ART causes noticeable better bass impact, accuracy and "speed". Bass notes seem to have exact position instead of being "all over the room". ART also removes room mode ringing instead of just attenuating its frequency.
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Active Room Treatment (ART) by Dirac
- Thread starter Flak
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Damn. I have 3 subs in my HT, better than 1 but still boomy with lots of overhang. Now looks like I will have to investigate ART options.
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Looking at your measurements, is tge transition zone in your room around 400Hz? Can ART go that high?
I think it's below 200Hz. ART can go to 150Hz but decay graphs show it has some effect up to 200Hz.
As filters overlap you will get some effect also next to 150Hz.
You can't make systems like ART working as high as you like. Rooms get chaotic very quickly with higher frequencies and you need stochastic models to work with it - no correction like ART possible any more. It's amazing that they where able to go up to 150Hz to be honest. Maybe they COULD expand it to 250Hz depending on the room but then the transition zone is done.
So a dedicated speaker and room design for Dirac ART would have:
Distributed subwoofers and/or a few fullrange speakers.
Very good absorption down to 150hz so you stay with the low reverb times you get at low frequencies.
This means you need LARGE surfaces with 300mm deep absorption with not to dense acoustic material.
I would design speakers with at least 2 10" drivers for the 7 "floor" speakers which are positioned under and over the mid/high drivers to get rid of some vertical modes from the beginning.
Combined this should give a reference listening experience not possible in a small room not too long ago.
You can't make systems like ART working as high as you like. Rooms get chaotic very quickly with higher frequencies and you need stochastic models to work with it - no correction like ART possible any more. It's amazing that they where able to go up to 150Hz to be honest. Maybe they COULD expand it to 250Hz depending on the room but then the transition zone is done.
So a dedicated speaker and room design for Dirac ART would have:
Distributed subwoofers and/or a few fullrange speakers.
Very good absorption down to 150hz so you stay with the low reverb times you get at low frequencies.
This means you need LARGE surfaces with 300mm deep absorption with not to dense acoustic material.
I would design speakers with at least 2 10" drivers for the 7 "floor" speakers which are positioned under and over the mid/high drivers to get rid of some vertical modes from the beginning.
Combined this should give a reference listening experience not possible in a small room not too long ago.
Vacceo
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That is quite insane on the low frequencies!
Now, question, what frequency response should speakers have to be effective?
I guess that ideally, every speaker should be 20-20k Hz but realistically, what would you say it would be fine to get good results?
Difficult to say, every room is different. And the situation is also different if you have subwoofers.
Here is Dirac ART with just 2 speakers. 2-way JBL L20 bookshelf speakers with 6.5" woofer, specs 65Hz to 20kHz . The room has strong room mode at 38Hz.
Digital_Thor
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Looks like 2 PEQ's, done with any sensible DSP. Do we need Dirac ART for this?
Would be nice one with Dirac only and another with ART, to see any difference
PEQ is great for evening out overall frequency response, but doesn't solve group delay, can't solve nulls due to the physics of room acoustics, and can't correct impulse response in the time domain.
To be honest my living room has ~200 ms decay time above 150-200 Hz just with bass traps in one of the corners and a lot of furniture around.
It’s not that difficult, but just below 150 Hz it gets diabolically difficult to do anything without sacrificing so much space.
New (quick 3 point) calibration and measurements with Dirac and with ART. Because of small speakers, the real ART magic happens above 45Hz.
Please tell Hobie we’re ready!
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You can pull down peaks with PEQ, but i dont think you will be able to fill the hole around 50-100Hz.
tjcinnamon
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Ha! If you figure out how to do that to the decay, and it works for me then I’ll send you $50
It’s not the frequency response (top line), it’s the lines below it that are the game changer.
No one is telling fans of PEQ not to enjoy PEQ. Enjoy it for what it can do.
What I am saying and what the data in this thread is showing is that with only 2 speakers, ART is doing a great deal more than PEQ without even taking into account the benefits in impulse response. If you want to manage low frequency room modes, you can spend $169x4 to put bass traps in your corners and it appears that you would only get a fraction of the benefit that Dirac ART offers based on the data in this thread.
Is it possible to set up to add the ceiling speaker to active correction if you so wish? Ceiling reflections will usually create a peak around 300Hz and a dip around 150Hz depending on the exact ceiling, driver and MLP height. Maybe the 705i could take care of that?
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