how can see port noise in measures, or how measure port noise best ?

[user44455555]

Hi

In this thread https://www.audiosciencereview.com/...d-which-extension-is-best.72895/#post-2663074 girtab bring suggestion to measure port noise
I try it and when use generator 58 hz sine i hear it clear and loud and much diffrence between 66 db and 84 db output at 1 meter set, but the measures did not show much diffrence. I measure at 4 cm distance and little from side so that the air did not flow direct in microphone. Only there can see much jumps in group delay

 

[John Mulcahy]

Sweep measurements are designed to reject uncorrelated noise. Use the RTA with a tone.

 

[user44455555]

Sweep measurements are designed to reject uncorrelated noise. Use the RTA with a tone.

I do also RTA. see 2.screenshot in the 1 post. it did show fewer. for the rta is used 84 db at 1 meter and at microphone level was 102 db at 58 hz 4 cm. THD N was 0.47% and the harmonics was lower as 0.22%. maybe i need better settings. which ?