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Er 2 transducers

Manufactured by Etymotic Research
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The ER-2 transducers are a type of in-ear audio equipment designed and manufactured by Etymotic Research. They are professional-grade transducers that provide accurate sound reproduction and are primarily used for audiometric and hearing research applications.

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Lab products found in correlation

Pa 5 programmable attenuators, by Tucker-Davis Technologies (1 mentions)

2 protocols using er 2 transducers

1

Ipsilateral DPOAE Measurement with Contralateral Noise

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Seven frequencies were used as ipsilateral primary tones, delivered to the right ear, for eliciting DPOAEs at different positions of the cochlea (f2 = 1,440, 2040, 2,884, 4,080, 5,769, 6,125 and 8,160 Hz), while contralateral broad-band noise (~ 60 dB SPL) was delivered to the left ear. Both stimuli were digitally generated by two synchronized PCI boards (6,071-E, National Instruments) at 100,000 samples/s, attenuated with PA-5 programmable attenuators (System 3, Tucker-Davis Technologies) and delivered through ER-2 transducers (Etymotic Research) sealed to both external auditory meatus and pinna. Primary tones were presented at a rate of 4 Hz with a duration of 15 ms, 5 ms rise/fall time, a fixed ratio of f2/f1 = 1.25 and L1/L2 = 65/60 dB SPL, with a delay of 200 ms. Contralateral non-continuous broad-band noise (BBN, 0.2–10 kHz) was delivered at a presentation rate of 4 Hz with a duration of 170 ms. At the beginning of each experiment sound pressure level calibrations were made in both ears using an Etymotic® microphone.
Bowen M., Terreros G., Moreno-Gómez F.N., Ipinza M., Vicencio S., Robles L, & Delano P.H. (2020). The olivocochlear reflex strength in awake chinchillas is relevant for behavioural performance during visual selective attention with auditory distractors. Scientific Reports, 10, 14894.
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2

Swept-Tone Stimulus-Frequency OAE Measurement

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The general swept-tone SFOAE procedure is detailed in a previous report
(Mishra & Talmadge 2018 (link)). SFOAE
measurements were performed using an ER-10B+ probe microphone system with ER-2
transducers (Etymotic Research, Elk Grove Village, IL). Stimulus calibration in
the ear canal was performed using a depth-compensated technique (Lee et al. 2012 (link); Mishra & Abdala 2015 ). Probe and suppressor tones, at 40 and 60
dB SPL respectively, were swept at a rate of 0.188 octaves/s in a two-interval
paradigm. The suppressor frequency was 1.1 times higher than the probe
frequency. The sweeps consisting probe only, and both probe and suppressor tones
were interleaved, and the phase was inverted for every other use of the
suppressor. SFOAEs were estimated from at least 8 probe and
probe-plus-suppressor pairs using a least-squares fit method. The least-squares
fit models both probe and suppressor sweeps and estimates SFOAEs to minimize the
sum of the squared error between the model and the response. The noise floor is
estimated from the average of pairwise sweep difference obtained by subtracting
the probe from the probe-plus-suppressor.
Mishra S.K., Zambrano S, & Rodrigo H. (2021). Sexual dimorphism in the functional development of the cochlear amplifier in humans. Ear and hearing, 42(4), 860-869.
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