Being a music lover and possessing pretty decent headphones (Beyerdynamic DT 880s), I saw all the good reviews of this app and though Id check it out, though I was a bit skeptical. Now that Ive spent some time with it, Im truly amazed! I run the speaker angle maxed with the amount set to 75%, so its subtle yet makes a huge difference in the listening experience. It sounds as though the gap between the left and right drivers is filled, providing better spacing and better (not "more") bass. I dont mess with the EQ that much since my headphones are already pretty flat, but it seems very decent. The UI is simple and well-animated. Its nearly perfect. My only request is for an option to have a traditional left-to-right scrubbing bar, as the circular one does get on my nerves at times.
This is a must-have for audiophiles, period. You wont be disappointed in your purchase.
UPDATE: Id like to see proper scaling for the iPhone 6. It doesnt look bad; the UI just looks a bit too large and a tiny bit pixelated at the moment.
Geo_212 about CanOpener — for Headphones