Sound calibration: Difference between revisions

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Created page with "==Introduction== % impedances and sensitivity @ 1mW and @ 1V % Model Impedance Sensitivity Sensitivity Audiological % (Ohm) @ 1mW (dB SPL) @ 1V (dB SPL) SPL) % ------------------------------------------------------------------------------------------- % AKG_K271_MKII 55 91 104 (+12.5 dB) N % SENNHEIS..."
 
 
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==Introduction==
==Introduction==
% todo


==Sensitivity of speakers==
*In all our labs we use the Cambridge Audio MINX MIN12 speaker.
*The speaker has a specified sensitivity of 86 dB SPL (@2.83 Vrms input and @ 1 kHz)
*The calibration is calculated @ 1Vrms input and depends one over the square of the distance of the speaker to the center of the subjects head.


% impedances and sensitivity @ 1mW and @ 1V
    Calibration = mag2db(db2mag(Sens@1V)/Distance^2)
% Model                     Impedance       Sensitivity      Sensitivity      Audiological
 
%                          (Ohm)           @ 1mW (dB SPL)   @ 1V (dB SPL)                                             SPL)
Table: calibration (@ 1Vrms and 1kHz) in different labs. 
% -------------------------------------------------------------------------------------------
 
% AKG_K271_MKII             55               91               104 (+12.5 dB)      N  
{| class="wikitable"
% SENNHEISER_HD600         300             (92)               97 (+5.2 dB)      N
! LAB
% SENNHEISER_HD100         26             (94)               110 (+15.8 dB)      N
! Distance (m)
% BEYERDYNAMIC_DT_770_PRO   80               96               (107) (+11.0 dB)      N  
! Calibration(dB SPL)
% SENNHEISER_HDA280         37             (103)               117 (+14.3 dB)      Y                        
! Measured (dB SPL)
% SENNHEISER_HDA300         23             (108)               124 (+16.4 dB)      Y  
|-
% RADIOEAR_P4492           10             (107)               127 (+20 dB)        Y
| TEST LAB
% TELEPHONICS_TDH-39P       10             (108)               128 (+20 dB)        Y
| 1.00
% -------------------------------------------------------------------------------------------
| 80
% Sens(1V) = Sens(1mW) + 10*log10(R/1000)
| ?
|-
| AUDITORY PERCEPTION LAB
| 1.05
| 76.1
| ?
|-
| AUDITORY SPHERE LAB
| ?
| ?
| ?
|-
| AUDITORY MOTION LAB
| ?
| ?
| ?
|-
| NIRS EEG LAB
| ?
| ?
| ?
|-
|}
 
==Sensitivity of headsets==
A commercial headset normally have a higher impedance than an audiological headset and therefore a higher sensitivity.
 
Table: impedances and sensitivity @ 1mW and @ 1V for Headphones measured @ 1 kHz
{| class="wikitable"
! Model
! Impedance (Ohm)
! Sens@1mW (dB SPL)
! Sens@1V (dB SPL)
! Difference (dB)
! Audiological
|-
| AKG_K271_MKII
| 55
| 91
| 104
| 12.5  
| N
|-
| SENNHEISER_HD600
| 300
| (92)
| 97
| 5.2
| N
|-
| SENNHEISER_HD100
| 26
| (94)
| 110
| 15.8  
| N
|-
| BEYERDYNAMIC_DT_770_PRO
| 80
| 96
| (107)
| 11.0  
| N
|-
| SENNHEISER_HDA280
| 37
| (103)
| 117
| 14.3  
| Y
|-
| SENNHEISER_HDA300
| 23
| (108)
| 124
| 16.4  
| Y
|-
| RADIOEAR_P4492
| 10
| (107)
| 127
| 20  
| Y
|-
| TELEPHONICS_TDH-39P
| 10
| (108)
| 128
| 20  
| Y
|}
 
*The numbers are from the specs on the internet.
*The numbers between brackets are calculated from the difference between the 1mW and 1V sensitivity by: Sens(1V) = Sens(1mW) + 10*log10(R/1000)

Latest revision as of 12:12, 25 April 2025

Introduction

% todo

Sensitivity of speakers

  • In all our labs we use the Cambridge Audio MINX MIN12 speaker.
  • The speaker has a specified sensitivity of 86 dB SPL (@2.83 Vrms input and @ 1 kHz)
  • The calibration is calculated @ 1Vrms input and depends one over the square of the distance of the speaker to the center of the subjects head.
   Calibration = mag2db(db2mag(Sens@1V)/Distance^2)

Table: calibration (@ 1Vrms and 1kHz) in different labs.

LAB Distance (m) Calibration(dB SPL) Measured (dB SPL)
TEST LAB 1.00 80 ?
AUDITORY PERCEPTION LAB 1.05 76.1 ?
AUDITORY SPHERE LAB ? ? ?
AUDITORY MOTION LAB ? ? ?
NIRS EEG LAB ? ? ?

Sensitivity of headsets

A commercial headset normally have a higher impedance than an audiological headset and therefore a higher sensitivity.

Table: impedances and sensitivity @ 1mW and @ 1V for Headphones measured @ 1 kHz

Model Impedance (Ohm) Sens@1mW (dB SPL) Sens@1V (dB SPL) Difference (dB) Audiological
AKG_K271_MKII 55 91 104 12.5 N
SENNHEISER_HD600 300 (92) 97 5.2 N
SENNHEISER_HD100 26 (94) 110 15.8 N
BEYERDYNAMIC_DT_770_PRO 80 96 (107) 11.0 N
SENNHEISER_HDA280 37 (103) 117 14.3 Y
SENNHEISER_HDA300 23 (108) 124 16.4 Y
RADIOEAR_P4492 10 (107) 127 20 Y
TELEPHONICS_TDH-39P 10 (108) 128 20 Y
  • The numbers are from the specs on the internet.
  • The numbers between brackets are calculated from the difference between the 1mW and 1V sensitivity by: Sens(1V) = Sens(1mW) + 10*log10(R/1000)
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