Thankfully, JMLC chose to use english as the common language for he event, not altogether surprising given the many nationalities that probably attended.
"N°13 : Stereolab tractrix horn + Vitavox S2 driver
A bell shape frequency response curve with a smooth slope between 2300Hz and
15kHz (easy to equalize). Low distortion (only H2 and H3 components are visible in the
condition of the measurement). Very low H3 level. Some rise of H2 and H3 below 500Hz
seemingly indicating an Fs of the driver around 320Hz.
A very smooth group delay curve but with a bump between 1kHz and 3kHz (related to
some .7ms early reflection/diffraction seen on the spectrogram, probably due to the part
between diaphragm and throat of the horn) .
Clean frequency response . Some reflected energy from mouth to throat due to the
unbaffled truncated mouth of that small horn."
One may question the methodology but there must be some admiration for those involved who organised such a complex and time-consuming event. Is France and Germany the true keepers of the horn flame then, aside from that beam of incandescent light from across the pond?