Ultrasone HFI-2400 S-Logic Surround Sound Headphone Review


The Ultrasone HFI-2400 are open-back headphones with Ultra Low Emission (ULE-technology) offer airy and finest 3-dimensional sound reproduction. Specifically designed detachable velvet earpads will comfort your extensive listening hours. The HFI-2400 is the only Ultrasone HFI model with detachable cable. High class gold-plated drivers, placed according to the basic principle of the S-Logic technology, provide highest sound quality. The design build is solid and feels it too. The quality of finish, is what you would expect of a German company, simply top notch

Ultrasone invented the inimitable S-Logic™ Natural Surround Sound and Ultra Low Emission technologies. Ultrasone integrates safer hearing aspects without neglecting latest technologies.  What that means is that you can listening to higher volumes and still enjoy the sound quality from the headphones.

Now when it comes to sound, I mentioned in the video review it feels like a bathtub of sound, what I should have said is that it feels like you are swimming in sound.You get a great surround sound experince thati can truly say is second to none. Only down side is the sound leaked since these are open back headphone. Overall would I recommend them, answer is yes. Great sound and pure surround sound.


  • S-Logic™ Natural Surround Sound
  • Dynamic principle, open-back
  • Frequency range 10-25.000 Hz
  • Impedance 70 Ohm
  • Sound pressure level 94 dB
  • MU Metal bufferboard, reduced field emissions in accordance with ULE (=Ultra Low Emission) standard
  • Driver 40 mm gold-plated
  • Weight 292 g (without cord)
  • Detachable straight cord (length ca 3 m) with6.3 mm gold-plated plug
  • Extra short straight cord (length 0,8 m) with3,5 mm gold-plated plug
  • Velvet transportation bag
  • Demo CD
  • Instruction manual
  • Long-term availability of spare parts