Custom Earmolds
earmolds for BTE and body-worn hearing instruments, FM systems, and assistive listening devices
(ALDs). Please refer to other publications for information about EDI’s custom earmolds for
communication devices and custom hearing protection devices (CHPDs).

EDI’s custom earmolds are available in a variety of styles with a variety of options (such as venting or
tubing).

Earmold Selection and Fitting
The primary purpose of an earmold is to seal the amplified sound inside the ear. An earmold that does
not seal will permit sound to escape, resulting in acoustic feedback. To avoid this, an accurate
impression of the ear must be obtained and care must be taken to select an earmold style that is
appropriate for the client’s degree of hearing loss. Note that a “bigger” style is not always “better.” (See
chart, “Earmold Style Section Guide”)

Other factors also affect the choices of style (and options) for a particular client. These factors include:
the
specific anatomy of the ear being fitted, the nature of the hearing loss and the type of instrument or
device
being used.

Once the earmold style has been decided, selection of the proper acoustic options can maintain and/or
enhance the performance of the hearing instrument or device. (See chart, “Earmold Acoustic Options”)
For
example, venting, damping or horn coupling can have a significant effect on acoustic output. Venting
suppresses low-frequency output, while mid-frequency control is affected by damping. Horn coupling
effects enhance high-frequency output. (See chart, “Options Response Control”) Please refer to our
publications on options for detailed information.

Once the style and options have been chosen, custom earmolds are produced that acoustically perform
according to the intended purpose, fit comfortably, have good retention and are as aesthetically pleasing
as possible. Quality finished products reflect precision craftsmanship—a hallmark of EDI’s custom
earmolds.
Earmold Design, Inc., offers you the ultimate in
custom earmolds. Too often the words “Quality,”
“Craftsmanship” and “Product Integrity”
represent the past. At Earmold Design, pride in
product compels us to combine those ideals
with highly trained personnel and the latest in
materials and technology. The results are
custom-crafted earmolds of exceptional quality.
Custom Earmolds for Hearing Loss Devices
Mild to severe losses
•        Lightweight
•        Inconspicuous style

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#3—Shell
Moderate to profound losses         
•        Our most popular earmold
•        Excellent for children

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#3/4—Three-Fourths Shell
xx losses

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#4—Half-Skeleton
Mild to severe losses
•        When full retention is not required, and/or the bowl of the ear is convex

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#5—Canal with Tail
Mild to severe losses
•        Tail on canal assists in retention, or can be used as a removal handle

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#51/2—Half-Shell
Mild to severe losses
•        Solid material through half the concha bowl
•        Good option for helix problems

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#6—Canal
Mild to profound losses
•        Excellent choice for severe to profound losses when made of Softech silicone
•        Not recommended when ear canal is small, narrow or short

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#9—Vogel
Severe to profound losses
•        Made with heat-cured acrylic (HCA) base and Softech silicone canal tip
•        Excellent for TMJ, difficult fittings and allergy cases
•        Acoustic seal is past the second directional bend (reduces occlusion effect)

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#10—Patriot™
Moderate to profound losses

•        Made with E-Compound™ silicone canal tip
•        Hollow canal enhances comfort
•        Excellent for TMJ, difficult fittings and allergy cases
•        Acoustic seal is past the second directional bend (reduces occlusion effect)

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#11—MCT™
Moderate to severe high-frequency losses
•        Minimal Contact Technology (MCT) reduces contact with aperture and first bend of the
canal
•        Available in E-Compound™ silicone
•        Acoustic seal is past the second directional bend (reduces occlusion effect)

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BTE Acoustically-Tuned Earmolds
Earmolds designed to be non-occluding (without the canal extension)—helps to maximize
speech intelligibility, and minimize feedback and unwanted background “noise.”

#14—2HF
High-frequency losses and CROS/BiCROS systems

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#15—2HF-B
High-frequency losses and CROS/BiCROS systems
•        Same as #14 but with bridge that extends from aperture to anti-helix (creating more
stability)

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#16—2HF-E
High-frequency losses and CROS/BiCROS systems
•        Made with canal extension that “helps” tubing direction

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#17—2HF-BE
High-frequency losses and CROS/BiCROS systems
•        Same as #15 but with canal extension that “helps” tubing direction
•        Also used for Fluency Master (stuttering)

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#18—Lybarger
High-frequency losses and CROS/BiCROS systems
•        Uses 1/32" tubing (reduces receiver output in 800–2500 Hz range)
•        Dual-diameter tubing (provides about 12dB boost in 4k–7k Hz range)

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Special Feature Earmolds
Available for earmold styles #2, #3, [#3/4?], #4, #5, #51/2 and #6.
(Illustrated here in the #2—Skeleton style.)


#20—Sound Separator
Normal low-frequency hearing with progressively greater losses in high-frequency ranges
•        Canal removed and aperture scooped out (“fish mouth”)
•        Provided with SAV (Select-A-Vent) set

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#21—Sound Separator Extended
Borderline low-frequency losses with moderate to severe losses in high-frequency ranges
•        Same as #20 but with canal extended (improves “gain before feedback” results
•        Provided with SAV (Select-A-Vent) set

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#22—Elegance I
Normal low-frequency hearing with precipitous high-frequency losses
•        Vent portion of canal trimmed back to aperture (similar to IROS vent)
•        Provided with SAV (Select-A-Vent) set with #13 tubing

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#23—Elegance II
Same as #22 but SAV is with 3mm horn—provides 8–10 dB boost above 2000 Hz

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#24—Elegance III
Same as #22 but SAV is with 4mm horn—provides 10–12 dB boost above 2000 Hz