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Andy,

I do not know how aggressive roll-off on obsolete values as I never cared to calibrate my analyzer/microphone above 10K. Well, it was calibrated a few years back but I never trusted to it as I do not see needs for above 20K lineriarity from listening position. Be advised that I am talking about reproduction not about recordings.

Yes, I did try to run the playback flat in 2001-2002, it was minus 1dB at 20kHz. I think I have now minis 6-8dB at 20kHz, but those number are not firm. You, when we talk about running flat at 20kHz then the first question become not “how flat?” but by “virtue of what?”. In many case the problems that we subjectively hear at 20kHz are not overly excessive amount HF but the pure quality of HF. The question is: can you produce at necessary quality let say above 12kHz? If you do (and very few truly can) then you can drive HF much harder with no negative consequences. With my playback my tweeters do very well, my HF amp is optimized for HF as radical I ever seen (air-cap filter, single stage RF amp direct-coupled via very fact core to HF optimized ribbon), however my electricity is not good for HF. At the good electricity day I might drive tweeter much herder, but this is whole another subject…

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