Headphone Heights

impedance and sensitivity

68.114.112.109

Joe Murphy Jr

In Reply to: RE: Question from a "manufacturer" posted by anders.sf@online.no on November 19, 2012 at 17:14:12

For most iDevices and MP3 player type devices, it's best to stay around 32 Ohms and keep the sensitivity in the 100 dB area. You don't want the devices having problems driving your headphones nor do you want them running out of steam when the user tries to get decent volume in an outside environment.

Follow Ups:

RE: impedance and sensitivity - anders.sf@online.no 02:54:28 11/20/12 (6)
Thank you very much! Is sensitivity the same as rated or max. power?
- no - Joe Murphy Jr 08:58:23 11/20/12 (5)
  Maximum input is the maximum electrical input, usually expressed in mW for headphones, that you can safely push through the headphones.
  
  Sensitivity, usually expressed as dB/mW for headphones, is the volume you get out of the headphone's driver for a certain amount of electrical input. All else being equal, if you were to compare two different headphones by sending them the same signal at the same volume from an amp, the headphone with the higher sensitivity would appear to play louder (ie, more volume per the same input).
  - RE: no - anders.sf@online.no 10:46:47 11/20/12 (4)
    I see.
    
    Well, the specs I need to provide the manufacturers with are impedance (got a suggestion there from an other user) and rated power/max. power.
    
    Anyone got a suggestion for what max. power would be most suitable for my speakers?
    - RE: no - Benoit 06:19:00 11/21/12 (3)
      Although I approve the entrepreneurship, if you dont understand these very basic parameters, you have the risk that your product will ultimately be of very bad quality if at all usable. It depends how you target your product of course.
      I like the creativity though :-)
      - RE: no - anders.sf@online.no 15:29:30 11/21/12 (2)
        
        In Reply to: RE: no posted by Benoit on November 21, 2012 at 06:19:00
        
        Very valid concern indeed! But I'm going to give it my best and see what I can come up with.
        
        RE: no - Benoit 05:36:36 11/22/12 (1)
        
        In Reply to: RE: no posted by anders.sf@online.no on November 21, 2012 at 15:29:30
        
        You would focus on 32 ohms impedance, sensitivity 110DB/V, 250mW max power. But 20% deviation from there would be totally acceptable, it is the sound that matters.
        You may choose on-ear or over-ear speaker placement.
        And open or closed design.
        I think that comfort is most important, maybe beyond ultimate sound quality, and comfort will be a challenge with your design.
        You may want to adapt a ready-made solution (speaker set), if your chinese supplier has some experience in this field.
        Good luck
        
        RE: no - anders.sf@online.no 06:45:58 11/22/12 (0)
        
        In Reply to: RE: no posted by Benoit on November 22, 2012 at 05:36:36
        
        A very detailed, informative and helpful reply. Thank you very much!

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