— Arnaud Laborie, Trinnov co-founder and CEO

Like Dirac Live, Trinnov’s Optimizer is recognized as one of the best loudspeaker/room optimization solutions available. And like Dirac Live Active Room Treatment, Trinnov’s new break-through innovation functions as “active acoustics.” But they don’t work in exactly the same way. While Dirac Live ART uses every speaker in a system, Trinnov’s solution uses large subwoofer arrays along with a new algorithm and sophisticated processing to control the acoustics of the room. Trinnov’s announcement stressed that this was only the “first iteration” of the company’s new technology, so the specifics of how it works may change over time. According to Trinnov, the new addition to the Optimizer “will rely even more on the fundamental aspects of acoustics and physics,” and has forced its engineering team to “return to their deepest roots and mission of innovating in acoustic field processing.” Laborie says that the new technology is the result of an ambitious research project that began over six years ago, and that the company plans to roll it out selectively, based on specific projects, before finalizing the software and eventually making it a free upgrade for all owners of the company’s popular Altitude16 and Altitude32 home theater processors. But that’s not to suggest it’s anything less than fully operational at this stage. And to prove it, Trinnov will be “demonstrating the technology in an uncompromised environment, delivering the highest possible performance,” according to Laborie. He claims that, as long as minimum required conditions are met, Trinnov’s new innovation can “make the room disappear.”

Traditionally, low frequency reproduction is handled through a modal analysis where resonances are identified in the frequency domain. Through our extensive research and unique expertise in 3D acoustic fields, we propose something different. Our disruptive approach seeks to fully understand and control the behavior of the room in all its dimensions (time, frequency, and the three dimensions of space) so that resonances are removed almost entirely and without artifacts. As our acoustician friends will all agree, you need decent room acoustics to extract the maximum benefit of a technology such as the Optimizer. Similarly, our 3D Loudspeaker Remapping technology requires sensible speaker placement to perform at its best. With this new technology, things are no different. While it will deliver remarkable improvements in most cases, the result will be truly unprecedented with a proper subwoofer implementation in the first place.

— Arnaud Laborie

Krix MX40

Trinnov says that for the best possible low-frequency performance, “optimal design includes individual subwoofer performance, loudspeaker layout, passive acoustics, and digital acoustic optimization.” It goes without saying that any audio product will perform its best when the whole room and all aspects of the system are carefully considered using a holistic approach, and that’s precisely what Trinnov has done with its demonstration system. The three-row, 18-seat theater utilizes three-way, bi-amped speakers for the front stage — Krix’s MX-40 LCR modules — which feature the Australian company’s patented horn design to provide “a uniform, constant directivity pattern, improved frequency response, and extremely low distortion.” The surround and overhead channels will be reproduced by sixteen of Krix’s versatile Hyperphonix 45 speakers. But Trinnov’s new magic will be performed by two enormous subwoofer arrays, each comprising eight Krix Cyclonix 18-inch subwoofers — one array at the front of the room and one at the back. That’s right — this system includes sixteen 18-inch subs!

Trinnov Altitude16

For power, the system uses four of Trinnov’s own Amplitude16 power amplifiers, which allow the smaller speakers to be powered by individual channels, while the screen channels and subwoofers are all bridged. Of course, a sound system like this needs an impressive picture to match, so Trinnov has selected Sony’s flagship GTZ-380 10,000-lumen laser projector ($80,000 without a lens), to blast images onto a 19-foot-wide acoustically-transparent screen from Screen Research. Sony claims that the GTZ-380 is the world’s most advanced compact 4K laser projector, and is capable of reproducing the full DCI-P3 color space without brightness loss. It uses native SXRD 4K panels and a dual laser light source combining blue and red lasers.

Krix Cyclonix 18

Editorial Note from Matthew Poes (Senior Technical Editor, Audioholics) about Double Bass Array

The Double Bass Array is an approach originally popularized in Germany and covered extensively on the AVS forum here in the states.  It comprises an array of subwoofers placed along the front wall in a precise and symmetric arrangement.  In theory this could be accomplished with as little as two subwoofers, but the distance between the subwoofers and their distance to any boundary defines the upper bandwidth over which they can produce a planar wave.  A planar wave can be thought of as a cylinder-shaped wave instead of a spherical wave.  The key to this is that the edges of the cylinder do not reflect.  If you create a full planar bass wave from 100hz to DC, then there will be no reflections from the floor, ceiling, or side walls.  There is no front wall reflection either since the array is mounted on the wall.  This eliminates the vast majority of SBIR effects and room modes.  What is left is only the length mode.  If you copy this array on the back wall, delay the signal to the length of the room, and flip the phase, then the bass is fully canceled by the back wall.  There is now no longitudinal modes either. Because half of the subwoofers in the room are used solely for cancellation purposes, you get no output gain, and in fact, because there are now no reflections, overall bass output in the room is more akin to outdoor bass levels with no room gain.  However, given the large array requirements in the first place, this is rarely a major concern (and rarely are things absolute in acoustics).

