» 18 Déc 2014 19:53
Lorsque j'avais reçu la courbe de réponse de mon hd800 de sennheiser, j'en avais profité pour leur demander des précisions sur leurs process de mesure et sur le diffuse field; après une 1ère réponse où ils m'ont invité à visiter leur unité de fabrication, ils ont transféré mon mail à leur équipe de fabrication; j'ai reçu cette réponse aujourd'hui, intéressante pour les techniciens qui comme moi s'amusent à mesurer un peu tout et n'importe quoi, dont les casques, lol:
>>>>> The acoustical diffuse field represents the situation in a normal listening room (e.g. living room) where the listener is not listening to the music from the speakers under free field conditions, without reflections, but in a more or less reverberant environment.
The diffuse field response of headphones is the deviation of the measures sound pressure level of headphones on a dummy head compared to the sound pressure level measured by the same dummy head in a diffuse sound field.
It is much more difficult to measure the loudness diffuse field response of headphones, but this method represents the acoustical impression of a pair of headphones in the best way.
A minimum of 16 test persons compare the loudness impression of the headphone with the impression of a diffuse sound field 1/3 octave by 1/3 octave. From 100Hz to 12.5kHz. The averaged (all test persons) deviation to the diffuse sound field is the loudness diffuse field response of these headphones. The individual graph that we send to HD 800 owners is made using the loudness diffuse field response of the HD 800 Reference Sample plus or minus the difference of the coupler frequency response of the individual headphone to the coupler frequency response of the HD 800 Reference Sample.
Sounds complicated? Yes, it is!
Viele Grüße
Axel Grell
Product Manager>>>>>>>>>>>>