Sennheiser HE 1 Instruction manual HE 1 - Page 56

Reference diffuse-field frequency response curve, Specifications

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Specifications 54 BFI 1 remote control Transmission Range Power supply infra-red approx. 6 m coin cell, type CR2032, 3 V Reference diffuse-field frequency response curve dB SPL 25 20 15 10 5 0 -5 -10 -15 -20 -25 100 200 HE 1 500 1k 2k HE 90 5k 10k Hz Explanations on the diffuse-field frequency response curve In an anechoic chamber, 8 highly linear loudspeakers emit noise signals independently 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.

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54
Specifications
BFI 1 remote control
Transmission
infra-red
Range
approx. 6 m
Power supply
coin cell, type CR2032, 3 V
Reference diffuse-field frequency response curve
-25
-20
-15
-10
-5
0
5
10
15
20
25
dB SPL
HE 1
HE 90
5k
100
200
500
1k
2k
10k
Hz
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.