markus
Addicted to Fun and Learning
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Why don’t you summarize them here also?
Too much work I'm still in talks with them so haven't posted my final verdict yet.
Why don’t you summarize them here also?
That would make sense. I would think Dirac designers thought of this and is one reason for their mixed filter approach. Also, they need lower latency to work well with video and even games.
Maybe @mitchco’s charts show more of a Trinnov limitation because it is clearly worse than the PC version w/ plenty of taps. As the DSP guy, I’d love to see him do a head to head of the main DSPs on hardware vs PC. He has seen state of the art results already from Dirac on PC.
As along time Audiolense user I agree with what you are saying. However, both Trinnov and Dirac use IIR filters for the bass. Trinnov lets you set the transition frequency. The default is 150 Hz. Various Dirac processors have a different number of taps to use. The maximum is 3048 taps per channel for 32 channels and is used by StormAudio. The cheaper processors using Dirac have less taps. I think Trinnov uses 4800 taps has a maximum based on the maximum filter length of 100 ms.
One thing rarely shown or discussed is that the phase is not corrected correctly in the bass by any system including Audiolense. The impulse measurement is measuring the energy of the highest frequency of the subwoofer and not the energy at the crossover. Using a dual channel measurement system like SMAART reveals this issue. REW can't show it. The Dirac Live Bass Control does a much better job and implements all-pass filters to address this issue. I've suggested a manual intervention for advanced calibrations when using Dirac Live Bass Control.
It is also important to realize that the higher the sample rate, the less accuracy in low frequency correction with FIR filters if the number of taps stays the same. For 1024 taps, 192 kHz has a frequency resolution of 187.5 Hz. This is one reason why I prefer to use 48 kHz for all content. The article FIR Filter for Audio Practitioners states that frequency resolution of the filter is worse than you say: For a quick and rough estimation, we can multiply the frequency resolution by 3 (three) to predict the effective low frequency limit of the filter. 46.875Hz x 3 = 141Hz. This means an FIR filter with fs = 48kHz and N =1024 will be effective at 141Hz and above.
The largest Audiolense calibration I've done so far is 15 channels. I'm building my own new theater and hope to compare 24 channels of Audiolense vs 24 channel of Dirac correction, but might not get around to it for another year or so.
hopefully you can post a link to your "final verdict" when ready.Too much work I'm still in talks with them so haven't posted my final verdict yet.
hopefully you can post a link to your "final verdict" when ready.
That avs thread is running so fast and going so many directions, it's almost impossible to follow anything
Too much work I'm still in talks with them so haven't posted my final verdict yet.
are your "talks" with them influencing your final verdict?
are your "talks" with them influencing your final verdict?
EDIT: an obscure setting fixes the linearity/muting issue. This setting should be the default, not the other way around
Anyone know if this is fixed by a newer firmware?
There's nothing to be fixed. Any AVR/P has to reliably detect the format of an incoming audio stream. This takes time and results in sound missing at the beginning. If you allow for a less reliable detection method or rely on good faith (input was PCM last time so assume it's still PCM) loud noises might grill your speakers.
Having said that the option for setting detection behavior should be enabled by default though.
I am confused. if this is just an issue with default setting, why the beheaded panther? Is there something else I am missing? Are there other red flags?
No it doesn't. Some processors just don't have enought DSP power for higher sample rates.So Dirac limits sample rates! This could explain why the miniDsp DDRC-88A also has this limit. Doesn't matter to me much personally - I dont think my ears can tell the difference between 16/48 and 24/96 anyway.
Here is something interesting I found on Page 62 (!) of the user manual:
View attachment 82650
So Dirac limits sample rates! This could explain why the miniDsp DDRC-88A also has this limit. Doesn't matter to me much personally - I dont think my ears can tell the difference between 16/48 and 24/96 anyway.
Do you mean control of the LFE low pass filter? I think the Paramteric EQ and to a lesser extent Dirac bass control allow some control over the individual subwoofers.
Not the LFE. My current setup is Subwoofer 1: 80Hz, Subwoofer 2 & 3: 80 - 200 Hz. 2 & 3 are Rythmik FM8. I wonder if I set the crossovers on the physical units, will it auto-calibrate but the Dirac calibration screenshots on the manual don't show subwoofer FR as a selectable option on the right at all to confirm.
Yes.So Subwoofer 1 does 0-80hz and the others do 80-200hz?
Not sure how. I understand with the correct Q value and slope this might be achievable, but its a bit beyond my current level of expertise (or lackthereof)I suspect you can achieve this with Parametric EQ