There are some new
measurements of the AVAA C20 made by Sound & Recording. As this is only the preview showing the data without going into detail about the setup and method, I cannot say exactly how they were made. The full article explaining this is in Sound & Recording 11/2019.
From what I can tell, they seem to be made in their listening room which they use for subjective evaluation of speakers/monitors
with theoretical frequency response at presumably the listening position in the frequency range of interest (~ 0 to 500 Hz)
Translation said:
I: Pressure regime, II: Resonance regime, modal structures, III: Statistical regime, diffuse sound field.
Room: 6.2 x 3.4 x 2.5 m (L x W x H) (Volume = 52 m^3) with RT = 0.2 s.
From I to II at 27.5 Hz (wavelength = 12.4 m)
From II to III at ca. 125 Hz
Frequency response of (multiple, presumably two) Neumann KH310s at listening position
with (red) and
without (blue) AVAA C20
Spectrogram of (multiple, presumably two) Neumann KH310s at listening position without AVAA C20
Spectrogram of (multiple, presumably two) Neumann KH310s at listening position with AVAA C20
Frequency response of subwoofers (unspecified but according to figure text multiple) at listening position
with (red) and
without (blue) AVAA C20
Spectrogram of subwoofers at listening position without AVAA C20
Spectrogram of subwoofers at listening position with AVAA C20
I got access to the image links through the source code since the links are not accessable for me directly through the website.