Etymotic earphones, impedance, distortion and all that jazz!
I was about to buy ER6i earphones for my iPod Photo, when I saw, on the Apple discussions, a claim that the iPhoto doesn't work well with low-impedance earphones, such as the ER6i. It produces distortion, especially on quiet classical pieces, it's alleged. This makes me think I'd be better with the high-impedance ER6 model. Is this right? Thank you.
This was the reply:
What you describe is only likely at high volume settings. For a given volume control setting, the 6i delivers 8 dB greater SPL, but is more likely to overload only at full volume. We don't know the output capability of the iPod Photo. If you listen to music at "normal classical concert loudness," either earphone is fine, but the ER-6 has a higher frequency response accuracy (due to less bass) than the 6i. You probably do not need the greater output sensitivity of the 6i, but it should not be a problem for you.
I'm impressed that my email was read, understood and answered quickly. Good for Etymotic. The answer seems reasonable to me, but then, what do I know? Any comments?
MacGee.