Originally Posted by vwinter
Even a 3-4 ohm output impedance is within the recommendations for a 32ohm headphone. The PX100II doesn't drop below 32ohms if measurements are to be believed. It even rises up in the 100hz region indicating that there is likely more control in that region. I suspect there is just bad synergy for your tastes in that specific case.
With the 32ohm ASG-2 I hear a tighter sound bottom to top fwiw.
It's not a PX-100 II. It's a PX-100. Do we have a impedance vs. frequency curve for that? Because, seriously, it sounds REALLY different, especially in the bass--just as a high output impedance amp / low impedance headphone combo is described as sounding. I searched for Z vs. Hz graphs of the PX-100's but didn't find any. If it's true that it, like its successor doesn't drop below 32 ohms, well, then I'm at a loss!
Originally Posted by GWagon
I found that my E12 had pretty bad EMI with my iPhone 5 strapped to it. I ended up moving to an IPC as I needed the extra space anyway and I preferred not having a brick attached to my phone.
Ah! Thanks so much for this information. What's an IPC?
So I've been A/B'ing my Grado SR-225's out of the 5S and Duet for the last 90 minutes, and well, there just isn't that big a difference, and I'm finding the music enjoyable out of the 5S. BUT, not quite as good as I'm used to my 225's sounding out of either source, BECAUSE I just sent them back to Grado not too long ago to fix a rattle problem (i.e. "Grattle") and they replaced the drivers. So the stupid things haven't been burned in yet. I never put much stock in burn-in one way or another, but if my audio memory can be trusted (I don't really trust it longer than 5-10 seconds or so) then these do not actually sound as good as my drivers with years and years of listening on them. And, in addition, maybe I'm wrong about having recovered from allergy issues, since I have to sit up to A/B, so maybe that's the difference. I think I need to take the good advice posted earlier. It's all good. I'll figure it out, one way or another.
But I surely would like to know if anyone else has tried the PX-100's (not 100 II's) with the 5S and what their take is. Because I can't imagine anyone liking the sound! I have two pairs of PX-100's. One which I've used for 2.5 years, and my reserve, like-new backup pair. Both pairs sound quite bad out of the 5S. And both pairs sounded great out of the 4. Or such is / was my subjective take (to state the obvious).