Mid States Laboratories Inc.


The hearing instrument dispenser has developed a great
utilization of the “earmold” as an integral part of the fitting
system. The modification of the earmold or the shell allows for
enhancement of many acoustical qualities and can lead to greater client satisfaction.

The following graph indicates how earmold modifications can influence the frequency response of a hearing aid.

Click on any of the links below to learn more about the types of modifications we provide here at Mid-States.


Learn how to make simple physical adjustments to the earmold to perfect the fit in your office.

Tube Changes

The need to replace tubing is something that needs to be done as dictated by numerous factors with a 3 to 4 month time period as a general schedule. For details and hints on how to replace a tube, see this secton.


Learn about the three types of vents, their unique benefits, and the effects they can have on an earmold.

Horn Coupling

Horning or trumpeting is a technique used to emphasize the high frequencies in a hearing aid to create a “Horn” in the end of the earmold.


Attenuators used in conjunction with earmold modification influence the center frequencies. The amount of effect is determined by the density of the attenuator or damping plug, the number of attenuators used, and the location in the system.

| 600 N. St. Francis | P.O. Box 1140 | Wichita, KS 67201 | P 316.262.7013 | Toll Free 800.247.3669