- May 13, 2021
Got around to updating 4.0 to 4.1 (AutoCal2) Calibration today. Some may be interested in the changes. As mentioned.. the room is in a bit of a mess right now and not in the exact state as it was during the original calibration. So the comparison is not 1:1, but I think the room measurements are close enough to get an idea of the changes.
Most important take away is to review how the major peaks have been handled compared to the previous iteration:
View attachment 147362
Using 4.1 (AutoCal2) - No High Shelf:
View attachment 147363
Open both images in two tabs and Ctrl+Tab between the two. Again, ignore the slight differences outside of the major peaks due to a changing room. The most immediate improvements are the:
* Flatter Sub Response, due to more aggressive use of notches.
* Flatter 100Hz - 1KHz region, also due to more aggressive use of notch.
Amusingly, the Level Comps and Sub Phase was changed; though I'm not entirely sure why. Perhaps it's a at a higher level due to compensating for my next point. Which...
* AutoCal2 now applies a High Shelf. The above screenshot has it removed for easier comparison between the two "Flat" responses. My understanding, based on Mr. Lund's comments, is this is now applied to achieve a flatter perceived sound and applied to rooms which are not your ideal scenario (Certainly not mine, ....) In any case, this is how the response actually looks after a raw calibration:
View attachment 147364
My room was given about -2dB High Shelves around 650Hz.
It's hard to give an unbias and conclusive review at this moment. The first two corrections are honestly very hard to differentiate. The one with the new High Shelf is very obvious, so I'll be listening between this and the flat 4.1 correction over the next few weeks to judge.
Below is from my 8330A+7360A with crossover at 95Hz matched to right speaker using GLM 4.1 with their new AutoCal 2 algorithms. The REW is from my MLP but I used 10 points around MLP for the GLM. I'm not sure that I disabled the high shelf (labelled Hf Tilt 6kHz, -2dB) before measuring with REW, sorry, I believe I did though.
Left monitor got a high shelf tilt, the right did not. Not seen below directly: Left speaker monitor at 2kHz with gain -1.2 and Q 1.7, and right monitor gain -1.4 and Q 1.3
Sounds great, before and now.