What if the client wants a DSX, Dynamic Volume, and Dynamic EQ, etc.? Is it theoretically possible at all to EQ the system with QSC and/or Dolby Lake and then run Audyssey for those Audyssey technologies? Would that work?
Fair question...method coming. But first, time vs frequency domains. Each has it's own set of pros and cons and with Fourier transforms, it's pretty easy to bounce back and forth betwixt the two. One of the points Audyssey makes, is their ability to examine room response to a higher level of resolution and apply corrections to this higher level of resolution (of course, without specifying exactly what that "level" is). That can be just as good as it can be bad. Applying a high resolution fix (avoiding the "Q" term here), can have very unfortunate down stream impacts on drivers and amplifiers. Another short coming is the Audyssey process considers only room response and does not provide a means to first measure speaker (near field) response in order to constrain its correction. Another example of a short coming, is a case where the user (or "pro" calibrator ... someone who paid to buy the kit) has placed the main free standing speakers within 3' of the front wall. This creates a notch and try as it may, Audyssey cannot correct this. Only a real pro will recognize this has to be addressed by physical means ... moving the speaker or very specialized treatment on the front wall. Attempts to correct this (time or frequency domain) can run the risk of serious problems. FIR filters, IIR filters...again each have their short comings; but, bless the evil marketing department. Real calibration still requires experienced human intervention and must encompass all means available, including, but not limited to, moving the *$(#$ speaker(s).
So now we come to your direct question (don't you just love "what if's"). To achieve the use of Dynamic volume, etc. the process would be to run Audyssey to the six or eight time limit of your pre-pro. Go back into the pre-pro's set up and modify the crossovers to those more correct for the room/equipment being used. Then you want to set Audyssey to default to "flat" rather some other curve. The next step, using conventional measurement equipment and name your poison signal processor (Lake, QSC, Symetrix, etc.) to address the full calibration and deal with issues your particular pre-pro/Audyssey combination cannot handle (like multiple side surrounds, four, five, six subs etc). However, in this case your test signals must be generated externally and passed through the pre-pro. (Many units, like the QSC 322, 922, etc. can generate internal test signals.) You cannot by pass the pre-pro with test signals since you're then bypassing not only your crossovers but whatever Audyssey did and you'll be chasing your tail down in the weeds forever.
Will that work? Yup, it will.
NOTE: if you are using multiple subs or multiple side/rear surrounds beyond what is native to your pre-pro (ie, you are splitting the Left Side Surround channel in three discrete channels external to the pre-pro), you will have to set this up within your external signal processor and set the levels before you run Audyssey. Here's a short, perhaps not complete, method using the pre-pros internal "set levels" test signal:
1. Use speaker set up to set up your speakers (large, small) as you expect to use them and set the crossovers.
2. (We'll use the left side surround as the example). In your external signal processor, mute all but one of the left side surrounds.
3. Set the level for that one side surround...that level MUST be set using the gain control within your external signal processor but using the pre-pro's internal test signal. Once set, mute that speaker and set the level of the next Left Side Surround speaker. Continue until you've done this for all speakers in your left side surround "array".
This process assures you that each of the speaker members of the Left Side Surround channel are set to the same level.
Now you can run your speaker level set up in the pre-pro as you would normally. You'll find your side surround will need some downward adjustment.