Hey the adaptor works in the one way, to make the 4P like the 4S, as you already owned the 4P, it makes no sense, it only raises the impendance but not decreases the impedance, you even need to lower the impedance a little bit, lower thna 32 ohms, and not to increase it, if you are going to hook it directly to the iPod, but if you are going to use the amp, is OK. The adpator I think is only a couple of resistors inside a cable or so, just to make the impedance looks higher when using the 4P... please, correct me if I'm wrong William you owned both and the adapter IIRC, right?