Here is a question from the first chapter of the last guide I listed, the ETS. I was sure I knew this. But my choice is not the right one, so I am taking a poll!
Which of the following earmold modifications would increase the amount of high frequency gain provided by a behind-the-ear hearing aid/earmold combination?
A) Gradually increasing the tubing diameter from earhook to canal tip
B) Gradually decreasing the tubing diameter from earhook to canal tip
C) Increasing the length of tubing from earhook to canal tip
D) Drilling a pressure release vent in the earmold
E) Adding a 1200 Ohm filter in the earhook
Well, people, which do you
think it is?