What exactly is insertion gain?

[Ivo Merks]

In an article I came across the term "insertion gain". Is it the same
as insertion loss and how does the insertion gain relates to the "normal"
gain of the hearing aid?

Any pointer or explanation is welcome.

Ivo
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I.L.D.M. (Ivo) Merks, e-mail: ivo at dutnak2.tn.tudelft.nl tel:(31)(0)15-2782021
Acoustics Group, Department of Applied Physics   home phone:(31)(0)15-2624160 
Delft University of Technology, the Netherlands
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