Advertisement
Total Articles 5

08

2011-Aug

How we measure (Earphones, Headphones ...)

Nick Name: Golden Ears Registered Date: Aug 08, 2011, 04:15:28 IP ADRESS: *.56.123.5 Views: 137308

00.Thumbnail.jpg

 

 

 

01.Measuring.png
Normally, speakers are measured in an anechoic chamber with the microphone calibrated exactly a meter away from the tweeter.

 

But in the case of headphones and earphones, it is often impractical to have the measuring equipment in this configuration. This is because headphones and earphones seal the air around the ears when worn, which changes their sound significantly.

 

Because of this, headphones and earphones are measured using a dummy, such as the Ear Simulator or the Head and Torso Simulator, which emulate the environment in which they are used. The microphones here are located so as to mimic the human body as much as possible, situated where eardrums would be in a person.

 

Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

 

 

 

02.DF.png

However, once the microphones are out of the anechoic chamber and inside the simulated ear canal, there is another variable: the microphone registers different frequencies based on where it is within the ear. This is due to the resonance caused by the structure of the canal, and tends to occur around the 3 KHz mark.

 

The distortion, of course, requires compensation, and a correct calibration is essential for an accurate measurement. The graph below is the calibration used with the Bruel & Kjaer Head and Torso Simulator Type 4128C, the model currently used at Golden Ears. The calibration is obtained from the characteristic response in a Diffuse Sound Field, as headphones and earphones have a sound similar to that in this environment.

 

The calibration chart for Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

The calibration chart for Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

 

 

 

 

03.Room.png

The strict usage of the word ‘flat’, as applied to speakers, implies that the frequency response curve is flat in a testing environment - namely, the anechoic chamber. Then the question is: would ‘flat’ speakers still sound flat when used in a listening room, a theatre, or a recording studio?

 

There are several data that answer this question - the first graph, courtesy of Etymotic Research, shows the characteristic response of a recording studio with high-end equipment.

 

 

Loudspeaker Room-Equalized Response
Five Recommendations

Loudspeaker Room-Equalized Response

 

Notice that the ‘flat’ speakers actually represent progressively weaker responses in the studio as the frequency increases - this is similar to the X-Curve, the standard to which theatrical setups are tuned, and also to the Golden Ears office.

 

The Small Room X-Curve

 

As master recordings are created in a studio with this characteristic, further calibration must be done in order to make the response more accurately resemble what we perceive.

 

At Golden Ears, all frequency response graphs are calibrated with this in mind.

 

 

04.Hardware&Software.png

 

13.Hardware.png

 

14.Software.png

 

 

 

05.System_Configuration.png

 

11.System_Config_IN.png

 

 

12.System_Config_OUT.png

 

 

06.Pictures.png

 

Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

Bruel & Kjaer Type 4128C HATS (Head and Torso Simulator)

 

  GRAS IEC711 Coupler

GRAS IEC711 Coupler

 

 Bruel & Kjaer Artificial Ear Type 4152

Bruel & Kjaer Artificial Ear Type 4152 

 

 Bruel & Kjaer NEXUS Conditioning Amplifier

Bruel & Kjaer NEXUS Conditioning Amplifier

 

 Bruel & Kjaer Type 2669 Microphone pre-amplifier

Bruel & Kjaer Type 2669 Microphone pre-amplifier

 

 Earthworks M30 Measurement Microphone

Earthworks M30 Measurement Microphone

 

  GRAS Artificial Ear Type 43AC

GRAS Artificial Ear Type 43AC  

 Creative Commons License
Images, text and measured data by Golden Ears Corporation is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

 

Golden Ears Test System - for more information (Link)
1. HATS: Bruel & Kjær - Head and Torso Simulator Type 4128C
2. Microphone Amplifier: Bruel & Kjær - NEXUS Conditioning Amplifier 
3. Audio Interface: Lynx L22
4. DAC: Golden Ears D/A Converter
5. Headphone Amplifier: Golden Ears Headphone Amplifier 

How we test
1. Headphone / Earphone
2. Speaker
3. Amplifier / DAP
 

How to read G.E. Graph
1. Earphone / Headphone
2. Speaker (Directivity Pattern)
3. DAP / Amplifier

Tag
Attachment

Comment '175'

profile

www.office.com/setup

2018.10.21 03:32
*.235.155.16
I am having a look ahead in your subsequent submit, I will try to get the cling of it! You really make it appear really easy together with your presentation however I in finding this matter to be really one thing which I feel I might by no means understand. It kind of feels too complicated and very vast for me.

profile

ابادة حشرات بالمنزل

2018.11.07 06:33
*.217.21.9

للحفاظ على سلامة منازلكم تقوم ابادة حشرات المنزل بالتعقيم الشامل و العميق للمنازل باستخدام افضل وسائل ابادة الحشرات و يمكنكم التواصل مع خدمة عملاء ابادة الحشرات عن طريق الاتصال بالرقم اوقوموا بزيارة موقعنا .          

