The only difference between the standard and PROLINE is the reduction level of magnetic field emission. The standard version has reduced magnetic field emissions of 60%, PROLINE 98%. Is the PROLINE something you need? Depends. If you're concerned that you're getting more than your fare dose of magnetic field emissions in your daily life and don't want them so close to your head, then the PROLINE is for you. There is no difference in sound quality between the standard and PROLINE.
Feel the beat ... with HFI-550!
Foldable, closed-back superior headphones
with S-Logic™ Natural Surround Sound
Free demo-CD enclosed
S-Logic™ Natural Surround Sound System
Reduced magnetic field emissions
Standard LE (low emission)
Frequency range 15 Hz - 22.000 Hz
Impedance 64 ohm
Sound pressure level 100 dB
Cord length ca. 3 m
3,5/6,3 mm gold-plated plug
Weight LE 265 g (without cord)
Long-term availability of spare parts
MPN PROLINE550 1 1
S-Logic™ Natural Surround Sound
Through the S-Logic™ Natural Surround Sound the usual headphone sound will be moved out of the head in the room around you. The sound is no longer locked in, but appears broad and detached. Directions and distances can be heard and perceived - it's just like being in a live concert.
For this new technology additional equipment is not required. A pair
of ULTRASONE headphones plus a simple CD player and you will be
ready for the 3-dimensional music enjoyment!
In addition, the HFI-550 is easy on the ears: The S-Logic™ Natural Surround Sound System allows an up to 40% lower dB output (3-4 dB) for the same loudness sensation, thereby the risk of hearing defects may be reduced enormously.
Reduced magnetic field emissions
Like all ULTRASONE products, the HFI-550 has a strongly reduced radiation. The standard version LE (= low emission) offers a reduction of approx. 50% in comparison with ordinary headphones.
It is certified and recommended by Technical Surveillance Organi-
sations and Consumer Advice Centers with certified lowest magnetic field emissions.
Its robustness in addition to the Natural Surround Sound System makes the HFI-550 to one of the most demanded headphones in
the consumer sector. Customers appreciate its dynamic and power spectrum.
With its particularly efficient 50 mm Mylar-electro acoustical trans-ducer these headphones produce an impressive sound pressure even with a high environmental sound intensity. Furthermore it is made for
high power input.
Due to customer enquiries and requests we implemented an additional function which enables you to fold back and up the individual earpiece without removing these headphones from your head in order to be con-nected immediately with the "outside world" again. Because of this folding mechanism, these headphones can be compactly stored and easily transported in a suitcase. Thanks to its closed construction, external noise is suppressed. You can thereby concentrate exclusively on the transferred music or spoken language you are listening to.
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25 foot Headphone Extension Cable, 1/4 in TRS to 1/4 in TRS