A major drawback of the DBA is that the subwoofers must be precisely placed for the concept to work, irregularities in the room may lead to more complex reflections that disrupt the planar waves, and the number of subwoofers needed and their placement are both cost and space prohibitive.  While a very effective tactic, this approach is rarely viable in even the most sophisticated custom theaters.  Prior work by others have shown that DSP processing of the signal to each subwoofer can eliminate the precise location requirements somewhat, as outlined by Adrian Celestinos in his work on Controlled Acoustic Bass Systems (CABS) discussed here. Currently it is unknown the effectiveness of the DSP processing used by Trinnov’s new approach as patents were being processed as we went to press and no further details were possible.  I have reached out to my contacts at Trinnov and will be doing a deep dive into this approach.  I have requested the opportunity to hear this approach as well as possibly test it in my own room once the software becomes available.  It is worth noting that Trinnov will not be providing this as a public beta, rather they will focus on specific projects that can support the double bass array.  Further, the DBA approach is simply the first of many new ways in which bass acoustic control will happen.  As compared to Dirac’s approach, the main drawback of the DBA is that it is only effective to the upper limit of the subwoofers, or around 80hz.  Anywhere that bass directionality is needed would need to go to those speakers respectively and so no active control of reflections is possible. Passive treatment is needed there.  By comparison, since active cancellation signals are being sent to all appropriate speakers, DIRAC is able to work up to 750hz potentially, eliminating the need for passive treatments below that point (at least in theory).  It is possible that Trinnov will have similar capabilities in the future and I hope to continue to work with Trinnov to test each new release and bring my experience and understanding to our readership.

I also want to make a note about what this concept of active cancellation is doing qualitatively to the bass and why you should care. The most important first principle to understand is that bass reflections in a room are actually quite complex.  We really need to divide the problem up into how low frequency reflections play into our sense of speciousness and envelopment and how low frequency reflections can create interference patterns that disrupt the sound quality perception.  These are two different issues and the solution to one can potentially hurt the other.  First let’s focus on this interference issue, which is what most people understand to be room modes and speaker boundary interference effects.  Essentially, bass is bouncing off of the walls, floor and ceiling.  As it then moves past other reflections and the direct sound, it creates constructive and destructive interference or peaks and dips in the response.  Because this is a minimum phase phenomena it also causes bass to vary in the time domain, ringing at peaks and not at dips.  Overall, the average time domain effect of the reflections also causes the bass to drone on a bit.  This can cause a perceived lack of definition or tightness in the bass.  It then makes sense that if we absorb or cancel all of these reflections, the net result is smooth, clean, and right bass at every seat in the room.  Passive approaches are common but as many know, take up massive amounts of space and actually don’t work all that well below 100hz.  You end up needing to give up a ton of space to effectively absorb these reflections.  This creates a problem however, our sense of envelopment or feeling like we are inside of a larger room or space comes from lateral reflections.  Both Trinnov and Dirac are largely eliminating these.  Bass sounds like it is outside basically.  This, in and of itself, is not a good or desirable thing.  Now you could turn down the effective and keep some lateral reflections, but that still turns down the perceived sense of envelopment.  I would argue this is not such a great problem.  Perceiving that we are inside our room is not a great match to the actual venue we are trying to reproduce.  Movies rarely take place in spaces that match our theaters and typically all of the spatial cues, including the low frequency cues, are encoded in the surround track.  Musical events recorded in actual venues and recorded correctly (a big if) also contain all of the low frequency lateral reflections needed to give this sense of envelopment.  Canceling the room out and reproducing it via surround speakers and surround subwoofers is not such a bad idea. However, most studio recordings, some live recordings, and probably some movies lack the low frequency spatial cues needed to perceive this sense of envelopment.  It is likely that this concept of psychoacoustics is not that well understood or a major focus of mixing.  For many, a sense of smooth, tight, and clean bass is far more important that the sense of envelopment, and so the sound quality improvement netted through wave cancellation will outweigh the detriment it could cause. 

