Sennheiser HD555


  • Audiophile-grade over-ear, open-back headphones
  • Twist and lock single-sided cable eliminates tangles and simplifies exchanges
  • Gold-plated 1/4″ plug with 1/8″ adapter
  • Highly optimized, field-strengthened neodymium ferrous magnet system
  • Internal Sound Reflector immerses the listener in rich audio

There are a lot of factors that determine the final sound quality of headphones. Although nothing beats trying them in person, these specs can offer some guidance.


Impedance and Sensitivity

Impedance and sensitivity go hand in hand and represent the amount of power required to achieve a certain volume level. Lower impedance and higher sensitivities are better with lower power devices such as MP3 players or smartphones. The Sennheiser HD 558 has a high impedance which may require an amp for best use.
Frequency Response

A headphone’s frequency range represents the lowest and highest pitches that it can output. Human hearing range is usually quoted at 20 Hz – 20kHz, with most music falling well within those bounds. The good low bass range that the Sennheiser HD 558 offers is a pro for bass heavy music listeners, but won’t be as strong as other models with a closed operating principle.
Magnet Material

These headphones use a neodymium magnet which is the most common magnet material for headphones.

Weight is simply a user preference and metric of portability. It does not indicate higher quality headphones as some brands add unnecessary weight to their models. With that said, at 260 grams the Sennheiser HD 558 is average weight for over-ear headphones.


6.35mm (1/4″) inputs are what normally fit into amps and other studio equipment, but are too large for normal personal music players like an iPod.

Weight 0.258 kg
Dimensions 24.13 x 20.32 x 10.16 cm