Acoustics

Door Acoustics are a Signifier of Quality

Sounds good: Customers value a quality door-closing sound, a flush door-closing sound and an inconspicuous, quality locking and unlocking signal. Selective change to the individual sound components in terms of their volume, frequency configuration and duration allow the entire tone spectrum to be adjusted individually.


Kiekert has always been a leader in door closure acoustics design. Together with vehicle manufacturers, we develop individual sounds that convey the specific brand image and make the acoustics of a car door unmistakable.


The feel of safety is confirmed, for example through a fitting door-shutting acoustic. Brand-specific attributes such as quality, precision or dynamics are expressed through the appropriate sound design. Kiekert delivers answers to these individual customer requests and, at the same time, helps make each vehicle model a bit unique.

We design the audible quality in door acoustics with the following measures:

  • Mobile acoustic chambers for total vehicle evaluation
  • The most modern analysis tools
  • Recording of force, path, body and airborne noise without influence on the system
  • Transient and stationary processes
  • High-speed recording (up to 32,000 images/sec) for correlating the sound and movement
  • Analyses based on air and body noise
  • Optimization of the running and operating noises from actuators (sliding doors, power closing …)
  • Proprietary development of highly specialized hardware and software
  • Purely mechanical door closures (maintenance of usable energy theorems)
  • Freely adjustable door counter pressures and shutting speeds

The result yields an overall acoustic impression that wins bonus points. An important detail is the significant reduction of the opening and closing tone due to a uniform release of the catch as well as a gentle fall of the pawl and locking lever.


With our premium "double pawl", we attain a reduction of opening noise by 20 dB (A). A reduction of 10 dB (A) reduces the perceptible "pop-off" sound by half. The simultaneous reduction of the door-opening force makes it possible to increase the door sealing pressure considerably. This significantly improves the interior acoustics of the vehicle.