Equinox audiometer

Manufactured by Interacoustics

The Equinox audiometer is a diagnostic device designed for the evaluation of hearing. It is used to measure an individual's hearing thresholds and assess their auditory capabilities. The Equinox provides a comprehensive set of audiometric tests and features to facilitate the assessment of hearing function.

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Lab products found in correlation

Hda 300 circumaural headphones, by Sennheiser (2 mentions) Eartone 3a, by 3M (1 mentions) Ad629, by Interacoustics (1 mentions)

3 protocols using equinox audiometer

Hearing Screening and Threshold Assessment

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All participants were screened for normal hearing at standard, octave intervals from 0.25 -8 kHz bilaterally. All except 27 (5 LiD, 22 TD) participants additionally completed threshold audiometry at the EHFs of 10, 12.5, 14 and 16 kHz using an Equinox audiometer (Interacoustics, Inc.) and the Hughson-Westlake adaptive method (ASHA, 2005b) . Early in data collection, insert earphones (E-A-R TONE GOLD 3A) were used for standard frequencies and Sennheiser HDA 300 circumaural headphones for EHFs. For most children (n = 114; Hunter et al., 2021) , the Sennheiser headphones were used for all frequencies. Participants were tested alternately with each ear first. They were instructed to respond when they heard a tone by pressing a response button or raising one hand. Those with elevated thresholds (> 20 dB HL) in any of the standard frequencies were excluded and were referred for further clinical care as appropriate. Participants were re-tested if they returned > 6 months after previous testing.

Petley L., Hunter L.L., Zadeh L.M., Stewart H.E., Sloat N.T., Perdew A., Li L., & Moore D.R. (2020). Listening Difficulties in Children with Normal Audiograms: Relation to Hearing and Cognition.

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Hearing Threshold Assessment across Frequencies

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All participants were screened for normal hearing at standard, octave intervals from 0.25 - 8 kHz bilaterally. All except 27 (5 LiD, 22 TD) participants additionally completed threshold audiometry at the EHFs of 10, 12.5, 14 and 16 kHz using an Equinox audiometer (Interacoustics, Inc.) and the Hughson-Westlake adaptive method (ASHA, 2005b ). Early in data collection, insert earphones (E-A-R TONE GOLD 3A) were used for standard frequencies and Sennheiser HDA 300 circumaural headphones for EHFs. For most children (n = 114; Hunter et al., 2021 ), the Sennheiser headphones were used for all frequencies. Participants were tested alternately with each ear first. They were instructed to respond when they heard a tone by pressing a response button or raising one hand. Those with elevated thresholds (> 20 dB HL) in any of the standard frequencies were excluded and were referred for further clinical care as appropriate. Participants were re-tested if they returned > 6 months after previous testing.

Petley L., Hunter L.L., Zadeh L.M., Stewart H.J., Sloat N.T., Perdew A., Lin L, & Moore D.R. (2021). Listening Difficulties in Children with Normal Audiograms: Relation to Hearing and Cognition. Ear and hearing, 42(6), 1640-1655.

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Hearing Assessment Protocol in ARIC Study

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Pure tone audiometry, assessed at ARIC visit 6 (2016-2017), was completed in a soundproof booth using insert earphones (EARTone 3a; 3M) and an Interacoustics AD629 or Equinox audiometer (Interacoustics A/S). Measurement of air conduction was completed at standard octaves from 500 to 8000 Hz. For each frequency, the hearing threshold was recorded in decibels hearing level (dB HL). We calculated a 4-frequency (0.5, 1, 2, and 4 kHz) pure tone average for each ear and modeled a continuous measure of hearing (better-hearing ear pure tone average [BPTA]) scaled to 10 dB HL, with higher BPTA indicating worse hearing function. Hearing was also categorized according to World Health Organization standards as normal hearing (BPTA≤25 dB HL), mild hearing impairment (BPTA of 26-40 dB HL), moderate hearing impairment (BPTA of 41-60 dB HL), or severe hearing impairment (BPTA>60 dB HL).¹⁹

Martinez-Amezcua P., Powell D., Kuo P.L., Reed N.S., Sullivan K.J., Palta P., Szklo M., Sharrett R., Schrack J.A., Lin F.R, & Deal J.A. (2021). Association of Age-Related Hearing Impairment With Physical Functioning Among Community-Dwelling Older Adults in the US. JAMA Network Open, 4(6), e2113742.

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