Nine participants (2 female) with an average age of 25 (18-34) were recruited from the greater Lafayette area through posted flyers and advertisements. Audiograms were measured using calibrated Sennheiser HDA 300 headphones by employing a modified Hughson-Westlake procedure. All subjects had hearing thresholds better than 25 dB HL in both ears at octave frequencies between 250 and 8 kHz. All subjects provided informed consent, and all measurements were made in accordance with protocols approved by the Internal Review Board, and the Human Research Protection Program at Purdue University.
Hda 300 headphones
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Sourced in Germany, Denmark
The HDA 300 headphones are professional-grade audio devices designed for laboratory and research environments. They feature closed-back circumaural design, with high-quality transducers and robust construction, providing reliable sound reproduction for critical listening applications.
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Lab products found in correlation
8 protocols using hda 300 headphones
1
Hearing Threshold Screening Protocol
2
Comprehensive Audiological Assessment Protocol
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An Otometrics Madsen Zodiac tympanometer was used to assess middle ear function and acoustic reflex thresholds (ARTs) according to the Jerger classification.[21 (link)] Participants who had a Type A tympanogram and who had ipsilateral and contralateral reflexes were recruited for this study (-100 to +50 daPa).
PTA, speech audiometry, and extended high-frequency audiometry (EHFA) tests were performed using Otometrics Madsen Astera.[2 ]. Air conduction (AC) thresholds were measured with TDH-39 headphones (from 125 to 8000 Hz), and for EHFA (9500 to 16000 Hz) Sennheiser HDA 300 headphones were used. Bone conduction (BC) thresholds were obtained (from 500 to 4000 Hz) using a B-71 bone vibrator. Hearing loss was determined using the Goodman classification.[22 ] Distortion product otoacoustic emissions (DPOAEs) were measured using an Otometrics Madsen Capella[2 ] at 500 to 8000 Hz, with a 65/55 dB stimulus to compare signal-to-noise ratios (SNRs) (f1/f2 = 1.22, octave = 2 pts/oct).[23 (link)]
PTA, speech audiometry, and extended high-frequency audiometry (EHFA) tests were performed using Otometrics Madsen Astera.[2 ]. Air conduction (AC) thresholds were measured with TDH-39 headphones (from 125 to 8000 Hz), and for EHFA (9500 to 16000 Hz) Sennheiser HDA 300 headphones were used. Bone conduction (BC) thresholds were obtained (from 500 to 4000 Hz) using a B-71 bone vibrator. Hearing loss was determined using the Goodman classification.[22 ] Distortion product otoacoustic emissions (DPOAEs) were measured using an Otometrics Madsen Capella[2 ] at 500 to 8000 Hz, with a 65/55 dB stimulus to compare signal-to-noise ratios (SNRs) (f1/f2 = 1.22, octave = 2 pts/oct).[23 (link)]
3
Comprehensive Audiometric Threshold Assessment
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Pure tone air and bone conduction thresholds were recorded using an Interacoustic AC 40 clinical audiometer (Assens, Denmark) using Telephonics TDH-39 supra-aural headphones (Farmingdale, New York, USA) at 0.25–8 kHz frequencies. Bone conduction hearing thresholds were determined using a RadioEar B71 bone vibrator (Middelfart, Denmark) at 0.5–4 kHz frequencies. Extended high-frequency audiometry thresholds at 10–14 kHz frequencies were determined with an AC 40 Interacoustics clinical audiometer using Sennheiser HDA300 headphones (Wedemark, Germany). Thresholds were determined using the Hughson–Westlake method.
4
Comprehensive Hearing Acuity Assessment
5
Comprehensive Hearing Acuity Assessment
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Hearing acuity was assessed in a sound-attenuating booth (350 Series MaxiAudiology Booth by IAC Acoustics) which met the standard for maximum permissible ambient sound pressure levels. Pure tone audiometry was administered via the Interacoustics Callisto Suite configured to the Interacoustics OtoAccess database, operated from an HP Envy laptop with sound delivered by Sennheiser HDA 300 headphones. The program was set to deliver pure-tone stimuli in the following order: 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz, 12500 Hz, and 500 Hz. Presentation intensity levels began at 40 decibels at hearing level (dB HL) for normal hearing Study members, and 60 dB HL for hearing aid users. Audiometry used the Hughson-Westlake procedure (ISO8253–1:2010; Acoustics-Audiometric test methods-Part1: Pure-tone air and bone-conduction audiometry) in which participants respond when they hear a pure tone. Auditory thresholds, defined as the lowest intensity level that the individual responded to, for 2 out of 3 presentations, were determined using a standard down-10-up-5 technique for each frequency. A four-frequency pure-tone average was calculated by averaging 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz; and a high pure-tone average was calculated by averaging 8000 Hz and 12500 Hz. The results for the “best ear” are reported.
