This is pretty interesting.
I accused the DF of having high output impedance (nothing as high as this, but suspected ~10ohms) because of how I perceived that to be overly warm... mostly due to the nature of the bass. Granted I don't know if I'd heard what high output impedance sounded like, it was just my assessment born from using a variety of < 50 ohm headphones and IEMS (all dynamic down to 16 ohms) on it vs. an ODAC/O2 combo, an E17, and my MBA headphone out, all noted to have < 2 ohm output. They all just sounded more like each other than they sounded like the DF. Gordon Rankin finally stepped in after I reported the results a head-fi member made on CA and corrected the method and claimed a sub 1 ohm on it. Then I chalked it up to improper burn-in, or perhaps a smoother sound due to the async implementation. It's all there in the DF thread, plenty of people were clamoring for measurements but I believe I was the first who thought he 'heard it'. Some people thought I was a bit crazy or my hearing is off, which I guess perhaps it is.
With the ME, I just didn't detect it and didn't even suspect it. Again this came from bouncing it against the headphone out in my MBA (which Voldemort measured and claim it was perhaps the best headphone out on a laptop he'd seen) the DF using a 16 ohm dynamic IEM. In this case I felt the frequency response has more in common with the MBA than the DF, that it's certainly leaner.
Yesterday I took delivery of a FitEar TG!334 and only tried it on the ME and MBA headphone out, my first multi-crossover BA IEM. To me they sounded quite similar in frequency response. I have yet to try the DF as I let a friend borrow it but I'll try to get it back today and see how it fares with the 334. Nothing really to add here besides this - I came into purchasing both the DF and ME with relatively high expectations based on reviews I'd read beforehand, and certainly had the expectation the ME was leaner based on those reviews. I do realize there were some comments here that claimed otherwise but that's not the way I hear it, then again I may have really succumed to expectation bias here in a pretty grand way. And I esp. thought Purrin wrote a satire piece.
The weirdest thing is Meridian publishes that 16 ohm spec for max output. It's almost perverse they would do that, as clearly this is not designed to drive something like that.
Edited by bobeau - 2/28/13 at 5:08am