Apologies for the dumb question, but what spec tells you the output power of the amp? I have a pair of JH Roxanne CIEMS, and I get the impression that my Fiio X7 doesn't have enough power to drive them with the AM1 amp module. (At least, when I connected a Fiio Mont-Blanc E12, things really seemed to open up...)
I see specs like "output power" listed in mW, Vrms, and then things like "output impedance", "output voltage", and "output current". Which should I look at to determine whether an amp has enough juice to power my IEMs/headphones?
Oh, and is there ever a downside to using an amp that's has more than enough power to drive the phones? I get the impression that since the AM1 module is advertised as being for IEMs that it should be able to power my JH Roxannes -- but is there a downside in buying the AM2 (or even the high-power AM5 module when it becomes available) and using that? Volume levels being held constant, would the highest power amp sound the best?
Thanks guys!