Field Report: Ultrasone Pro 750

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Wearing headphones every day as a radio disc jockey and recording musician, there are a few things I require in a good pair: great sound, comfort, durability and serviceability. The Ultrasone Pro 750 headphones measure up to all my requirements.

The feature that makes Ultrasone headphones different is the use of its patented S-Logic Technology to create three dimensional, natural surround sound. The concept is that the outer ear is responsible for three dimensional hearing, so instead of the headphone driver being centrally located and aimed directly at the inner ear, the drivers are directed at the outer ear. Allowing the sound to be reflected off the outer ear not only creates a natural three dimensional sound, but also helps to cut down fatigue by reducing the sound pressure level at the eardrum by up to 40 percent or 3 - 4dB, according to Ultrasone. The drivers are titanium and the frequency response is listed as 8Hz - 35kHz. I am very pleased with the sound of these headphones. The bass response is very natural, not overbearing, and the highs are crystal clear without being shrill or tinny sounding. To my ears the S-Logic natural surround sound does what it's supposed to do. They sound as if I am not wearing headphones at all, but instead listening to music live or through good sounding loudspeakers. It's as though I can hear the air around the music. I have also noticed they are much less tiring to wear than other headphones, which brings me to the next point.

Performance at a glance
Closed earpiece
Velour earpads
40mm Titanium-plated mylar driver
Frequency response 8Hz - 35kHz
40 ohm impedance
Up to 94dB SPL

The headphones are very comfortable to wear. The ear pads are soft velvet and there is also a velvet pad that rests the headphones on top of your head. The fit is tight enough to hold the ear pads closed, but not so tight as to squeeze one's head. The manufacturer suggests these headphones should always be worn with the left and right ear capsules over the correct ears and with the frame fully on top of the head to achieve the natural surround sound effect. There is a noticeable change in sound quality if this is not done. And if they are not worn properly, the headphones don't fit very well, so it's not much of a problem. They are relatively light weight at 295g without the detachable cord.

Long-term comfort

After wearing these headphones for several hours at a time in both the radio and recording studio, my ears were much less tired than with other headphones. In the recording studio, I have to be able to hear the sound of the track mixed with the sound of my own instrument or voice louder than the actual sound of the instrument in the room. With some headphones this means turning the volume up so loud that not only do my ears become exhausted, but I lose the ability to hear the pitch correctly. In the recording studio, I could hear everything perfectly clearly, along with my own track and at a very comfortable volume level. Singing was also easier with these phones as the volume wasn't so loud as to affect the pitch. It is worth noting that the Pro 750 headphones are of a closed back design as opposed to the Pro 2500, which are open back. I prefer the closed back to prevent any sound leakage from the phones to the microphone, a must in the radio or recording business.

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