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Post by marcl on Nov 14, 2024 10:10:23 GMT -5
So what is different? Anyone? Anyone? Bueller? Two different calibrations with Dirac 3.11. I did the first, uninstalled and reverted to 3.10.10, then uninstalled and reinstalled 3.11 ... and did a new set of measurements. Look at the difference between the large L/R fronts and the Bass Management in the small speakers. Note that Bass Management from small speakers goes to the large front L/R   There is one small difference that does not affect the Bass Management difference. In Cal1 the L/R target is flat. In Cal2 the L/R target has a slight shelf below 100Hz. But ... I had applied the shelf to Cal1 and the Bass Management levels rose proportionately. |
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Post by okjazz on Nov 14, 2024 12:09:33 GMT -5
So what is different? Anyone? Anyone? Bueller? Two different calibrations with Dirac 3.11. I did the first, uninstalled and reverted to 3.10.10, then uninstalled and reinstalled 3.11 ... and did a new set of measurements. Look at the difference between the large L/R fronts and the Bass Management in the small speakers. Note that Bass Management from small speakers goes to the large front L/R View AttachmentView AttachmentThere is one small difference that does not affect the Bass Management difference. In Cal1 the L/R target is flat. In Cal2 the L/R target has a slight shelf below 100Hz. But ... I had applied the shelf to Cal1 and the Bass Management levels rose proportionately. Have done any listening test of the two calibrations? If so, which one did you like the most? The second calibration seems to have flattered some sound frequencies in the base region, filled up some nulls in the 500hz region, and smoothed some roll-offs in the highest frequencies region. |
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Post by marcl on Nov 14, 2024 12:36:54 GMT -5
So what is different? Anyone? Anyone? Bueller? Two different calibrations with Dirac 3.11. I did the first, uninstalled and reverted to 3.10.10, then uninstalled and reinstalled 3.11 ... and did a new set of measurements. Look at the difference between the large L/R fronts and the Bass Management in the small speakers. Note that Bass Management from small speakers goes to the large front L/R View AttachmentView AttachmentThere is one small difference that does not affect the Bass Management difference. In Cal1 the L/R target is flat. In Cal2 the L/R target has a slight shelf below 100Hz. But ... I had applied the shelf to Cal1 and the Bass Management levels rose proportionately. Have done any listening test of the two calibrations? If so, which one did you like the most? The second calibration seems to have flattered some sound frequencies in the base region, filled up some nulls in the 500hz region, and smoothed some roll-offs in the highest frequencies region. Yes, and the second calibration sounds better and is the more "correct" calibration. It did do a bit better job in the higher frequencies too. This was a bit of a trick question. The difference between the two calibrations is not Dirac doing a better job of correcting the bass frequencies. It's related to the legendary Bass Management bug. This is the third time I've documented an effect when going to a Dirac major release where the first measurement and calibration that I do results in Bass Management being broken. The two should not be connected, but they are. The symptom is either as you see here, Bass Management of small speakers is elevated 7-8db higher than it should be by the processor (not Dirac); or the other symptom is that Bass Management does not work at all and bass from small speakers disappears. The difference between the two calibrations is that after having done the calibration with 3.11 ... I uninstalled 3.11, installed 3.10.10, tried to load measurements from 3.11 (which didn't work, because you can't go back from a major release), uninstalled 3.10.10, reinstalled 3.11, took a NEW set of measurements with exactly the same setup as previous and similar flat target curves .... and the Bass Management bug went away. I'm posting this again (hasn't happened in a couple years) in case anyone else runs into this strange phenomenon ... so's we don't chase our tail like I did past few days.  |
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Post by webmst007 on Nov 14, 2024 17:12:09 GMT -5
Hi Marc - once again - thank you for all your practical experiments.
There's really no substitute for real world experiences. 😁💯👍
One factor in these readings I think should also be noted is the inconsistency inherent in measurements of this nature.
A 8kHz signal has only around a 4cm wavelength and a 10kHz sound is only 3cm.
So in theory it only needs a slight change in either recording device (mic placement) or surrounding environment to potentially alter results in a reasonably sensitive calibration system.
Maybe a quick set of Dirac readings at say 5mm changes in mic location would test that theory.
I'm not set up right now to do this - but it might be interesting to see what the effects are.
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