Originally Posted by sierraalphahotel
Does anyone know if the spectrum for adjustment
available in the Trinnov and the anticipated implementation of Dirac in the Theta are comparable in scale
to that possible with one of the QSC DSPs often used by Adam Pelz and Dennis Erskine et al?
Short answer: Yes, they are comparable in range.
Long answer: There are two aspects to adjustment. One is the corrective action applied by the automatic room EQ, and the other is the manual adjustments for target curve preference. In the case of QSC (or any manual PEQ) these are one in the same set of controls, so the scale (or range) is necessarily large enough to accommodate both functions.
The max corrective range of the automatic room EQ filterbank is rarely specified, but it is presumably sufficient to satisfy the algorithm's need for whatever is determined to be a correctable error. After that, the degree of adjustment can be much less than a manual PEQ because it only needs to deal with the human preference issues for alternative target curves. In addition, Trinnov and to a lesser extent Datasat, offer a separate set of manual EQs that can run separate from the room EQ and target curve controls.
There may also be other more subtle aspects to "adjustment" in that automatic EQ purveyors assert that their IIR/FIR filterbanks afford corrective actions more optimally suited to the task than PEQ. I have heard no evidence of that myself, but remain willing to be convinced; and I've seen evidence to the contrary (MultEQ XT). So in my book, if done well, a PEQ such as found in QSC, Synthesis, ADA, or even my humble SSP-800 are equally capable of achieving as much sonic benefit as Dirac or Trinnov, absent pathological flaws.
Ease of setup and fine tuning, now that's a whole different matter.