What happens when the receiver doesn’t match what the software thinks?
If you have a NP receiver on a hearing instrument configured as HP, you get LESS gain than you see on the fitting screen. You are under-fitting.
If you have a HP receiver on a device configured as NP, you get MORE gain than you see on the fitting screen. You are over-fitting.
The graph below shows the effects on gain. The two curves in the middle of the graph that are on top of each other are for NP and HP configured correctly to the receiver. The programmed gains were the same for all of these measurements, so if it made no difference how the device was configured, then they all would have been on top of each other.
