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- Feb 23, 2011
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Hi miceblue,
the Vmoda is 32 ohms and that's most probably way too low for the macbook. The usual rule of thumb is that the headphone impedance should be 8-10 times or higher than the output impedance of the amp. That would mean the output should have 3-4 ohms or less and apple seems to state less than 24 ohms...
http://apple.stackexchange.com/questions/57186/what-is-the-impedance-of-the-line-headphone-jack-on-macbook-pro-retina
So the sound of the Vmoda is probably a bit colored when directly connected to the macbook and will sound different when when the macbook just drives the O2 with >10k ohms input impedance.
Joachim
Yeah that may very well be the case. Is there a way to measure the output impedance with things lying round the house? That stackexchange link didn't give a specific value. I'm inclined to think Apple updated their specs since the Retina Display line since there's a pretty substantial difference in sound between that and my 2008 MacBook.
The O2's output impedance is about 0.5 Ω according to the blog.
I cant even belive this is happening......OMG...
This is really well.....you know.....
Have fun....
A.
Thank you for the constructive feedback and explanations, I feel edified now.