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What's the difference of versions of Sennheiser Headphones HD-25?

HD-25 BE (Basic Edition) HD-25 Sky HD-25-1 HD-25-1 II HD-25 SP HD-25 SP II HD-25 C II HD-25-13 HD-25-13 II

I allready ask to sennheiser team, i'm waiting for their answers. Soon i receive i'll post here. Meantime I'm hoping you can tell me by your experience or your personal knowledge..

(My interest is for field-recording and studio needs)

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Says it in this PDF on Sennheiser's website:

HD25

  • impedance:

    • 70 Ω (HD 25-1 II)
    • 70 Ω (HD 25-C II)
    • 600 Ω (HD 25-13 II)
    • 70 Ω (HD 25-II)
  • cable length

    • HD 25-1 II: 1,5 m
    • HD 25-C II: 3 m (1 m)
    • HD 25-13 II: 3 m
    • HD 25-II: 2 m
  • SPL: 120 dB

  • Frequency response: 16 – 22,000 Hz (- 3 dB)

HD25 SP

  • impedance: 60 Ω
  • SPL: 100 dB ± 2 dB
  • Frequency response: 30 – 16,000 Hz (- 3 dB)
  • thanks @georgi.m ,but the diference in all this versions is just impedance and one have extra diferences? thanks for your atencion but, there isnt any more diference like bigger earpads.. HD-25-1, HD 25-C II and HD 25-II have the same impedance, they are diferent versions only becouse their cable? Isn't weird? – ORB Feb 4 '11 at 1:12
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    hey :) they're basically all hd25-s. if they had any other differences except for cable, setup, colour (!), it would have been in the spec.. i think the most important is: hd25sp is not hd25. – georgi Feb 4 '11 at 16:13
  • Just re-asking the question as the PDF link is no longer working. Could someone explain what the difference in impedence causes to the sound quality? I recently bought the basic 25-1 and am I correct in thinking the only real difference with the full version is cable length and quality? – kinnth Jan 24 '16 at 22:55
  • Impedance should match the impedance of whatever you are driving it with. – user18481 Jun 8 '16 at 19:17

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