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Home of the TV SoundShower™ ListeningLamp™

"It's time to hear what you've been missing"
        ...just an audiologist with a better idea!

AcoustiCover™ Infection Control and
Acoustically Transparent Earphone Covers

Order Products | Summary of Safety and Effectiveness

It's time to practice safe tests.

NEW PRICE! $0.16 each

AcoustiCover™ I
for audiologists

AcoustiCover™ II
elastic earphone covers - 3" and 5"
500 covers per container
Elastic Earphone Covers
500 covers per container
Elastic Earphone Covers


  • Viral, bacterial, fungal, rickettsial infection control & still acoustically transparent (studies available by request)
  • Requires no change in audiometer calibration
  • Heightened sense of patient, client, student trust
  • Applies and discards in seconds
  • No wetting of earphone surfaces for up to 10 minutes to ensure complete disinfection
  • No damage to clothing and furniture from chlorine solution spills
  • User friendly dispenser
  • All reasonable sizes are available
Orders and Inquiries:
Call Toll-Free (509) 663-1072 Pacific Time Zone
Email the developer: kullrich@nwi.net


PATENT #5,545,859
Infection Control - Acoustically Transparent

Recent concerns for patient/ client health prompted the ASHA Committee of Quality Assurance to encourage all clinicians who provide services in any work setting to incorporate the Centers for Disease Control's modified "Universal Precautions" (ASHA, 1989).

Time constraints, inconvenience, and risk of earphone transducer damage by liquids such as alcohol and bleach/water solutions have resulted in an unacceptable lack of earphone cleanliness by today's recommended standards. Although the risk of patient/client cross-contamination by viral, bacterial, fungal and rickettsial micro organisms is very small, the patient/client deserves and will increasingly demand that shared instrument surfaces be clean and free of contamination.

The disposable infection control and acoustically transparent earphone cover protects the patient from cross-contamination without necessitating the need to re-calibrate the audiometer.

Five Studies Evaluated the Infection Control and Acoustical Properties of the Cover:

A viral penetration study examined the qualities of the earphone cover material (Nelson Lab., 1992). "The study consisted of placing a viral suspension with a concentration of greater than 1 x 6^6 PIaque Forming Units/mL (PFU/mL) on the surface of the test sample in an assay plate. The test incorporated the viral challenge into sterile simulated serum to simulate the surface tension effects of serum. Test samples were exposed to the challenge for up to 1 hour." "The triplicate results of the (sample) showed no viral penetration occurring on the assay plates, indicating that the samples were effective barriers to the virus challenge throughout the 60 minute exposure time."

In an acoustical transparency study, sponsored by the Veteran's Administration, National Institute of Standards and Technology evaluated the effects of the cover with KEMAR (Burnett, 1993). Measurements of frequency and dB were taken without and with the cover on; differences were 3.3dB or less at all audiological test frequencies. The effects caused by the tensioning of the cover (limp verses taut) are audiologically insignificant.

In a separate KEMAR study of the earphone cover, Revit (1992) found no practical differences (cover on versus cover off).

Five randomly chosen prototype covers were evaluated for Percent Total Harmonic Distortion (Overturf, 1992). No distortion was noted for any of the covers.

The final acoustical transparency study evaluated the effect of the earphone cover on the pure tone thresholds of twenty-seven adult subjects (fifty ears) (Ullrich, 1992). A paired sample t-test statistical analysis of the threshold differences was run for all frequencies. At all frequencies, little, if any, cover effect was found. The greatest cover on versus cover off difference was only 2.2dB. The standard deviations were all less than 5dB and reflect the 5 dB audiometer steps more than an actual cover effect.


  • AIDS/HIV: "Implications for Speech-Language Pathologists and Audiologists", ASHA June-July 1989), pp 33-38.
  • E.D. Burnett, "The Acoustical Performance of Earphone Covers with KEMAR", National Institute of Standards and Technology (United States Department of Commerce 1993), Communication to E. Wintercorn, Department of Veterans Affairs.
  • Nelson Laboratories. Inc. (Salt Lake Citv. UT), "Final Report, Viral Penetration Study", Protocol No. 922721-1. (Laboratory No. 45904, 1992),
  • J. Overturf(Starkey Labs), "Determining the Percent Total Harmonic Distortion of the Earphone Cover" (Unpublished Study 1992).
  • L.J. Revit, Frye Electronics, Inc., Tigard, OR 97223 (Unpublished Data 1992).
  • K.A. Ullrich, "The Effects of the Earphone Cover on Pure Tone Hearing Thresholds" (Unpublished Study 1992).

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