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Ultrasone HFI-2400 Headphones

  • Product Description
  • Product Video
  • Product Accessories
  • Warranty

Ultrasone has released the Ultrasone HFI-2400, its flagship HFI Series headphone. Distinguished by its tone and modern design, the HFI-2200s 40mm gold-plated driver provides 'three-dimensional" sound thanks to Ultrasone's exclusive S-Logic technology. The Ultrasone HFI-2400 comes outfitted with MU Metal shielding, similar to all other Ultrasone headphones, which reduces the amount of magnetic radiation emitted from standard headphones, up to 98%.

Each Ultrasone HFI-2400 comes with a removable three-meter long, straight cable with 6.3 millimeter gold-plated stereo plug, a velvet carrying bag. Ultrasone incorporates its own developed and exclusive S-Logic technology in all of its headphones. It claims to present a precise sound that listeners feel as if they are in a live concert. At the same time, the sound pressure is reduced by approximately 3-4 dB providing 40% less burden and strain on the eardrum. The technology is at the heart of every Ultrasone headphone and makes sure that that the music is phonetically and spatially at the highest levels. The headphones integrate the entire pinna, or outer ear, into the hearing process the way nature meant us to hear, so that the sound is considerably more natural than normal headphones or in-ear phones.

Ultrasone HFI-2400 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 audio fidelity.

  • 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 3m)
  • 6.3 mm gold-plated plug
  • Velvet transportation bag
  • Demo CD
  • Instruction manual
  • Long-term availability of spare parts


Review from macnn:

Germany's Ultrasone typically scales to the upper echelon headphones. The HFI-2400 headphones are Ultrasone's flagship consumer model with an official price of $330; while expensive, it's a bargain compared to pro and DJ products that retail for twice as much. No matter the model, Ultrasone's claim to fame is its S-Logic natural surround sound, which it equates in video parlance to the difference between watching a movie in 2D versus 3D. It all sounds very impressive -- pun intended -- but we'll find out how well it works in our review.

The Good
Impeccable construction.
Balanced, rich acoustics.
Long, durable cabling.

The Bad
Relatively high price.
Open air design not for everyone.
Poorly translated manual.
Box contents and build quality

The 2400s ship with a black velvet carrying bag, a studio quality nine-foot audio cable, a 6.3mm-to-3.5mm audio adapter, and a packet holding the usual demo CD and documentation. The velvet bag is large and holds the 2400s and the nine-foot cable easily. We really appreciate the cable length, as most headphones typically ship with a four- to six-foot cable; the extra couple of feet can sometimes be useful, especially in a listening room. Ultrasone threads the connector that is inserted into the headphones, while the other side of the cable ends in a 6.3mm studio jack. We really like the threaded connection on the headphone end as it gave a firm connection. All of the plugs were gold plated, including the minijack adapter; there's a debate as to whether this is ever effective, but it can't hurt.

The demo CD that Ultrasone has is full of mostly classical music by German composers such as Bach and Beethoven; it's useful to test the high range of audio. There are a few other classical tracks on the CD as well as some non-musical audio tracks such as applause and outdoor sounds. The documentation booklet that comes with the 2400s has a decent amount of information in it, but it's very poorly translated. Many of the sentences seem to have been put into a translation program and not edited with regard to syntax or common word usage. We were able to understand everything in the booklet, but it was quite distracting as you spent more time deciphering than learning.

The headphones themselves are built very well. The ear cups can rotate 90 degrees to lay flat to store in the bag. The padding at the top of the headband and around the earphones is soft and very thick. Upon removing the headphone covers, you can find the single 40mm drivers situated behind a protective metal covering. While largely made of plastics, the headphones are given very heavy-duty contruction; there is nothing about the headset that doesn't ooze quality.

Audio quality and experience
The 2400s are open air headphones, leaving no deliberate sound isolation either inside or outside. People several feet from the headphones can hear them at a volume similar to what a cellphone call would have from the same distance. This also means that sounds from the environment around you will seep in. A preference between open air and closed air headphones is more of a situational issue or matter of personal preference; in terms of this review, the 2400s seemed to let in no more or less outside sounds than we would normally expect.

The S-Logic technology Ultrasone uses in the 2400s is described as putting sound around your ear instead of into it. From our usage, this seems to be an accurate description: athe audio fidelity felt like that of external speakers, not typical headphones. This effect is accomplished by placing the drivers in the corner of the headphones instead of directly facing into the ear. In our opinion, S-Logic is more than marketing buzz on the package or website; it's a true improvement to the listening experience.

We listened to a variety of tracks ranging from the classical tunes provided by Ultrasone to techno, dance, rock, and pop. We were consistently satisfied with the audio quality of the 2400s given your price point. We even compared the 2400s side by side to the Beats by Dre that we recently reviewed. The audio quality was quite comparable between the two, but the comfort of the larger 2400s and your open air design was our personal preference. The 40mm drivers provided ample volume and could handle highs, mids, and lows from a variety of musical styles adeptly, without being drowned out or overemphasized.

Wrapping up
If you're in the market for a very high quality pair of headphones with excellent acoustics, you need to at least consider the 2400s. The combination of great build quality and excellent sound should put these on the short list of anyone who is shopping for a pair of open air headphones in the $300 to $400 price range. It's a cliche, we know, but this pair was music to our ears.

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Ultrasone warrants its products to be free from defects for 2 years from the date of purchase.