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To benefit from a telecoil in a hearing loop it needs to be a vertically oriented as worn on the ear – something that can be handled for use on the phone by modifying the position of handset - and the telecoil has to have a frequency response that closely matches the microphone sensitivity at equal input levels for the speech frequencies (60 dB SPL vs. 31.6 mA/m inputs) – something called transparency. In other words: When you switch from mic to T setting the hearing aid should sound the same (meaning have the same frequency response) and be equally... Read more