It would have to be a "post decode" type of processing....
Sure. If it is global, then it can occur after format decoding and surround processing but before slicing-n-dicing the signal (bass management, time alignment, etc). However, if it is on a per-speaker basis (as Onkyo/Integra have implemented), then it would have to be one of the last steps before output.
I discussed this with Curt Hoyt, who pointed out that the output signals from the Trinnov process cannot be altered in any way, or it will disrupt the various remapping functions. Same as moving your speakers after alignment. But it is perfectly fine to put it just as Sanjay mentioned--prior to bass management.
BTW, having tone control or manual EQ per speaker brings up an interesting use: timbre matching. Measure a sweep through your centre speaker, measure the same sweep through your left front speaker; adjust the left speaker to more closely match the centre. Then do the same with the left front and left side, working your way around the room.
I thought that's Trinnov's job
. It seemed to do that rather well in my short time with a 972. Then the manual PEQ can be a kind of "useful" tone control, and in that case, I'd like it to be ganged across all channels.
But when using Trinnov just for room correction, you should have access to some controls that allow you to shape the sound to taste.
One of the issues with using Trinnov innards for user taste adjustments is that those tweaks cannot occur in real time. You can make an adjustment in a menu, but you will not hear it until Trinnov recomputes the filter coefficients. So it's better to keep user tweaks in a separate module ahead of the Trinnov -- unless of course what you're adjusting is part and parcel of Trinnov's unique process.
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