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However, THX Loudness Plus is not quite as aggressive as Audyssey Dynamic EQ and Dynamic Volume in its default setting so it might work without major issues. This is what Onkyo seems to have done with the TX-RZ50 – bravo Onkyo.Īlthough the issue is that Dirac’s base curve is not quite there when loudness compensation is engaged and might need to be altered for it to work adequately. However, having said all that, loudness compensation is available as part of the THX or Dolby package in the form of THX Loudness Plus and Dolby Volume, which the receiver manufacturers could re-introduce and would be compatible with Dirac. Read more about Loudness Compensation and why it is important here. In fact, I find that a lack of research in this area is a step or two backwards compared to what THX and Audyssey has done. This is a complete misunderstanding of how the human auditory system works and is going into the wrong approach. Instead, Dirac has gone towards creating a base “house curve” with a lifted low end and allows the user to do the same. Secondly, and this is a huge one for me, there is no loudness compensation technologies like Audyssey Dynamic EQ / Dynamic Volume or YPAO Volume, which I think is absolutely critical for accurate cinema sound. It is something that equipment manufacturers have to integrate themselves – some do it more successfully than others. However, my main issue with it is the lack of advanced base management integrated into the package. It is a truly impressive technology.ĭirac is also great in the subwoofer region – does as well as Audyssey and definitely much better than YPAO. So Dirac Live is simply excellent in creating pinpoint imaging and therefore helps with steering of multi-channel soundtracks. Still a lack of advanced base management with the integration of 2 or more subwoofers Still a lack of loudness compensation which in my opinion is critical to accurate cinema sound The standard frequency curve is good – without loudness compensation The best imaging between the 3 technologies at the least effort They took their time to arrive at the algorithms they use to create the best imaging they possibly can and it shows. Dirac Liveĭirac Live is laser focused on creating a clean impulse response at the listeners ears and I have to say it is the more advanced between the 3 technologies. While diving into convolution as well as FIR and IIR filters is outside the scope of this article, I hope this gets you started if you are interested in finding out more. To do this, they use a mathematical tool called convolution and affect the impulse response of the loudspeaker in both the time and frequency domain.
So modern room correction technologies focus on both phase and time-alignment issues as well as the frequency response and take the loudspeaker system and the room as one system while doing so.
If it did, it would affect imaging and steering in multi-channel soundtracks. This is why – for example – you never see YPAO making pin-point accurate changes with its PEQ system. What is more, using frequency-based corrections such as GEQ but especially PEQ can make these issues much worse affecting a system’s imaging.
This is because phase and time-alignment issues caused by crossovers, room modes and first-order reflections will smear the original sound as it hits listener’s ears. However, correcting only the frequency response of a system won’t result in great sound. This can be something as simple as graphic EQ (GEQ) or something a little more sophisticated called a Parametric Equaliser (PEQ). Room correction started out at simply correcting for frequency response anomalies due to speaker and room interactions. Lastly, I have a few gripes with Dirac Live that I would like to see addressed before it takes over the world.
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I also rarely see reviewers fully understanding how to set up Audyssey correctly to level the playing field. I don’t see a lot of reviewers or sites fully explaining the pros and cons of each technology. Since more and more companies are switching to Dirac Live in their receivers – Onkyo and Pioneer being two of the latest ones to do so – I thought it would be important to compare Dirac to Audyssey and YPAO.