Measurements: Mojo, AK100II, Sony ZX2, iPhone 6 Plus These are not comparable to the LH Labs GOV2 measurements. I did something a little bit different here because I wanted to evaluate performance for IEMs. I used 20.7 ohm load because these seemed like a good compromise for many types of IEMs which have nominal impedances ranging from 12 to 50 ohms. The voltage output I standardized on was about 45-50 mVrms for the distortion tests 1kHz and 50kHz. At this voltage level, the Andromeda IEM outputs about 100db more or less. Note that the plots say 4.5-5 mVrms. This is because I am using a differential probe with a 10 divider. The differential probe has a higher noise floor but tends to be a lot cleaner from artifacts and spurs of which there are many. I also couldn't be exact on the output because of the coarse volume controls on some of these portable units, especially the iPhone 6. But the levels are close enough to where the results should be comparable. Finally, for the last set of plots, I wanted to "crank" things up to see how much power these portables really had. The results were a bit surprising. It turns out the ZX2 with the "weaksauce power" of the S-Master myths might be false.