Search This Blog

Friday, August 17, 2012

The effect of acoustic dampers on IEMs


I thank Knowles electronics for the support.
On most of balanced-armature transducer driven IEMs available in the market, there is a tiny screen implemented at the opening of the acoustic output port. This is an acoustic damper, and it serves two purposes:


  1. The filter blocks off external materials from getting into the transducer, thus preventing damages to occur deriving from such causes.
  2. The filter has an unique resistive value, and acts as a passive acoustic filter mainly reducing the first peak resulted by the mechanical resonance at f0. 
"The bump at 2 kHz is primarily caused by the mechanical resonance of the receiver: the mass of the diaphragm and springiness, or compliance, of the diaphragm combined wit the compliance of the air inside the receiver." H. Dillon, Hearing Aids, Boomerang Press, Turramurra, Australia, 2001. 
Their rated performances have been demonstrated by one of the manufacturers, but there has not been a single instance of which an actual IEM has been utilized. So Etymotic Research ER-4B is used to find out how the filters help shape the frequency response of an IEM.


With stock acoustic dampers:

With conventional acoustic dampers:
The first two peaks are definitely being controlled, and especially when the acoustic resistance reaches 2.2k ohm.  After this experiment, I changed the stock green filters (1.5 k ohms) on my ER-4B to orange ones, which are 3.3 k ohms. It's only flatter, with increased high-frequency bandwidth!

And here is the conclusive analysis of the experiment with ER-4, relative level differences plotted all at the same time. Click the graph, and it will get bigger.

Since the damper can turn ER-4B into ER-4S with broader frequency bandwidth, maybe vice versa, or even evolving ER-4P into other two might be possible without using an electrical filter. And that will be the topic of my next article, it seems!

79 comments:

  1. ... 필터 구매하고 교체하시느라 번거로우셨을 것 같슴닼ㅋㅋ 한번 빼면 재활용 불가일텐데 orz

    그나저나 언제 한번 알텍랜싱이랑 JBL/하만카든에 OEM으로 제공했던 ER-7(iM616/716, EP720/730)용 필터를 ER-4/HF 용 필터와 비교해봐야 할텐데...
    (ER-7용은 빨간색, 연두색이고 ER-4/HF용은 녹색임다. 색이 좀 다르죠.)

    ReplyDelete
    Replies
    1. 616/716필터는 빨강이같아보이는데ㅎㅎ

      Delete
  2. Damn... Impact Felt... It feels so GOOD!!!

    I love this blog!

    Thank you Rin for what you are/have done!

    Jim

    ReplyDelete
  3. Rin,
    May I ask what kind of luck you had in swapping out the dampers without destroying them.
    I would also like to know where all of the various dampers could be purchased.
    Thanks, Jim
    PS If needed, my email is the same as my PayPal acct.

    ReplyDelete
  4. Found em...

    Mouser.com

    Perdy Cheap Too.

    Jim

    ReplyDelete
  5. Hey All,
    While I wait for my damper order. I rolled some greenies into my MC5s.
    Prepare for Impact was RIGHT... They have turned into Bass Monsters.
    Thanks again Rin.
    Jim

    ReplyDelete
  6. While these dampers may look complicated, they are easy to use and install. Manufacturers offer an installation guide for the specific type and model that you purchase, allowing you to easily use and install the device on your own.

    ReplyDelete
  7. What about interchangeable tuning filters such as the ones that come with the RHA earbuds? How do they work?

    ReplyDelete
  8. This comment has been removed by the author.

    ReplyDelete
  9. Abels staff are professional cleaners who are trained and accredited to Australian Standard and carry full liability insurance. Our fleet of carpet cleaning vehicles with truck mounted and portable cleaning equipment and our general cleaning service vehicles are ready to visit you and provide you with the very best in cleaning, hygiene and sanitation.commercial cleaning hobart
    carpet cleaner hobart
    carpet cleaning hobart

    ReplyDelete
  10. Nice Blog, Thanks for sharing helpful information.

    HOBART SEO is one of the leading SEO and digital marketing specialists in Hobart. With years of experience under our belt and a creative team of individuals that possess outstanding design and technical knowledge, we’re more than confident that our team can assist you in establishing and growing a digital presence.

