No. I don't know where the notion that the iPhone is a bad source came from but it's not. Output impedance is a bit of an issue on some models but plenty of players I'm not going to mention have worse output impedance issues and they're still revered. I'm not saying the iPhone is in the same league as players in the upper echelon but it's perfectly fine, even for higher end IEMs.
8/5/13 at 12:55pm