FSAF (Fast subband adaptive filtering) measurement

OK so I'm going to take measurements with the microphone and the speaker in the chain. But I wonder why I am getting different results with the Stepped Sine and Log Sweep:





Both taken with microphone 31.6cm from the 5.25" mid-woofer, in vented speaker of 7L. The fundamental in green shows the port tuning frequency of around 45Hz. When taking Sweeps and distortion, the log sine sweep is smoothed at 1/24th octave, I got that from the manual.

On the other hand, the stepped sine is not smoothed. So is the stepped sine more authentic?
After all, the stepped sine seems to reject noise better and can resolve harmonics below the noise floor.

But then the log sweep looks smoother from 2KHz upwards My gate is 9ms, but I thought this only affects the SPL & Phase view... . Is this the result of graphical antialiasing? Or something else?

OK I'm with you.

What about just the frequency response?









Does the 10ms gate create a smoother appearance eg. 2KHz to 10KHz?

Which one is more authentic?

Authentic being true to the original. I'm guessing all these measurements are just estimates of the true frequency response because they're affected by room reflections.

So am I correct then in understanding that a 100Hz resolution means that there are really only 10 data points between 2KHz and 3Khz then? And between 500Hz and 2KHz (2 octave span) only 15 data points? So the Farina exponential sweep shows a smoother response by very nature of Sweep, not because of any graphical interpolation or anti-aliasing by REW. Meanwhile the stepped sine shows a less smooth response due room reflections.

Certainly, I can move the mic closer to get more signal and less room, perhaps to the diameter of the driver cone?

I'm proceeding with caution because, you know, GIGO. When I can get a close match with frequency response with stepped sine and Sweep, then I'll do FSAF and we can the compare all three!