So, just over half a year of wondering on this thread and
getting my first better headphones and DAC/AMP, I decided to get a separate on the road setup.
As a background, I love the Fostex TH-600s I got early this year. Their clarity, their soundscape, their deep and heavy bass. These qualities make them a wonderful headset for someone grown up listening to Genelec monitors. The TH-600s are really big however, and the portable Slappa case for them takes up half of my carry-on luggage allowance. Furthermore, their cable is super long, thick and heavy. But they are a great headset for home use.
The bigger disappointment, however, was my first choice of DAC/AMP, the Fiio E17. It just didn't seem to add anything to the mix. It only had a 3.5mm audio connector, and the impact on sound quality was minimal, in my opinion. So I got an entry level
Schiit stack and decided to dedicate the Fostex TH-600s to my design studio iMac - I'd listen to them when I work. There they benefit of the desktop amp, and the heavy cable or bulky size wouldn't bother me. So with my Fostex TH-600s and the entry Schist stack reserved to studio use, I needed a new travel kit.
After a lot of research and help in this thread, I decided to go for the new Oppo HA-2 DAC/AMP and Oppo PM-3 headphones. One day in, I am pretty impressed.
Oppo PM-3: The clarity of the Oppo PM-3 is very pleasing, it reproduces a very detailed overall image. The sense of space is clearly much smaller than in the TH-600s, as is the bass. There is much less boom. The sound is close, but clear and bright -
close like Audezes but less warm. The size and build of the headset are perfect for travel use. They are easy to pack for travel, the cable is small and slim, and I don't look like a twat with them on. Also while the TH-600s leak like a mofo, the PM-3a are whisper quiet, better for airplane use.
Generally, the Oppo PM-3s feel like a closer, toned down version of the TH-600s. I wish there would be a highly portable closed back, non-leaky headset with a wider soundscape, but for now, this is probably the best I can hope for on-the-road use.
Oppo HA-2: For me, this DAC/AMP is spectacular. It's what I hoped a portable DAC/AMP would actually be. Listening to an iPhone 6 Plus with and without them is like a night and day. The clarity I can draw out of the iPhone lighting port is incredible, compared to the 3.5mm analog port and iPhone's own DAC. And the direct connection without the hassle of a Camera Kit makes it perfect for travel use. The device adds a ton more in terms of depth, punch and sharpness compared to the Fiio E17, which I was disappointed with. The build quality is absolutely spectacular, and the device comes will every cable I could hope for. Really happy overall, they add a ton of value whether I use it with my Fostex TH-600s or the Oppo PM-3s.
What I listened to
As sources, I use highest quality Spotify or Apple Music tracks downloaded to device.
In terms of music selection, the track I tend to use to test sound stage is
Coldplay's 'Magic' (Live At The Enmore Theatre, Sydney). The different yells from the audience, and the location of the band give quickly a good feel of the overall image.
For bass, I use Royksopp's
'Skulls', it has a really heavy bass from 0:40 onwards.
For clarity, I use
Paco de Lucias Entre Dos Aquas. The guitar strings and the his are a good way for me to test the separation.
For complexity and separation, I use
U2s The Miracle (of Joey Ramone), its a very dense track with a lot of overlapping instruments.
For female voice, I use Dido's
'White Flag', it has really nice details in breaths and lip sounds.