Adaptation of Open Fit with CRT

The last post detailed the benefits of Open Fit technology. There are limitations; 1) feedback because of too much sound leaking out of the ear canal, and 2) a traditional Open Fit device is not able to give enough gain to satisfy those with a moderate or severe hearing loss - the result can be feedback (see #1). Open Fit technology using new Canal Receiver Technology (CRT) puts the receiver down into the eartip located deep in the ear canal. This allows the sound to enter deeper in the canal and reduces the likelihood of feedback. Other sizes of generic eartips and even custom earmolds can be made around the canal receiver to achieve an even better fit and acoustic seal. The benefit is that someone with greater degrees of hearing loss can now use the smaller Open Fit devices without having to resort to larger, more noticeable behind-the-ear devices.
These devices are made under names like Phonak MicroPower, Unitron Moxi, ReSound Azure, Sebotek, and others.