Abstract: The present invention provides system for shaping at least a foam portion of an earpiece, the system including a sizer configured to receive at least the foam portion of the earpiece such that at least the foam portion of the earpiece is reduced in size before being placed into an ear of a user, wherein the sizer includes a hollow structure having an open first end and a second end, wherein the first end has a first cross-sectional area, wherein the second end has a second cross-sectional area, and wherein the first cross-sectional area is larger than the second cross-sectional area.

Abstract: The present invention provides a sound attenuation system that includes a base having a first portion on an emitter end of the base and a second portion on a receiver end of the base, wherein the first portion has a first longitudinal axis, wherein the second portion has a second longitudinal axis, and wherein the first longitudinal axis is at a first angle to the second longitudinal axis; an adapter having a first end and a second end; a sound-attenuation plug, wherein the first end of the adapter is configured to couple to the sound-attenuation plug, and wherein the second end of the adapter is configured to couple to the first portion of the base; and a receiver-end component configured to insert into the second portion of the base.

Abstract: A sound attenuation system can include a first end that can include a shaft and a flange, the flange can be coupled to the shaft, and a second end that can include a filter stem and a cap. The filter stem can have a hole. The cap can have a first position in which the cap occludes the hole and can have a second position in which the cap is clear of the hole.

Abstract: A sound attenuation system can include a first end that can include a shaft and a flange, the flange can be coupled to the shaft, and a second end that can include a filter stem and a cap. The filter stem can have a hole. The cap can have a first position in which the cap occludes the hole and can have a second position in which the cap is clear of the hole.

Abstract: A sound attenuation system can include a first end that can include a shaft and a flange, the flange can be coupled to the shaft, and a second end that can include a filter stem and a cap. The filter stem can have a hole. The cap can have a first position in which the cap occludes the hole and can have a second position in which the cap is clear of the hole.