Reference Diffuse-Field Frequency Response Curve - Sennheiser HE 1 User Manual

Specifications
54
BFI 1 remote control
Transmission
Range
Power supply

Reference diffuse-field frequency response curve

dB SPL
25
20
15
10
5
0
-5
-10
-15
-20
-25
100 200
HE 1
Explanations on the diffuse-field frequency response curve
In an anechoic chamber, 8 highly linear loudspeakers emit noise signals inde-
pendently of each other. In the central area of the chamber, the various sound
data meet and are superimposed on each other to form a diffuse field, in which
it is no longer possible to determine from which direction the sound is coming.
This noise is then varied in distances of a third and reproduced alternately
over the speakers and the headphones to be measured. A large number of test
persons then evaluate the difference in volume between the room noise and
the noise in the headphones.
The ideal state is when the volume impression between the diffuse field and
the headphones is the same. Diffuse-field equalized headphones provide
a clearly more spatial impression and make it easier to determine whether
sounds are coming from the front or rear. Put simply: The sound events take
place outside the head and are not confined to the space between the ears.
infra-red
approx. 6 m
coin cell, type CR2032, 3 V
500 1k 2k
HE 90
5k 10k Hz