Tweeter Too Laid Back

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Could you make a frequency response measurement? That would make it easier to point at the cause.

I associate laid back with [1] a weak treble response, especially at the presence region (2 to 5 kHz), and with [2] a wide treble dispersion.
 
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If you are sure that the problem is the UHF tweeter, then increase C1 from 1.5 uF to 2.2 uF. But it really looks like a problem with the HF tweeter, as TBTL pointed out.

I did bypass R1 for HF tweeter that is a ribbon,The uhf just needs to be louder, it is a Marantz 7012 AVR powering them,and Marantz is known to be way more neutral in sound,but i reverse engineered the Audyssey by covering tweeter some while in calibrating Multi EQ 32,it was better but treble still needs bumping up some,hope that helps some, Thank you
 
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