I disagree with this statement. I have disabled all DSP on my subs, but had a round with PEQ in the Altitude32 for sub channels pre running Optimizer. This was also based on recommendation from Trinnov, keep in mind - be very careful what you do in PEQ (it is not smart to have much gain). For mine I had direct output (no positive or negative gain for the amplifiers in the subs). I used the default gain for my subs compared to the rest of the channels to apply PEQ filters with negative gain to create a fairly flat curve up to 200Hz for subs. I then ran calibration with Optimizer. So instead of matching level for subs against the rest of the channels; I applied negative PEQ filters for subs to achieve this match. End result; fantastic!In the simplest of terms, It’s best to disable the PEQ on the subs and PEQ from the Trinnov prior to using the optimizer, treating the sub output as a single speaker.
Feedback I have received multiple times from Trinnov regarding PEQ. Apply PEQ pre calibration, always pre