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Tubephones & Accessories

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Ear Tubephone, Single Channel
Part #: OUT101, OUT101E, OUT101T

Use the OUT101 tubephone to deliver clicks and tones in auditory evoked response applications (i.e. ABR). The Tubephone design consists of a monaural acoustic transducer attached to a short, flexible, plastic tube, which fits into the subjects ear with the aid of a foam tip. Use of the Tubephone reduces ambient noise and bone conduction problems, which can interfere with auditory response recordings. Furthermore, because the Tubephone provides a 1 msec acoustic signal delay (due to plastic tube), it automatically separates true response from electromagnetic artifact resulting from speaker activation.

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Part #: N/A
Categories: Stimulation - Education, Stimulation - Research
Subcategories: Auditory Stim Accessories - Education, Auditory Stim Accessories - Research

Details

Compatibility


MP160/150/100 System interface

STM100C connects directly to stimulator model

MP36 and MP36R System interface options

Use 1/4″ to 1/8″ phono adapter and

  • MP36/36R Headphone port—no stimulator required!—volume may not reach the same levels as the Analog Out port
    or
  • BSL System stimulator (model BSLSTM) via BSLCBL6

Calibration for Auditory Brainstem Response Studies

To calibrate the OUT101 Tubephone, use an Etymotic ER-7C Probe Microphone—this microphone provides a calibrated output voltage which is a function of applied Sound Pressure Level (SPL). The sensitivity is 50 mV/Pascal (-46 dB re: 1 V/uBar): 0 dB SPL = 0 dBuV.

Place the Probe Microphone insert tube in the auditory canal prior to the insertion of the OUT101 foam tip. The OUT101 Tubephone sound delivery tube and the Probe Microphone sound input tube will then be exposed to the same auditory chamber. Accordingly, the SPL is recorded, via the Probe Microphone, simultaneously with applied auditory stimulus from the OUT101 Tubephone.

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