Which type of hearing aid coupler is associated with BTE (Behind-The-Ear) models?

The HA-2 coupler is specifically designed for use with Behind-The-Ear (BTE) hearing aids. This type of coupler is made to accommodate the way sound is delivered from a BTE hearing aid, which generally has a tube that directs sound into a custom ear mold or an ear canal.

The HA-2 coupler is important in the assessment and verification of BTE hearing aids, as it allows for accurate measurement of the output and performance of the device. When testing or fitting BTE models, using the appropriate coupler ensures that clinicians can provide precise adjustments to optimize the hearing aid's performance for the user.

In contrast, the HA-1 coupler is more suited for in-ear models that are less robust than BTEs, while "Custom HAs" and ITE devices refer to different styles of hearing aids that employ different fitting strategies and may not use the HA-2 coupler. Therefore, the specific design and function of BTE hearing aids align accurately with the use of the HA-2 coupler, making it the correct choice for this question.