    Hobart SEO
    SEO Hobart
    Digital marketing

    ReplyDelete
  11. Get the best Bangalore Escorts & sexy call girls at Deepika Rai, the best escorts service provider in Bangalore, contact us to get erotic massage service, sex service. Get your dream girl today.
    Escorts Service in Bangalore
    Bangalore escorts services
    Bangalore Escorts
    Bangalore Escorts
    Bangalore Escorts
    Bangalore Escorts
    Bangalore Escorts
    Independent Bangalore Escorts
    Bangalore Escorts Services

    ReplyDelete
  12. if you are also looking to spend your quality time with the escort girls for the full night will just call us and book any of the Chennai Escorts hot beauty and gets the complete entertainment without any of the issues. Visit More: Chennai escorts service

    ReplyDelete
  13. Do you need an urgent loan of any kind? Loans to liquidate debts or need to loan to improve your business have you been rejected by any other banks and financial institutions? Do you need a loan or a mortgage? This is the place to look, we are here to solve all your financial problems. We borrow money for the public. Need financial help with a bad credit in need of money. To pay for a commercial investment at a reasonable rate of 3%, let me use this method to inform you that we are providing reliable and helpful assistance and we will be ready to lend you. Contact us today by email: daveloganloanfirm@gmail.com Call/Text: +1(501)800-0690 And whatsapp: +1 (315) 640-3560

    NEED A LOAN?
    Ask Me.

    ReplyDelete
  14. Get Unlimited Unique Pleasant with Mahipalpur Escorts Girls in a 5-star hotel at an affordable price, Visit Here 👉👉 Mahipalpur Escorts| Mahipalpur Escort Service | Delhi Escorts

    ReplyDelete
  15. We have a gallery of some of the hottest, most adventurous girls that you will ever meet. Are you looking for a romantic night out in the town? A quiet night in where you can make all of your dreams come true? We have the girl for you.
    Indore Escorts
    Indore Escorts
    Indore Call Girls

    ReplyDelete
  16. Call Girl in Manali

    Whether you search sex outside of a relationship or want a sexy casual sexual to get fun, sexy Manali call girls are able to make your journey unforgettable.


    ReplyDelete

  17. 3d Product Modeling | 3d Product Modeling Company In India
    We at Quick gunz Pvt Ltd who deliver 3d Product modeling Services worldwide from previous couple of Decades within the market with top quality 3D product Modeling & render for our clients. We offer our greatest 3d product Modeling for Interior & exterior, 3D Architectural, Photorealistic, Industrial, 3D Medical, 3D Manufacturer offered to the highest companies across the world .

    3D Product Modeling Company
    3D Product Modeling

    ReplyDelete
  18. Jaipur Escort Service: We provide Jaipur sexy call girls, college girls for VIP clients. Call us for celebrity escorts in Jaipur 5 star hotels.

    ReplyDelete
  19. Do you want to get a full exotic service? Mumbai Escorts Hub here at your service. You can meet with our call girls to make your time memorable full of enjoyment. We offer all types of sex with great satisfaction. Our Independent call Girl gives real massage along with full service of deep throat, cim, cum, anal and much more basically you think our ladies and would love to serve you without rushing. It's our passion and choice to be an escort that's why our call girls love to satisfy our clients for recommendation and referral.

    Mumbai Escorts Services:
    Mumbai Escorts | Mumbai Escorts Service |

    Mumbai Sex Aunty Number | Phone Sex Mumbai | Mumbai Call Girl Whatsapp Number | Mumbai Call Girls Near Me |

    ReplyDelete

  20. Shashkay online glasses store which provides fashion sunglasses and decent optics to the customers. Shashkay is a trustworthy website which has a huge audience to buy glasses online. Shashkay stock consists of men, women and kids eyewear. Categories of Shashkay have metal eye wear in different sizes.

    ReplyDelete
  21. Advantages Of Blockchain In Nutshell
    There are many advantages of Blockchain not only in the crypto sector but to all sectors. Organizations can utilize multiple levels of accessibility using enterprise blockchain technology. With the help of Blockchain, it is possible to make faster transactions and automate account reconciliation. Transactions are also easy to track because of the transparency in the Blockchain.

    ReplyDelete
  22. Chandigarh call girls are the leading escort agency having expert call girls to meet high expectations of intimate performance. Our call girls are the real stress buster and will give you extreme satisfaction.

    Chandigarh Escorts
    Mohali Escorts
    Zirakpur Escorts
    Panchkula Escorts
    Amritsar Escorts
    Dehradun Escorts

    ReplyDelete
  23. Hi, you are welcome to my internet site and I thank you individually for touring my web page and giving this unbiased escort in Delhi the probability to serve your all desires. You comprehend Delhi is the most extraordinary area to go to and when you are in a corporation of escorts in Delhi then it is even extra beautiful, earlier than announcing whatever let me make a promise to you that all the Independent Escorts in my crew are hundred percentage genuine.
    https://www.russianescortservicesdelhi.com/
    https://sapnaoberoi.com/

    ReplyDelete
  24. Anyone know where we can reach out to Rin Choi to consult on acoustic dampers?

