Speech Audiometer or Speech Mode of a Clinical Audiometer: The instrument used for speech audiometry is the speech audiometer. Although devices designed specifically for speech audiometry were used in the past, this function is now incorporated into general-purpose clinical audiometers.
The characteristics of audiometers, including those used for speech audiometry, are given in the American National Standard Specifications for Audiometers (ANSI S3.6-2010).
Block diagram of the speech mode (channel) of a clinical audiometer

The speech mode (or the speech channel) of the clinical audiometer includes the following components:
- various sources of recorded speech material, such as a tape deck, compact disk (CD) player, and a computer.
- a microphone for live-voice testing.
- an input selector button to select the related source of the speech materials.
- an input level control, which is used with a VU meter to ensure that the speech signals are at the levels necessary for them to be properly calibrated.
- an attenuator to control the level of speech being presented to the patient.
- an output selector to direct the speech stimuli to the desired output transducer.
- output transducers (earphones, loudspeakers, bone vibrator).
These components are illustrated In the picture above.
Two-room test setup for speech audiometry
Typical two-room test setup for speech audiometry. Two enclosed rooms are needed, including one for the examiner, because speech is often presented using live voice and a microphone. The enclosed room for the audiologist helps to minimize pickup of unwanted environmental sounds by the microphone during such testing.

References:
- https://www.ishaindia.org.in/pdf/Guidelines-Standard-Audiometric-Screening-Procedures.PDF
- https://www.asha.org/PRPSpecificTopic.aspx?folderid=8589935335§ion=Assessment#Speech_Audiometry
- Essentials of Audiology – Stanley A. Gelfand, PhD (Book)
- Audiology: The Fundamentals – FRED H. BESS, PhD (Book)
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