Sound calibration: Difference between revisions

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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.


Table: impedances and sensitivity @ 1mW and @ 1V for Headphones
    Calibration = mag2db(db2mag(Sens@1V)/Distance^2)


Table: calibration (@ 1Vrms and 1kHz) in different labs. 
{| class="wikitable"
! 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
{| class="wikitable"
{| class="wikitable"
|+ Audiological Data
! Model
| Model                        || Impedance (Ohm) || Sensitivity @ 1mW (dB SPL) || Sensitivity @ 1V (dB SPL) || Audiological SPL
! Impedance (Ohm)
|---------------------------------||------------------||----------------------------||----------------------------||-------------------
! Sens@1mW (dB SPL)
| AKG_K271_MKII                 || 55               || 91                         || 104 (+12.5 dB)            || N
! Sens@1V (dB SPL)
| SENNHEISER_HD600               || 300             || 92                         || 97 (+5.2 dB)              || N
! Difference (dB)
| SENNHEISER_HD100               || 26               || 94                         || 110 (+15.8 dB)            || N
! Audiological
| BEYERDYNAMIC_DT_770_PRO       || 80               || 96                         || 107 (+11.0 dB)            || N
|-
| SENNHEISER_HDA280             || 37               || 103                       || 117 (+14.3 dB)            || Y
| AKG_K271_MKII
| SENNHEISER_HDA300             || 23               || 108                       || 124 (+16.4 dB)            || Y
| 55
| RADIOEAR_P4492                 || 10               || 107                       || 127 (+20 dB)              || Y
| 91
| TELEPHONICS_TDH-39P           || 10               || 108                       || 128 (+20 dB)              || Y
| 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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