6
Tympanometry and Pure-Tone Audiometry Protocol
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An Interacoustics Titan device (Middelfart, Denmark) was used for tympanometry. The tympanometer probe was inserted into the external auditory canal. A 1,500 ms pulsed 226 Hz probe tone was presented, and middle-ear pressure and compliance readings were recorded. Participants were excluded from the study if they were classified with results different than type A in both ears, based on Jerger’s classification (Jerger, 1970 (link)): middle ear compliance < 0.2 cc or middle ear pressure < –150 daPa (decaPascals).
Air-conduction pure-tone thresholds were obtained bilaterally with an Interacoustics AC629 clinical audiometer (Middelfart, Denmark) and Sennheiser HDA 300 headphones. The Hughson-Westlake procedure described by Carhart and Jerger (1959) (link) was used. Hearing thresholds at 0.5, 1, 2, 3, 4, 6, 8, 9, 10, 11.2, 12, and 14 kHz were obtained. Included participants presented with hearing thresholds from 0.5 to 8 kHz, equal to or better than 20 dB HL in at least one ear.
Air-conduction pure-tone thresholds were obtained bilaterally with an Interacoustics AC629 clinical audiometer (Middelfart, Denmark) and Sennheiser HDA 300 headphones. The Hughson-Westlake procedure described by Carhart and Jerger (1959) (link) was used. Hearing thresholds at 0.5, 1, 2, 3, 4, 6, 8, 9, 10, 11.2, 12, and 14 kHz were obtained. Included participants presented with hearing thresholds from 0.5 to 8 kHz, equal to or better than 20 dB HL in at least one ear.
7
Psychophysical Experiment: Auditory Perception
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The experiment was written in Octave using the Psychophysics Toolbox extensions (Brainard, 1997; Pelli, 1997; (link)Kleiner et al., 2007) (link) and the PSYCHOACOUSTICS extensions (Soranzo & Grassi, 2014) (link). The software was implemented with an ASUS computer (Cpu Intel i5 650 3.20 GHz, Motherboard Asus P7H55-V RAM 4 GB, Graphic Card AMD Radeon HD 5700 Series, OS Windows 7 Professional 64 bit). The computer was connected to a monitor (NEC MultiSync FE950þ) and M-AUDIO FastTrack Pro sound card. The output of the sound card was delivered to a pair of Sennheiser HDA 300 headphones. The audiometer for the audiometric screening of the participants was an Interacoustics AD229b. Audiometric screening and experiment were run inside a single walled IAC sound proof booth. The code for running the experiment is available from: h t t p s : / / o s f . i o / b g 4 9 u / ? vi e w _ o n l y = e 1 a e a 4 f c c 5 e b4784b9dd98426918f547
8
Occupational Hearing Assessment Protocol
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Audiologic evaluations were performed on 7890 workers on site by qualified medical assistants in soundproof chambers. The tests were performed at least 12 hours after the participant’s last shift in the noise-exposed job. Otoscopic inspection and tympanometry were performed on each participant to establish the normal function of their external and middle ears. Tympanograms were measured using a TympStar tympanometer (Grason-Stadler). The passing criterion was a type A tympanogram (peak between −100 and 100 daPa). PTA was measured separately for each ear using a Type 1066 manual audiometer (Natus Hearing & Balance) with Sennheiser HDA-300 headphones for the clinical and EHF audiometric ranges. All thresholds were calculated in dB hearing level, and audiometers were calibrated annually according to the ISO 389-5-2006 standard. If a participant did not respond to at the maximum output of the audiometer at the EHFs (90, 80, and 60 dB hearing level for 10, 12.5, and 16 kHz), the data were removed to eliminate saturation effects.
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