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Headphone & Amp Impedance Questions? Find the answers here!

Discussion in 'Sound Science' started by proton007, Apr 25, 2012.
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  1. obobskivich
    Just ensure that you don't push the signal/amp/etc into clipping by applying too much boost to a given band. If that makes sense.
    JohnSantana likes this.
  2. proton007
    Push the master down if thats the case.
  3. JohnSantana
    master volume from the source ?
    eg. the Windows Media player volume or the source device ?
  4. chewy4
    I believe he's talking about the master on the equalizer.
    Like if you get clipping, bump down all the bands. Ideally you want the highest band at 0db gain.
    EDIT: Although I'm guessing that's not possible with the preset button on the Fiio's.
  5. JohnSantana
    Yes you are right Chewy,
    in my Fiio E11 I cannot see any option to bump it down ? apart from volume knob and the 0 1 2 equalizer preset switch and gain switch.
  6. chewy4
    Isn't the Fiio EQ just a bass boost?
    Either way it's designed to not go to clipping levels I would think, so I don't think you would have to worry about it there. You would just have to keep the bands on your software EQ lower if there is clipping.
  7. polat ozturk
            Hi All..
      Guys can you help me here.. ı bought a
    Pioneer hdj 2000 headphone
    1. Lightweight magnesium design
    2. Protein leather surface with memory foam padding
    3. Removable Mini XLR connector
    4. 'i-hinge' design with 90° auto return
    5. Type: Fully enclosed dynamic headphones
    6. Frequency response: 5 Hz to 30,000 Hz
    7. Impedance: 36 Ω
    8. Sensitivity: 107 dB
    9. Maximum power input: 3,500 mW
    10. Driver units: 50 mm dome type
    11. Cord: 1.2-m-long one-side connection coiled type (extended length 3 m)
    12. Plug: 3.5 mm 3P mini-plug (gold-plated, threaded type)
    13. Weight: 290 g (without cord)
    14. Accessories: Carrying pouch, 6.3 mm 3P plug adaptor (gold-plated, threaded type)
     my problem is it sound like 10$ headphono when ı use my desctops onboar soundcard realtech output..Well ım now looking for an dac/amp for my headphone.Yesterday ı found Fiio e10 and ım thinking to buy it.But before that ı just want to be sure if it can fully drive my headphones cans.Iwill write dawn the specs of fiio e10
    fiio e10
    ● Power supply: Standard MINI USB port
    ● Output Power: 150mW(32Ω)
    ● Sample rate USB decoder: 96KHz/24 Bit (Maximum support)
    ● Coaxial output: Stereo PCM
    ● Frequency response: 20Hz~20KHz
    ● Suitable Headphone Impedance: 16Ω~300Ω
    ● Size: 79mm×49.1mm×21mm
    ● Weight: 82g

       So.. ı will ask this directly... Will ı be able to listen insanely high volumes without distortion with this fiio e10 dac/amp or not.... if not what would be your adviceses....
                Thank you all from now........
  8. stv014
  9. Ruben123
    Am I that deaf that I do not hear too huge differences between my Sansa Clip + (near zero Ohm) and the Behringer soundcard (50 Ohm) with a Sennheiser HD 205 II (32 Ohm)? 
  10. xnor
    The impedance of the HD205 II seems to be pretty flat so there should only be small frequency response differences.
    obobskivich likes this.
  11. stv014
    The "EQ" on the FiiO E11 is an analog bass boost. If implemented properly, it should not clip unless you set the volume too high.
  12. Ruben123
    Hi xnor, thank you for your response!
    It may explain a lot. Could you tell me how I could find out how flat the impedance is of any headphone? I also own some other headphones and I would like to know if I can use them too with higher impedance sources.
  13. stv014
    Check the impedance vs. frequency graphs at innerfidelity.com, headphone.com, doctorhead.ru, or goldenears.net. Interestingly, there are some inconsistencies between their measurements, perhaps not all of them measured the impedance while the headphone is on a dummy head (it does makes a difference).
    You could also test it yourself, having a source of known high output impedance (or simply whatever you intend to drive the headphones with, to verify that there are no significant frequency response or distortion problems), a splitter, and a PC sound card.
  14. MrMateoHead
    Can anyone help me decode these specifications:

    Headphone output @32 Ohms is given as 1Vrms. Analog power supply current is given as 51 mA. So, my guess is that 1*51 = 51 mW of available power @ 32 Ohms. Output impedance is 1 Ohm. @ 64 Ohms, output should be something like 26 mWs (assuming no additional voltage is compensating for impedance change). At 50 Ohms, which is my actual rated headphone impedance, the estimate would be about 29 mWs. 
    I am getting new phones that are rated 35 Ohms, but have appeared to test at 50 Ohms. They are rated 93.4 Db, but unknown if @ 1 mW or 1 Volt RMS (current headset). To reach 110 Db, I would need 16.6 times the power, or, 16.6 mW.
    I am finding that manufacturers really don't rate gear consistently. I have been trying to determine what my existing available wattage is, so I can make a better decision about how much I might need later from an amp upgrade.
    The Schiit Asgard, for example, has THD + Noise of .1% @ 1 Vrms, but is rated to supply up to 20 Vs between loads of 8-600 Ohms. It is a known 1-watt or so amp, yet I can't figure this out based on their published specs.
  15. stv014
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