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KLS –  Kategoriale Lautheitsskalierung

During a categorical loudness scaling test signals are presented at different levels. The subject responds the subjectively perceived loudness in terms of a categorical scale. The scale includes the verbal categories “not heard”,“very soft”,“soft”,“medium” ,“loud” ,“very loud” and “extremely loud”. This verbal scale is mapped to the numeric range of 0 (“not heard”) to 50 (“extremely loud”) and graphically shown as a function of signal level. The so-called “sensation field” representation shows “iso-loudness-contours” as a function of frequency in an audiogram-like chart.


  • Diagnosis of hearing loss
  • Assessment of recruitment phenomenon for sensorineural hearing loss
  • Assessment of fitting paramaters for hearing systems with dynamic compression
  • Verification of hearing system fitting

Narrowband noises with different center frequencies may be used as test signals as well as broadband noises, for instance speech shaped noises.

More Information

Oldenburg Measurement Applications


  • third-octave noises up to 10 kHz for narrowband loudness scaling
  • Iso-loudness-contours showing the dynamic range of hearing as “sensation field”
  • Speech shaped noises for broadband loudness scaling
  • Automatic adaptive loudness scaling according to ISO 16832
  • Premature manual finish of each signal possible
  • Different model functions possible for fitting of loudness functions
  • Manual (non-adaptive) loudness scaling possible
  • Response given directly by the patient possible


520,- € (recommended retail price) plus German statutory value-added-tax for an already existing basic licence.
A basic licence is available for 650.00 € (recommended retail price) plus German statutory value-added-tax (amendments may occur).
Installation and service will be charged by your audiometer provider at cost.


* This document is NOT an electronic instruction manual according to regulation (EC) No. 207/2012, but merely to be used as information material. Only the instruction manual, which is enclosed to the product, has to be used!