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However, in the cases of clinical examinations, for research purposes, or if the testing location is close to a shop floor, a double-wall device may be needed, resulting in higher costs.Īnother issue is the floor loading caused by the weight of the booth, as well as the space that it occupies. In many cases, it exceeds the cost of the audiometer! Single-wall booths can be installed with substantial savings, but they are only suitable in a relatively quiet place or when they are used for routine survey tests. Probably the most important is their cost. There are several problems associated with the use of audiometric booths. This is also a frequent problem with mobile audiometric facilities located in parking lots. This is a situation that can occur in locations close to a corridor with audible traffic noise or with windows facing a street. If such a situation occurs, the test has to be interrupted and resumed once the noise levels have been reduced below the limit. The values in Table 1 are the maximum allowed, meaning that they should not be exceeded at any time. † Audiometric testing at pure-tone frequencies below 500 Hz, if conducted, requires lower maximum ambient noise levels at octave bands of 125 Hz and 250 Hz than those specified in this table. * The maximum noise levels by octave band specified in this table are from ANSI/ASA S3.1. As an example, at 125 Hz, the allowable background noise for supra-aural earphones is 49 dB, whereas inserts allow up to 78 dB at the same frequency However, insert earphones are slightly more effective than supra-aural, especially at low frequencies. Both types of earphones, included in the table, are effective at reducing background noise. As an example, the latest Canadian Standard Association (CSA) Standard for audiometric tests, reproduced here as Table 1, shows the maximum permissible ambient sound levels at the different octave bands ranging from 125 to 8000 Hz. The booth also diminishes the opportunity for distraction of the examinee.Ī low background noise is of such an importance as to be included in the standards for audiometric tests. The booth is to reduce background noise and, as a consequence, the number of false positive results. Audiometric booths constitute part of the basic equipment conventionally thought to be required to perform hearing tests.
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