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"by the time the reflected hf component arrives, the direct one is gone so there is no combfiltering." = ???????????????

With speaker enclosures of any size I've seen used in a home, the front and rear tweeters are going to be no more than a few feet apart, which means their sounds are going to be a few milliseconds apart and WILL interfere with each other (destructive interference due to out-of phase arrivals at our ears).

You can't improve the treble frequency response accuracy of a speaker by using more than one tweeter.

You CAN create a "spacious" sound effect, which some listeners may enjoy, from front + rear tweeter destructive cancellations (comb filtering)
... but that's a deterioration of frequency response accuracy, not an improvement.

It's very unlikely that the recording or mastering engineer used speakers with rear tweeters to make the recording -- therefore that recording will be altered by playback using home speakers with rear tweeters (or Bose 901'swith rear drivers).

Our ears blend all sounds arriving a few milliseconds apart.
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Richard BassNut Greene
My Stereo is MUCH BETTER than Your Stereo

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