Good for you. Acourate is difficult not because there is anything wrong with it, but because it is a general tool kit, not a ready-made solution. (Yes, like SAP.) I recommend Mitch Barnett’s book, $10 on Kindle. And follow the procedure, don’t try to take shortcuts like I did.
As to your questions:
Do you have any knowledge if Audiolense is supported by Roon ? Or who to ask in the Roon team ?
A. I don’t know Audiolense. @Brian, do you know?
Is convolution a standard format, so if a room correction SW can export convolution, then I’m good to go ?
A. The convolution filters are defined in a PCM file, like an audio file. So I would imagine the odds are good that it is compatible, or at least translatable.
Note that you want to define a convolution file for each resolution (otherwise Roon has to up- or down-sample the filter).
Do implementation of Accurate require much extra power ?
A. No, Roon easily does it. Yes, perhaps more than PEQ, but it is not overly demanding. I have an i5 NUC, and it never gets beyond 10% CPU load.
Would you happen to know if Dirac is a dead end ?
A. Yeees, I think so. In the past, Dirac has been a closed system, cannot export filter definitions to Roon. But I read there is some work on releasing Dirac as an API, I don’t know what that means. But that appears to be runtime processing, so it would not address this question.
Does implementation om convolution in Roon work with HQPLAYER ?
A. Two answers: if you set up HQPlayer as an output device for Roon, which appears to be the normal way, I assume it would work. But I have no direct experience with it. Second, just today, @jussi_laako wrote that he uses Acourate to create convolution filters that are processed in HQPlayer, rather than in Roon.
I’m not using a computer as an endpoint, and never will do, is it a requirement to use a Windows PC as endpoint ? (Roon is on SonicTransporter)
A. Roon does the DSP convolution on the Core, and it works on all core platforms. Provided of course that the SonicTransporter has enough power, I think it does.
Is it OK to use endpoints like UltraRendu?
A. Yes — again, since the DSP is done on the Core, the result is just a standard signal, somewhat modified, sent to the endpoint. The endpoint doesn’t even know it has been modified.
Do convolution work with MQA ?
A. At this point, no. Anything that modifies the signal, even volume leveling, breaks MQA done in a DAC. However, once Roon does MQA processing in software, it is possible they can organize the processing so it does MQA first, and then DSP on the decoded signal. But this is speculation, we know little about Roon’s coming MQA processing. (I have MQA processing in my Meridian equipment, doesn’t work with DSP, I give up MQA for the much greater benefits of room correction (yes, I tested MQA extensively with DSP disabled, the effects are much smaller).
Edit: andybob here. Since Anders wrote this post Roon has released it’s MQA implementation which does work with room convolution.