http://www.anti-insects.com

profile

seoman

2018.11.12 04:21
*.216.219.95

داخل مصروالقاهره شركة سوشيال ميديا فى مصر نوفر لكم خطط أسعار متعددة شركات سوشيال ميديا فى القاهرهتناسب ميزانيتكم الدعائية مهما كانت مع افضل شركة تصميم مواقع فى جده ونظراً لأن الأجهزة اللوحية والهواتف الذكية أصبحت منتشرة انتشار النار في الهشيم، افضل شركات تصميم المواقع فى مصر خبراء التسويق ، مع وجود تيم محترف لدينا متخصص فيشركات تصميم تطبيقات الجوال فى الرياض . بجانب التاريخ الحافل من النجاحات في حماية سمعة أعداد Web Design Company in Egypt لا يمكن حصرها من المؤسسات الحكومية والخاصة في مصر والسعودية شركة تسويق الكترونى فى السعوديه والإمارات والأردن ومختلف الدول العربية ادارة السمعه الالكترونيه ، لذا لا تبحثوا طويلاً وتواصلوا معنا نخن نتميز ايضا فى تتبع السمعه الالكترونيه. وربما قد يكون المحتوى جيد ولكن نظرة المستخدم افضل شركة تصميم مواقع فى القاهره لتصميم الموقع تعتبر العامل الاول والمؤثر كما تقدم اليكم شركتنا افضل شركة تصميم مواقع فى السعوديه خدمة التسويق الالكرتونى حيث انها افضل شركة تصميم مواقع فى مصر نحن بارعون كل مايخض مجالات البرمجه تسويق الكترونى فى الرياض تسويق الكترونى فى السعوديه نقدم كل ماهو مميز تصميم مواقع فى الرياض نحن اختيارك الاكثر تصميم مواقع فى السعوديه والافضل اينما كنت.

profile

shtaniya9

2018.11.12 20:59
*.74.100.70
profile

shtaniya9

2018.11.12 21:00
*.74.100.70

For optimized utilization of this technique, customers need to only set it up and set up. After settings of Adobe program customers can optimize it to develop their creativeness to the next level.

Aol Support Number

Aol Support Phone Number

Aol Tech Support Number

Aol Tech Support Phone Number

Aol Technical Support Number

Aol Technical Support Phone Number

Aol Customer Support Number

Aol Customer Support Phone Number

Aol Customer Service Number

Aol Customer Service Phone Number 

profile

shtaniya9

2018.11.12 21:19
*.74.100.70

The resetting of  laptop computer Viewpoint successfully removes the assigned IP for the product. The procedure for the  laptop computer or Viewpoint resetting varies depending on the design and elegance and design in.

Outlook Support Number

Outlook Support Phone Number

Outlook Tech Support Number

Outlook Tech Support Phone Number

Outlook Technical Support Number

Outlook Technical Support Phone Number

Outlook Customer Support Number

Outlook Customer Support Phone Number

Outlook Customer Service Number

Outlook Customer Service Phone Number 

profile

shtaniya9

2018.11.12 21:19
*.74.100.70

If you want to know technological issues happens with this technique and their remedy. On this website, you will find it. There are some common issues which almost experienced by Adobe customers.

Aol Support Number

Aol Support Phone Number

Aol Tech Support Number

Aol Tech Support Phone Number

Aol Technical Support Number

Aol Technical Support Phone Number

Aol Customer Support Number

Aol Customer Support Phone Number

Aol Customer Service Number

Aol Customer Service Phone Number

profile

sophietaylork

2018.11.13 01:42
*.131.188.187

Since the dawn of computer technology, human kind has been involved in the race to create the computer smarter, more human like. Search engines are the epitome of this technology,

http://www.appirox.com/


profile

شركة تنظيف بمكة

2018.11.13 05:37
*.46.196.227

عزيزنا العميل تقوم [url=https://www.el3nod.com/4/company-cleaning-apartments-home-villas-mecca]شركة تنظيف شقق بمكة[/url] بتنظيف الشقق على اعلى مستوى من النظافة و التطهير حيث تحرص [url=https://www.el3nod.com/4/company-cleaning-apartments-home-villas-mecca]شركة تنظيف بمكة[/url] على استخدام افضل وسائل التنظيف على مستوى العالم لتقديم افضل خدمة 


profile

شركة تنظيف بمكة

2018.11.13 05:40
*.46.196.227

الان تمتع معنا بافضل خدمة في شركة تنظيف شقق بمكة حيث افضل نتائج تنظيف الشقق و الفلل على اعلى مستوى من شركة تنظيف بمكة كما نقدمها لكم بافضل الاسعار على الاطلاق من اجل اسعادكم .

<style type="text/css"></style>https://www.el3nod.com/4/company-cleaning-apartments-home-villas-mecca

Maximum Attachments : 0Byte/ 10.00MB
Maximum File Size : 2.00MB (Allowed Extensions : *.*)

List of Articles
No. Subject Nick Name Date Views
  • Registered Date: Aug 09, 2011

40025

VIEWS

63

COMMENTED

  • Registered Date: Aug 08, 2011

93794

VIEWS

21

COMMENTED

  • Registered Date: Aug 08, 2011

67845

VIEWS

11

COMMENTED

  • Registered Date: Aug 08, 2011

137308

VIEWS

175

COMMENTED

  • Registered Date: Aug 08, 2011

64137

VIEWS

6

COMMENTED