Been listening to NW-A17 / PHA-3 (WM out to digital in) combination for the past couple of days. Enough Daft Punk and Bill Evans to last a lifetime...
Since the only cans I have with the PHA-3 balanced cable is Sony MDR-1A, until I get the cable extensions/new cables delivered from various sources, I will have to live with these for a while...
I actually tried my CIEMs (Noble K10 and JHPro 16s) as well as LCD-XCs through the SE output on PHA-3. PHA-3 is just a well-blanced amp overall. Depth/soundstage is there, and while it does not have the power of my CL Duet or the newly tweaked Analog Square Paper TR-06, the Sony amp has certainly enough juice to drive all my iems/cans properly and do so in what I would call in a "refined" manner. No particular weakness in terms of frequencies - strong mid presence, good but not-over-the-top treble (un-Sonylike) and meaty bass with impact - and noise floor is extremely low. I think a lot has to do with DAC on PHA-3, which is actually a pretty good DAC...I did a Fiio X5 / PHA-3 combo (Fiio LO to PHA-3 LI), which did not sound as good as NW-A17 / PHA-3, whereas as standalone players, I strongly prefer the Fiio over the Sony. With some other sources - AK players for example - I think I would still prefer Duet or even SR71B, but paired digitally with NW-A17, I can see myself putting PHA-3 in my backpack quite often, even without the proper balanced cables for my CIEMs.
I guess the crown jewel of PHA-3 is really the balanced output, so I listened to MDR-1A with a balanced cable (sold separately) for a few hours. I will have to say that the balanced output makes a HUGE difference. The overall improvement in soundstage / separation going from SE to balanced is just unbelievable. It just opened up the sound a whole lot, and separation - not just channel separation, but also instrument/vocal separation - was even more pronounced than with my other balanced amps such as Duet and SR71B. Now, I realize that this particular sound sig may not be for everyone - after all, there is a reason why some amps have crossfade features - but this is something that everyone should definitely try out. I happened to like it a lot, so I am definitely looking forward to getting my PHA-3 custom cables for my other cans and items... I think on some of the better recorded tracks (e.g. Daft Punk), I actually preferred going with MDR-1A balanced over Audeze XC or my CIEMs on SE connection... I think the power ratings are different between the SE and balanced outs, so that might have contributed to the huge difference as well.
Anyway, I think I have a bit more listening to do. When I get all my cables for the balanced output, I will try to report more.