reflections

Bass Trap Placement Diagram - courtesy of www.arqen.com

Trinnov Presentations at ISE 2023

Trinnov CEO Arnaud Laborie presented the company’s new technology at ISE during a CEDIA course dedicated to low frequency reproduction called “The Double Bass Array – Next Generation Bass.” The seminar took place Wednesday, Feb.1, at 12:30 in room CC1.4. Other relevant courses include “Subwoofer Room Gain” by Erik Weiderholtz, Perlisten Audio CTO, and “Infra Bass in Private Entertainment Spaces” by Geoffrey Heinzel, partner at Ascendo Immersive Audio GmbH. Arnaud Laborie was also on the expert panel for the seminar entitled “Room Acoustics for Better Bass” on Thursday, Feb.2, at 12:30. If you’re lucky enough to be attending ISE in Barcelona, and didn't miss the chance to be among the first to experience Trinnov’s new technology at booth 2D150, please share your demo experiences with us. Will Trinnov’s new technology prove to be as ground-breaking and effective as we all hope Dirac Live ART will be?

Share your thoughts in the related forum thread below.

 

Matthew J Poes posts on February 04, 2023 21:23
TLS Guy, post: 1589843, member: 29650
That Trinnov approach has been around from some years, and from what I have read is worse than useless. That sounds like a real dead end.

The best approach to getting good bass is ideal room dimensions and low Q speakers. I can tell you that it works. I am enjoying it right now. For the money of that complicated system, the money would be better spent rebuilding the room with ideal dimension ratios. Some people just love gratuitous complexity. The Trinnov system is a dead end and non starter. Go with the physical laws of nature and DON'T fight them!
There is more coming on Trinnov. You are assuming it to be far simpler than it is. It’s not just a double bass array. There is additional sophisticated processing as well. DBA is just a part of the equation.

As for DBA’s being useless, I don’t know where you heard that. It’s extremely effective. Its biggest problem is that it’s very difficult to implement correctly. It effectively removes all low frequency reflections. You end up with only direct LF sound. No modes. The Q is the speaker and the dimensional ratio couldn’t dream of doing that. Room ratios just help avoid compounding modes on top of each other. You still have just as many as you would have. It’s just easier to deal with when they aren’t on top of each other.

I am not totally sold on this myself but not for the reasons you bring up. I am absolutely confident it is an extremely effective means of improving bass. You simply couldn’t get bass that decays as cleanly, is as smooth, or has as large of a sweet spot in any other way. No reasonable amount of acoustic treatment is going to equal it. When the SBA was developed it took something like 2 feet of low density insulation covering the entire back wall to effectively absorb the reflection and it still wasn’t as complete as the DBA cancelation.

Trinnov is being very tight lipped about the new tech and nobody knows very much. I’ve talked to them and they have promised to fill me in soon. Once I have something I can share I will. I also want a demo. I couldn’t make it to ISE and am not sure when the first US project using it will come. Who knows, maybe I can design it. Trinnov is my go to processor generally for custom home theaters so I just need to convince a client they need a massive number of subwoofers.
Matthew J Poes posts on February 04, 2023 21:08
dlaloum, post: 1589826, member: 97313
At a very high level, it seems that Dirac-ART has been developed as a solution that can improve the rooms of most surround sound users…. where Trinnov is catering to the high end dedicated Home Theatre room market…. (no one is going to fit that many subs in their multi-purpose living space!)
Although Dirac's initial launch is on the high end Storm Audio processors, it is likely that it will find its way down to the mid / mass market area, Trinnov's solution has no pretense of competing outside of the “high end”.

It will be interesting to see how the two differing solutions compare in similar high end configurations, but I cannot see myself purchasing a Trinnov solution, whereas I very much can see myself upgrading to DL-ART at some point, based on my expectations of pricing, and my budget.
I think this is overstating what passive acosutics can do to an extreme. This product will be available on cheaper receivers. There seems to be a misunderstanding this requires subwoofers everywhere. There is a difference between benefits from and requires. Having more speakers and subs in more locations increases the benefit. However it works just fine with a normal system. Even a modest 5 channel system with a pair of subs could see fairly sizable benefits.

Dirac has built in protection to help avoid overloading the speakers and clipping the amp. You can manually override this and that could be an issue. However if used on a typical receiver it could work fine without big issues. What happens is that the e degree of cancelation is simply limited to stay worth in the range of the system. During dynamic peaks it may have short momentary periods where the response is just not quite as good as it could otherwise be.

