Originally Posted by musicday
Thank you for that. Cowon S9 output independence is 2.17 ohm and iRiver AK 100 is 22.41, so that mean is i use my Westone 4R this won't sound good?
Higher output impedance generally means the frequency response will not be as intended by the manufacturer on lower impedance earphones, especially those with nonlinear impedance curves. It could change sig and become less balanced. Don't know about the s9 but the I9 shows bass roll off on low impedance devices even though it's output impedance is in the acceptable range. Likely uses too small of a DC blocking capacitor at the output so there's always more to it.
If the output impedance measurement is accurate on the AK100 (RMAA can be fooled), I'm pretty disappointed in the result. It may be acceptable in many cases but when you design leading edge and upmarket product, why make this big of a compromise. It would be easy to design in a lower output impedance. If true, this is a major oversight and disconnect in the planning or design phase. I had high hopes for this one and now my interest if waning.
Edited by goodvibes - 10/11/12 at 5:42am