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Wideband Audio Performance

The integrated wideband audio performance provides optimum speech quality and a natural tone when PC telephony is used. The HD audio quality lies within the frequency range of 100 Hz to 7,500 Hz in accordance with ETSI ES 202739.


The support of the Hearing-Aid-Compatibility standard (HAC) ensures that the CT 400 PRO also enables wearers of hearing aids to use the latest communication technology.

Further acoustic features

  • Acoustic shock protection (in accordance with ETSI EG 202518 and UL60950-1)
  • Echo cancellation
  • External 8 Ohm passive loudspeaker can be connected *

* These functions can be configured using the API (Application Programming Interface).

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