I would love to try to figure out just how many Sabins below 700hz are needed to equal what this active Cancelation method can do. I probably will do that for a video. However it effectively makes the room anechoic at low frequencies. You can adjust it down if you want, but it will fully cancel reflections if you want. To achieve that with off the shelf absorbers is impossible. However if we did something that approximated the degree of improvement it offers, I just went to GIK’s website to price it out. That I would consider a cheap option. Given how significant the effect of ART is, I would argue you need to cover a sizable portion of the side and back walls and use the soffit traps in each corner floor to ceiling as well as along the front, back, and side wall ceiling/wall interface. All of that still wouldn’t equal enough absorption to actually null out the reflections as well as ART can but it would be very good. That’s about $9000 in bass traps. A Storm is $15k or so and you get more than ART for that. Acoustic treatments are just not efficient enough at low frequencies. Active correction like this is far more efficient.
TLS Guy posts on February 03, 2023 21:20
gene, post: 1589674, member: 4348
Just weeks after Dirac officially announced Dirac Live Active Room Treatment, Trinnov has responded with its own announcement: a groundbreaking “active acoustics” technology that promises similar results. Trinnov’s new tech uses two large arrays of subwoofers to “effectively eliminate room modes,” and will be demonstrated at the ISE conference in Barcelona.

Editorial Note from Matthew Poes (Senior Technical Editor, Audioholics) about Double Bass Array
The Double Bass Array is an approach originally popularized in Germany and covered extensively on the AVS forum here in the states. It comprises an array of subwoofers placed along the front wall in a precise and symmetric arrangement. In theory this could be accomplished with as little as two subwoofers, but the distance between the subwoofers and their distance to any boundary defines the upper bandwidth over which they can produce a planar wave. A planar wave can be thought of as a cylinder-shaped wave instead of a spherical wave. The key to this is that the edges of the cylinder do not reflect. If you create a full planar bass wave from 100hz to DC, then there will be no reflections from the floor, ceiling, or side walls. There is no front wall reflection either since the array is mounted on the wall. This eliminates the vast majority of SBIR effects and room modes. What is left is only the length mode. If you copy this array on the back wall, delay the signal to the length of the room, and flip the phase, then the bass is fully canceled by the back wall. There is now no longitudinal modes either. Because half of the subwoofers in the room are used solely for cancellation purposes, you get no output gain, and in fact, because there are now no reflections, overall bass output in the room is more akin to outdoor bass levels with no room gain. However, given the large array requirements in the first place, this is rarely a major concern (and rarely are things absolute in acoustics).

A major drawback of the DBA is that the subwoofers must be precisely placed for the concept to work, irregularities in the room may lead to more complex reflections that disrupt the planar waves, and the number of subwoofers needed and their placement are both cost and space prohibitive. While a very effective tactic, this approach is rarely viable in even the most sophisticated custom theaters. Prior work by others have shown that DSP processing of the signal to each subwoofer can eliminate the precise location requirements somewhat, as outlined by Adrian Celestinos in his work on Controlled Acoustic Bass Systems (CABS) discussed here. Currently it is unknown the effectiveness of the DSP processing used by Trinnov’s new approach as patents were being processed as we went to press and no further details were possible. I have reached out to my contacts at Trinnov and will be doing a deep dive into this approach. I have requested the opportunity to hear this approach as well as possibly test it in my own room once the software becomes available. It is worth noting that Trinnov will not be providing this as a public beta, rather they will focus on specific projects that can support the double bass array. Further, the DBA approach is simply the first of many new ways in which bass acoustic control will happen. As compared to Dirac’s approach, the main drawback of the DBA is that it is only effective to the upper limit of the subwoofers, or around 80hz. Anywhere that bass directionality is needed would need to go to those speakers respectively and so no active control of reflections is possible. Passive treatment is needed there. By comparison, since active cancellation signals are being sent to all appropriate speakers, DIRAC is able to work up to 750hz potentially, eliminating the need for passive treatments below that point (at least in theory). It is possible that Trinnov will have similar capabilities in the future and I hope to continue to work with Trinnov to test each new release and bring my experience and understanding to our readership.

