Fischer Amps Partners with Sennheiser to Build Custom IEMS

Fischer Amps helps Sennheiser deliver the sound of the IE500 Pro in the comfort and style of a custom in-ear monitor.

This article is Authorized by the In-Ear Monitor International Trade Organziation

This is a new announcement from one of our founding members. Our members are always pushing the boundaries of what is sonically possible for in-ear monitoring.

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August 18, 2021

Leveraging nearly 100 years of combined audio expertise, German audio companies Fischer Amps and Sennheiser  have teamed up to create custom in-ear monitors that deliver uncompromising fit, sonic accuracy, and performance. The FA 500 Custom in-ear monitor combines the sonic perfection of Sennheiser's TrueResponse® transducer technology with Fischer Amps' precise, custom-fit enclosures that provide the level of comfort and isolation that professional artists and sound engineers demand.

Because the FA 500 Custom in-ears are based on the anatomical shape of your ear and the auditory canals, they are extremely comfortable and provide a complete seal throughout your entire performance. They are uniquely tailored to your ear shape and therefore provide perfect sound isolation from ambient noise. They come in 10 customizable colors.

The single wideband transducer, which is only 7 millimeter in size, covers the entire frequency range. Phase incoherency - which can be experienced with multi-driver systems - no longer exists. This technology enables sound reproduction with near-zero distortion even at maximum sound pressure; achieving up to a 100 times lower harmonic distortion than balanced armature drivers. This enables a sound reproduction that allows hearing in the finest nuances.

Watch this quick video for a detailed explanation on how the TrueResponse® transducer technology works.

As noted, in multi-way systems, crossover in individual frequency ranges of the sound source for bass, midrange and treble frequencies may lead to phase coherence problems and thus to a compromised sound quality. In addition, balanced armature drivers can have a significantly higher degree of distortion than a dynamic driver. Here is a visual example as measured through a GRAS RA402 Ear Simulator.

Technical Data

  • Frequency response6 – 20,000 Hz
  • Country of originGermany
  • THD, total harmonic distortion< 0.08 % (1 kHz, 94 dB)
  • Sound pressure level (SPL)126 dB (1 kHz / 1 Vrms)
  • Transducer principleTrueResponse® technology (7 mm wideband transducer), dynamic
  • Attenuationup to 26 dB
  • Impedance16 Ohms
  • Connection cable3.5 mm jack plug, detachable
  • Cable length1.3 m

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