I tried posting this in OT, and got one good response (thanks, Almighty Bass) that tended to side with me, but I'm being told by a self-described expert that I'm wrong about this, and I could use some expert opinion here. Amp mods hopefully will allow this here since I tried it first in OT... Anyway, I recently bought an iPod MP3 player, and also some audiophile earphones (Etymotic ER-4P) that are specially designed with a lower impedance than the company's other phones, so as to maximize the potential of small, portable players as opposed to home hi-fi. Anyway, I noticed immediately that my iPod's battery seemed to drain much more quickly using the low impedance phones, as compared to the "stock" phones. Common sense tells me that since my bass rig puts out more watts at lower impedance, and seems to convert more electricity to heat, that it must be drawing more power... and therefore it is reasonable to hypothesize that a lower impedance "speaker" load will drain my iPod's battery more quickly. So, am I right or wrong? My "adversary" tells me that the iPod puts out a fixed amount of power and that quicker battery drain must be a coincidence attributable to other factors. Technical explanations one way or the other would be appreciated! Thanks!