Let me first say I am not a huge fan of headphones because I dislike the in your head soundstage. However, I love the RAAL SR1a because it does not sound like headphones. The only traditional headphone that I liked was the RAAL CA-1a. It is saved by the RAAL ribbon. Otherwise, the sound is pretty much in your head. I am selling the CA-1a to raise some cash not because I do not listen to it.
The SR1a is unlike traditional headphones. That is why they are called earphones. It is like having a 2-channel speaker hanging next to your ear. You end up looking like Princess Leia with the SR1a on your head.
A lot of folks who use the SR1a use it for Classical music because the sound stage is projected out of the headspace, and you can visualize the source of the instruments in a similar way as 2-channel.
I know people who have contacted me saying they sold their Magico speakers and went all in with the SR1a. I can see that. No 2-channel speaker I had owned in the past could beat my SR1a at 2-CHANNEL. That is until I got the Yamaha NS5000 speakers with a CODA #16 amp. That beats the best setup of the SR1a I have had. It is not easy to beat the SR1a even with 2-channel gear. With headphones, for my ears, it is not even a contest.
Best place to learn about the RAAL. Alex and Danny from RAAL and Requiste Audio help out with questions.
Raal Ribbon Headphones - SRH1A | Page 483 | Headphone Reviews and Discussion - Head-Fi.org