I also want to make a note about what this concept of active cancellation is doing qualitatively to the bass and why you should care. The most important first principle to understand is that bass reflections in a room are actually quite complex. We really need to divide the problem up into how low frequency reflections play into our sense of speciousness and envelopment and how low frequency reflections can create interference patterns that disrupt the sound quality perception. These are two different issues and the solution to one can potentially hurt the other. First let’s focus on this interference issue, which is what most people understand to be room modes and speaker boundary interference effects. Essentially, bass is bouncing off of the walls, floor and ceiling. As it then moves past other reflections and the direct sound, it creates constructive and destructive interference or peaks and dips in the response. Because this is a minimum phase phenomena it also causes bass to vary in the time domain, ringing at peaks and not at dips. Overall, the average time domain effect of the reflections also causes the bass to drone on a bit. This can cause a perceived lack of definition or tightness in the bass. It then makes sense that if we absorb or cancel all of these reflections, the net result is smooth, clean, and right bass at every seat in the room. Passive approaches are common but as many know, take up massive amounts of space and actually don’t work all that well below 100hz. You end up needing to give up a ton of space to effectively absorb these reflections. This creates a problem however, our sense of envelopment or feeling like we are inside of a larger room or space comes from lateral reflections. Both Trinnov and Dirac are largely eliminating these. Bass sounds like it is outside basically. This, in and of itself, is not a good or desirable thing. Now you could turn down the effective and keep some lateral reflections, but that still turns down the perceived sense of envelopment. I would argue this is not such a great problem. Perceiving that we are inside our room is not a great match to the actual venue we are trying to reproduce. Movies rarely take place in spaces that match our theaters and typically all of the spatial cues, including the low frequency cues, are encoded in the surround track. Musical events recorded in actual venues and recorded correctly (a big if) also contain all of the low frequency lateral reflections needed to give this sense of envelopment. Canceling the room out and reproducing it via surround speakers and surround subwoofers is not such a bad idea. However, most studio recordings, some live recordings, and probably some movies lack the low frequency spatial cues needed to perceive this sense of envelopment. It is likely that this concept of psychoacoustics is not that well understood or a major focus of mixing. For many, a sense of smooth, tight, and clean bass is far more important that the sense of envelopment, and so the sound quality improvement netted through wave cancellation will outweigh the detriment it could cause.


60020

Read: Trinnov Strikes Back at DIRAC w Active Acoustics

That Trinnov approach has been around from some years, and from what I have read is worse than useless. That sounds like a real dead end.

The best approach to getting good bass is ideal room dimensions and low Q speakers. I can tell you that it works. I am enjoying it right now. For the money of that complicated system, the money would be better spent rebuilding the room with ideal dimension ratios. Some people just love gratuitous complexity. The Trinnov system is a dead end and non starter. Go with the physical laws of nature and DON'T fight them!
dlaloum posts on February 03, 2023 19:43
At a very high level, it seems that Dirac-ART has been developed as a solution that can improve the rooms of most surround sound users…. where Trinnov is catering to the high end dedicated Home Theatre room market…. (no one is going to fit that many subs in their multi-purpose living space!)
Although Dirac's initial launch is on the high end Storm Audio processors, it is likely that it will find its way down to the mid / mass market area, Trinnov's solution has no pretense of competing outside of the “high end”.

It will be interesting to see how the two differing solutions compare in similar high end configurations, but I cannot see myself purchasing a Trinnov solution, whereas I very much can see myself upgrading to DL-ART at some point, based on my expectations of pricing, and my budget.
jeffca posts on February 03, 2023 18:13
Both of these systems are a one size fits one room/system set up and can't be used in anything less than a very expensive pre/pro by Trinnov and Datasat (maybe one other).

As a proof of concept, they are impressive. As a viable product for anyone, but the most rich audiophiles, they are a failure. Perhaps, 10-20 years from now, audio processing in reasonably priced AV pre/pros will over enough power for this system.

Another idea would be an HDMI breakout box that can be added to your system. Even then, the low number of people wanting to buy that (we're talking maybe a few thousand units possibly) mean that the economics of scale might not apply. It could be pricey.

Honestly, software that could run on a mini PC or Mac that's also playing the movie file with two 8 channel pro I/O boxes would be much cheaper. Of course, set up and usage is not for the faint of heart.

And, then, you still have to have a bunch of subs, a place where to put them and all of the wiring. Nothing about these systems is cost effective or could be used in the average house.

Bottom line: neither Dirac or Trinnov are offering a solution that room treatments couldn't give you for just about the same or possibly better performance for much less than 10% the cost of the systems they are showing.

Does it work? Sure. Is it worth the price? Absolutely not. It's the audio equivalent of the Rube Goldberg machine that has 15 different stages to be triggered to catch a mouse.
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Jacob is a music-lover and audiophile who enjoys convincing his friends to buy audio gear that they can't afford. He's also a freelance writer and editor based in Los Angeles.

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