Hearing Aid Recommendation for Advanced and Profound Hearing Loss

[Zebras]

@ierkamacar

@1Bluejay

Phonak Acoustic Phone Program

I think the answer is that the network bandwidth available back in the day for transmitting telephone signals was limited so to achieve maximum capacity for many customers, AT&T figured out that only a frequency range of about 3 kHz between about 400 to 3,400 Hz was needed.

Exactly how the acoustic phone program works.

All to do with frequency range.