peculiar behaviour! Pos Flaw

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peculiar behaviour! Pos Flaw

Postby kentajalli » Sat Jan 13, 2018 8:49 pm

I have an LG G6+ phone now, and thanx to this forum's instructions, I can now appreciate the full potential of the device's DAC.
I have discovered a very peculiar behaviour from Neutron, I'll try to explain it as simply as I can.
I have down converted DSD/SACD material to 24bit/88.2kHz on my PC and loaded the material onto the phone.
On "Audio Hardware" enabling the "Ultrasonic filter" and setting it at 20kHz (default is a silly 11kHz or so!) causes a sharp high treble roll-off - very audible !
Now I am 57 years old, and it beggars belief that my hearing be so good - so I investigated further - only after 40kHz the audible effect becomes zero!
Is there a flaw in neutron?
Does material encoded in 88.2kHz cause the filters to register half as much ?
Is it the same story on Equaliser bands too?

I think Spectrum analyser's weighting is not sufficient - the bass region is peaking into red all the time, while highest treble region does not even register.
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