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hd25-1 ii impedance: 70 or 65 ohms?

post #1 of 8
8/27/08 at 5:28am
Thread Starter 
Some pages list the impedance of hd25-1 ii as 70 ohms, others as 65 ohms. The photos show hd25-1 with "70 ohms" written on them. The sennheiser webpage says it's 65 ohms.
The headroom graph shows the impedance is above 80 ohms for HD-25

So what is the real impedance of HD25-1 ii and why some claim a different one?
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post #2 of 8
8/27/08 at 6:24am
Sennheiser Electronic - HD 25-1 II nominal is 70 ohm, but there is available 600 ohm for professional use.
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post #3 of 8
8/27/08 at 7:56am
Yeh, when I multi-metered mine it gave me 65ohm, but I have no idea what that really means.
Sennheiser says it's 70ohm @ 1Khz, so it has some wiggle room I guess.
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post #4 of 8
8/30/08 at 5:45am
Thread Starter 

multi meter

Quote:
Originally Posted by Bonthouse View Post
I multi-metered mine
what exactly did you measure? DC resistance or AC impedance - at what frequency?
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post #5 of 8
8/30/08 at 8:51am
does it really matter it's 65 or 70 ohms? I'd have thought there wouldn't be too much difference.
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post #6 of 8
8/30/08 at 12:44pm
Quote:
Originally Posted by toanaldino View Post
does it really matter it's 65 or 70 ohms? I'd have thought there wouldn't be too much difference.
There are people who claim that they hear differences between copper and silver where the resistance-difference ist only 1.1*10^-9 ohm.

So I guess, yeah, it must make a huuuge difference


(just to be sure, that's sarcasm)
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post #7 of 8
8/30/08 at 3:08pm
Thread Starter 

does it matter?

Quote:
Originally Posted by toanaldino View Post
does it really matter it's 65 or 70 ohms?
It really doesn't matter to me and for me there's no difference, I was just puzzled by websites/e-shops (including sennheiser themselves too) claiming 65 ohms in their specs and at the same time having hi-rez photos of HD25-1 with "70 ohms" clearly visible on them. So which one is correct and how did the other number originate and why do they use it?
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post #8 of 8
2/15/13 at 2:17pm

I changed my hd 25 1-ii with hd 25sp copper cable which has 600ohm...
Does that makes my hp 600ohm??

I m just a newbie.

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Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › hd25-1 ii impedance: 70 or 65 ohms?