Generally, yes. You refer to setting your sub on for Direct but it is not clear to me that you can actually do that.
Yes. That is what direct means: Minimal or no additional processing.
They remain in effect in most AVRs.
Yes. Audyssey precludes tone controls in some AVRs.
If your AVR has multiple Audyssey target curves, you can choose one with less HF rolloff but, otherwise, no.
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