diffuse field equalization:
Information from the company "Bayerdynamic" on the DT990 PRO:
| "The Bayerdynamic DT 990 PRO has a passive diffuse field equalization, the acoustic frequency response is already constructively linearized in the receiver system. For this purpose, intensive tests were carried out with several people, each of whom wore a special measurement microphone in the auditory canal, in order to be able to include the different types of hearing in the linearization. The test persons were exposed to sound in a reverberation room with diffuse sound distribution, hence the name “diffuse field equalization”. The DT 990 PRO has been optimized accordingly so that the averaged frequency response of all test subjects is as close as possible to the ideal curve. The method of diffuse field measurement was developed by the Institute for Broadcasting Technology (IRT) in Munich in cooperation with Bayerdynamic. The measurement of characteristic values is stipulated in the IEC 268-7 standard.” |
diffuse field:
Sound propagation in a "normal" room. By throwing back from the walls etc. a sound field throughout the room. The sound "diffuses".
A diffuse-field equalized pressure receiver is tuned in such a way that the frequency curve has a smooth course for diffuse (all-round) incidence of sound. For frontal sound incidence, one obtains this as a result of the pressure build-up in front of the Membran an increase in the frequency curve for high frequencies.
Loudness diffuse field equalization:
In an anechoic (“anechoic”) measuring room, many loudspeakers emit noise signals independently of one another. This sound information meets in the central area of the measuring room and is superimposed to form a "diffuse field" in which it is no longer possible to determine the direction from which the sound is coming. In the third-distance, this noise is varied one after the other, played back alternately via the loudspeakers and the headphones to be measured.
A large number of subjects now assess the volume difference between spatial noise and the noise in the headphones. The desired ideal condition is the same volume impression between the diffuse field and the headphones. In use, there is a much more spatial impression and improved front-back localization (out of head localization). To put it simply: the sound happens outside of the head, not limited to the space between the ears.