[Mellowship]

The Koss PortaPro, every time I put them on.
It's not "how good they sound", it's more a "wow, how can it be that they are so cheap and so flimsy and yet they sound so fun, engaging, enjoyable with every genre". It's just baffling.

 

[nadman12]

Decades ago it was the HD-600's. I never heard anything so neutral before that. But recently, the biggest wow factor cam from the Audeze LCD-MX4. Sounds perfect even powered by a phone - neutral, dynamic with a huge soundstage. I also used to have a bit of ringing after using my Sennheiser headphones (even at lower volumes) but I'm not having that with the Audeze MX4.