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. | |||
Calibration = mag2db(db2mag(Sens@1V)/Distance^2) | |||
Table: calibration (@ 1Vrms and 1kHz) in different labs. | |||
{| class="wikitable" | {| 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" | ||
! Model | ! Model | ||
! Impedance (Ohm) | ! Impedance (Ohm) | ||
! | ! Sens@1mW (dB SPL) | ||
! Sens@1V (dB SPL) | |||
! | ! Difference (dB) | ||
! Audiological | ! Audiological | ||
|- | |- | ||
| AKG_K271_MKII | | AKG_K271_MKII | ||
| 55 | | 55 | ||
| 91 | | 91 | ||
| | | 104 | ||
| | | 12.5 | ||
| N | | N | ||
|- | |- | ||
| SENNHEISER_HD600 | | SENNHEISER_HD600 | ||
| 300 | | 300 | ||
| 92 | | (92) | ||
| | | 97 | ||
| | | 5.2 | ||
| N | | N | ||
|- | |- | ||
| SENNHEISER_HD100 | | SENNHEISER_HD100 | ||
| 26 | | 26 | ||
| 94 | | (94) | ||
| | | 110 | ||
| | | 15.8 | ||
| N | | N | ||
|- | |- | ||
| Line 91: | Line 80: | ||
| 80 | | 80 | ||
| 96 | | 96 | ||
| | | (107) | ||
| | | 11.0 | ||
| N | | N | ||
|- | |- | ||
| SENNHEISER_HDA280 | | SENNHEISER_HDA280 | ||
| 37 | | 37 | ||
| 103 | | (103) | ||
| | | 117 | ||
| | | 14.3 | ||
| Y | | Y | ||
|- | |- | ||
| SENNHEISER_HDA300 | | SENNHEISER_HDA300 | ||
| 23 | | 23 | ||
| 108 | | (108) | ||
| | | 124 | ||
| | | 16.4 | ||
| Y | | Y | ||
|- | |- | ||
| RADIOEAR_P4492 | | RADIOEAR_P4492 | ||
| 10 | | 10 | ||
| 107 | | (107) | ||
| | | 127 | ||
| | | 20 | ||
| Y | | Y | ||
|- | |- | ||
| TELEPHONICS_TDH-39P | | TELEPHONICS_TDH-39P | ||
| 10 | | 10 | ||
| 108 | | (108) | ||
| | | 128 | ||
| | | 20 | ||
| Y | | 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)