called sound response curve the present invention obtains this result by the forming of a sound vent tube 86 along the length of the assembled members 22 24 and 26 and as provided for by the pouring of the acrylic material therearound thus an elongated cylindrical member not shown is mounted in engagement with the outer surfaces of the members during the pouring of the acrylic material therearound and is thereafter removed from the assembly to form the vent tube 86 the vent tube 86 extends longitudinally through the shell so as to have access to the auditory canal and acts to vary the sound response requirements of the user depending upon his particular needs it is understood that by assembling the members in the manner as described an exact fitting of the hearing aid can be accomplished and the components of the hearing aid can be preassembled to reduce the time required for the manufacture of the unit the preassembling of the components in the manner as described also insures that the components will be resistant to shock in use thereby substantially eliminating the shorting of the wiring therebetween further by forming the members in a manner that enables them to be preshaped to conform to the negative impression as formed from the auditory canal of the user 39 s ear the assembly can be easily and quickly placed into the negative impression of the mold and the shell poured therearound to accomplish the exact and precise fit required for comfortable and effective use although not illustrated it is understood that.