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Tubephones & Accessories

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Ear Tubephone
Part #: OUT101A, OUT101E, OUT101T

Use the OUT101A tubephone to deliver clicks and tones in auditory evoked response applications (e.g., ABR auditory brainstem response). The Tubephone transducer attaches to a short, flexible, plastic tube, which fits into the subject’s ear(s) 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.

Advantages 

  • Incorporates “”touch-proof”” electrical connection for safety
  • Smooth frequency response
  • Provides 30+ dB external noise exclusion—equivalent to a single-wall booth when used with deeply-sealed foam eartips
  • Provides 70+ dB isolation (interaural attenuation) between ears; reduces the need for masking
  • Reduces test/retest variability compared to supra-aural earphones
  • Eliminates test errors due to collapsed ear canals

Accessories

OUT101E Replacement Foam Ear Inserts: pkg. of 50
OUT101T Replacement Plastic Tubes: pkg. of 4

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

Details

Compatibility


OUT101A Includes:

  • Earphone (50 Ohm)
  • 7′ cable with 6.33 mm (1/4″) plug
  • 10 foam eartips (regular, 13 mm)
  • 10 foam eartips (small, 10 mm)
  • 1 foam eartips (large, 18 mm)

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 OUT101A 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 OUT101A foam tip. The OUT101A 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 OUT101A Tubephone.

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