Originally Posted by audioguy
I did just that. I selected the lowest provided frequency hoping that this would address the problem. It did not!!
That's disappointing and what I'd call a border-line software glitch if I didn't think it was somewhat intentional. In that case I'll just call it a bad choice that it can't be over-ridden.
After recently calibrating a nice system great/game-room type system with 3 Catalyst 8Cs and SubMersive with Audyssey Pro, it only re-iterated why I'm such a fan of Dirac. I kept saying to myself "I would have been done 1-2 hours ago!"
With that saved time from the speed by which I can adjust and listen to minor changes, the result can be much closer to my ideal as you are able to make many more fine adjustments and direct comparisons. Dirac isn't without a few quirks or need for a few more direct adjustments, but the added flexibility is a huge benefit.
Aligning the distance settings is one issue and then figuring out how to control the two volume controls and keep them in sync is another. A guy on the AVS forum has a Datasat LS10 and he has already done what you are discussing doing. He may be able to provide some insight and assistance.
If you have an Atmos preamp there is no issue with volume control being the 88a will just function as a conventional EQ with the upstream surround preamp handling all source switching, decoding, bass management, and volume control. The only adjustments needed are effective delay and to verify the relative level of the 2 calibrations is lined up.
A local and long time friend is now a DataSat dealer and had a demo of the new LS10 with Dirac included. I see mention of it here in the LS10 thread here as well
. While hardly in the "affordable" range, it's an important step in the non-astronomical direction, and I believe Arcam and AudioControl both have Dirac capable Atmos processors soon to be released.
Reducing the distance between measurements solved my delima for now. My issue is that since I now have a fair amount of experience setting up the Datasat RS20i and understand how much flexibility it has, it is hard to not keep thinking about it as the real solution. For example, on the output preset side, you can use up to 6 PEQ's on any of the channels to make adjustments prior to Dirac doing it's thing. For example, in my uncorrected FR noted above on the left channel, you can see there are a couple narrow peaks of excess room energy on both sides of 100HZ. While Dirac certainly reduces them (probably to the extent of inaudibility), it does not eliminate them. Using two high Q PEQ's can tame them prior to correction and get a much smoother response. That may or may not be a great example as I don't know if or how much doing that would change the actual sonics but it might and by experimentation, I could learn if it actually did. And for a retired, addicted, OCD audiophile looking to extract the very best out of his system, audio Nirvana. Now only if I had not sold my 4 SubMersives
I haven't checked nor even asked, but were you able to confirm if the RS20's internal PEQ was in the loop when Dirac runs its measurements? It's certainly possible with their hardware, but pleasantly surprising if it was actually enabled that way.
By the way, how do you plan to get an impulse signal to the ceiling speakers as neither REW nor OmniMic have the ability to test more than 6 or 8 channels. I know you don't use either of those but I'm curious as I like to check both Audyssey's and Diracs distance measurements and can't do the height speakers.
With the external boxes I can always just pipe an analog signal right into the 88a's input channel, measure the offset between the two and enter that value into the preamp. Of course I guess if you had an Audyssey preamp you could just run a single postion Audyssey cal to get the distances and levels initially set and then turn off Audyssey. Not simple, but all possible options.