    ReplyDelete

  25. Thanks for sharing this brilliant article it was a very useful and helpful article.

    weblink
    news
    Get More Info
    click site
    Visit My Site
    female escorts bangalore

    ReplyDelete
  26. Thank you so much for sharing the informative post, I appreciate your work. Go so many useful and informative links. Loved your writings also.
    Best Makeup Artist Dwarka
    Best Makeup Artist

    ReplyDelete
  27. You can always be in advantageous position being linked to all of these horniest darlings here.
    NewsNation Chandigarh escorts
    TVB iNews escort service Chandigarh

    ReplyDelete
  28. Hot Vip call girls in Ambala In any of the particular locations you wish to be linked to the well developed babes here with us, they are mostly adjustable to any environment.

    High profile Ambala Escort Service
    VIP high profile Ambala Escorts
    High Profile Ambala call girls

    ReplyDelete
  29. The Escorts in City can remain engaged to anyone owing to their skills and commitments all around.
    Chandigarh escort Brigada News TV
    escort service in Chandigarh ARY News

    ReplyDelete
  30. The clients are seriously going to select the options from our escort agency leaving the others in the entire list.
    Apna News Chandigarh escorts service
    ABP News Chandigarh escorts service

    ReplyDelete
  31. VIP Model Independent call girls in Mussoorie are therefore selected to be involved in the session of love giving their clients some incredible minutes of erotic romance.
    VIP Independent mussoorie Escorts
    mussoorie Call Girls
    High Profile Call Girls in Mussoorie

    ReplyDelete
  32. Amritsar Escort service have all sorts of skills in meeting the desires of men whenever they require. It is fine characteristics of these ravishing hot babes which is going to call out clients from all parts of this world.
    Follow us:-

    Hi Profile Call Girls in Amritsar
    Amritsar Escorts Service
    Amritsar Escorts
    Amritsar Call Girls
    Russian Escorts Service in Amritsar

    ReplyDelete
  33. Appoint Call Girls in Jammu to different programs .Whether the kind of occasion is an official meeting, corporate event or some other special program, the divas here do have patience to handle all customers.Follow us:-
    Follow us:-

    Jammu Escorts Service
    Jammu Escorts
    Jammu Escorts Service
    Jammu Escorts
    Jammu Escorts Service

    ReplyDelete
  34. Zirakpur call girls are suppose to perform well being linked with their clients owing to their wide range of experience and knowledge.
    Follow Us:-

    Zirakpur Escorts
    Zirakpur Escorts Service
    Zirakpur Escorts
    Zirakpur Escorts
    Zirakpur Escorts Agency
    Zirakpur Escorts
    Zirakpur Escorts

    ReplyDelete
  35. This comment has been removed by the author.

    ReplyDelete
  36. Thank you for the wonderful post you have shared here, I'm glad to see such a nice resource.
    Checkout this as well:- letterhead printing

    ReplyDelete
  37. Sindh Wood Works Enterprise is an interior design firm with experience in architectural design, interior design as well as construction. The company is located in Karachi but we are able to execute the design anywhere in Pakistan. We provide a variety of solutions for interior design, architecture, and construction. Contact us for more information or assistance.

    ReplyDelete
  38. Salesforce Development
    In addition to the below benefits, Salesforce development enhances collaboration, improves internal communication, and prepares associations for unborn challenges. And that’s why Sales force’s development increases the chances of success in a busy, noisy business terrain.

    ReplyDelete
  39. We are Delhi based SMO Company, We offer Social Media Optimization (SMO) Services in Delhi, India at reasonable price
    Emotions Interior Designer is the most textured interior design. their company provide a unique and creative approach to their customers.
    buy money plant online at best prices only at Birthright, India's leading online shop for agriculture supplies and garden tools.
    Financeatyourtip, provide updates about the best demat account for traders all over world. Its brokerage fee is extremely feasible and this assists traders and investors
    F95zone Latest Games & Updates. A visual overview of the latest new games and updates.buy indoor plants online at best prices only at Birthright, India's leading online shop.

    ReplyDelete

  40. At Dallas Cell Phone Repair ,We lead the industry in cell phone repair and computer replacements. No other team has a more rigorous training and certification process, and our team is able to fix electronic issues.

    Samsung Mobile Repair in Dallas TX, Guaranteed! Call (214)-929-7246 & Schedule your Samsung Galaxy Repair Today!

    Need to iPad Repair in Dallas?Make an appointment at an Dallas Cell Phone Repair Store. Find out how much it will cost and how long it will take.

    ReplyDelete
  41. This comment has been removed by the author.

    ReplyDelete
  42. Sometimes it becomes difficult for the companies to choose the right shot blasting machine
    for their blasting purpose. In order to pick the right model of a Shot blasting machine
    you need to consider the method of transportation of the components to be blasted that
    will define the type of the machine you require.

