>You always lose gain (loudness) when you switch to the telecoil. My
>experience is that the sound run through the telecoil is never as loud as that
>through the microphone, and especially with your son's degree of hearing loss,
>he really may not hear anything through it.
>>Your report of using the speakerphone and turning it up is a common statement
>from the parents of kids with hearing loss, or they report just taking out the
>hearing aid and using an amplified phone.
>>The Siemens Infiniti 3 S1 has separate programming for the telecoil.
Gain, response and agc can be programmed independent of the mic
channel. Mixing of mic and telecoil channels is programmable. A few
of their other models have this capability also.