I'm getting the ATH-M50S' by Audio Technica, and I will be using it in conjunction with a FiiO Portable Headphone Amp (and either an L1 or L3 cable connector) and my iPhone 4. I was just wondering which amp to choose. (N.B. the impedance on the M50S' is about 32 ohms I think).
I can't seem to find the difference between the L1 or L3, because they look identical, so any information about those would help too.