    ReplyDelete
  43. Aluminum silicate (Al2SiO5) is moreover alluded to as kaolin, or hydrated aluminum silicate when in powder form. Aluminum silicate is a mixture of alumina, silica, and oxygen. Kaolin is often used as a demulcent and adsorbent in the pharmaceutical industry. It is used in color lakes (insoluble dyes).

    ReplyDelete
  44. Fantasy Ludo
    is one of the best apps to play and win money. When you download the app Ludo Plaza, you will get a ₹10 instant bonus prize which you can use to play the game. When you share your referral code with friends, you can get ₹15 on every download.

    ReplyDelete
  45. A sandblasting machine is used to remove paint, rust, and residuals from oxidation. This process can also change the surface of a metal. This method saves time and money, and the best sand blasting companies in UAE use the best machines. So, if you're looking to buy a Sand Blasting Machine in UAE, make sure to do your research before making a decision.
    If you're looking to buy a Sand Blasting Machine in UAE, it will be a good idea to select a company that specializes in this type of work. This will ensure that you get the best results, and you can save a lot of time and money. There are also sand blasting machines in UAE that can be used for glass carving. These machines are very effective and can be used for all types of projects.

    sandblasting machine in india

    ReplyDelete
  46. A shot blasting machine is a type of equipment used to
    prepare surfaces for coatings, painting, and other
    processes. These machines contain a chamber for the
    shooting of grits and shots. The bare wheel rotates
    continuously to create the abrasive material. The abrasive
    medium has a high rate of impact that causes wear and tear
    on the chamber and other parts. Maan Global Industries, a
    shot blasting machine manufacturer in India, provides
    automatic and manual shot blasting machines made of
    quality steel, robust design, and excellent service support.

    ReplyDelete
  47. Ludo Money may be played by up to four players in two modes — Terminator and Team Battle – which boosts the excitement over basic Ludo. The intriguing features include several twists and turns that truly distinguish Ludo All-Star as thegreatest free Ludo game in 2020.

    ReplyDelete
  48. Whether you are a huge fan of Hollywood or love watching old Bollywood, Movierulz India is undoubtedly the finest website to download high-quality content at the earliest. Unlike the most popular torrent site “The Pirates of the Bay”, Movierulz introduces amazing features making it the best Extra Torrent Site online.

    ReplyDelete
  49. Web Security Audit is the combination of Penetration Testing and Code Review Methodology. It is a process of evaluating the security of a Web system by simulating attacks and reviewing the code of the web application, the process involves an active analysis of the application for any technical flaws or vulnerabilities.

    ReplyDelete
  50. Hii my name is Jimmy Andrew I am from the technical team if you are facing a problem with Roku error 014.50
    then you can visit our site Real science here you can find every solution related to the Shayari .

    ReplyDelete
  51. We have about numerous fresh introductions for obtaining happy in as well as to supply enjoyment to the clients. Ashika Soni

    ReplyDelete
  52. Mumbai Companion is the perfect place to spend your next vacation or weekend trip, but sometimes you need something to spice things up, right? Whether you’re traveling for business or pleasure, hiring an girl from our service will connect you with one of the most beautiful and fun girls in the city

    ReplyDelete
  53. If you remain in Bangalore for an enchanting weekend or just wish to make your trip as unforgettable as possible, you'll absolutely wish to employ an Bangalore Models spa.

    ReplyDelete
  54. Our Mumbai Companion services is the most ideal approach to make your evenings awesome at the town.

    ReplyDelete
  55. This comment has been removed by the author.

    ReplyDelete
  56. Wow its nice to see your work and you can also check my Contents and blog

    ReplyDelete
  57. Hello, Thank you for sharing this beautiful blog.

    ReplyDelete
  58. It is crucial that when you are looking at any assistance, you outline that different affiliations will serve different districts. Take out a chance to check your district and find which affiliations will miss their ears to you. Visit here Mexican food nearby

    ReplyDelete
  59. Looking for high-quality trumpet lessons in Sydney? Look at Standout Music Studio! Our experienced instructors offer personalized classes for all skill levels.
    https://soundcloud.com/mollygreville316/

    ReplyDelete
  60. sandals for mens sale - Get huge discount upto 80% off on the latest collection of men sandals.

    ReplyDelete
  61. This is very nice information about the 3d product modeling services ,Thank you so much for sharing your knowledge. keep it up

    ReplyDelete
  62. Your writing has a unique ability to create a sense of connection. It's like having a meaningful conversation with a friend, even in the virtual world.

    Black Marble in Abu Dhabi

    ReplyDelete
  63. The physical contact of a body to body massage centre near me can trigger the release of endorphins which are natural mood boosters. This may result in feelings of happiness as well as a general feeling of happiness.

    ReplyDelete