Most top-range hearing aids have some kind of noise reduction system. But noise reduction strategies vary from manufacturer to manufacturer.
A recent investigation has shown that most noise reduction systems simply dampen the low frequencies to reduce noise. The risk involved in doing this is that speech cues can also be dampened along with the background noise
The Widex Speech Enhancer system, on the other hand, is able to reduce noise so that it is under the hearing threshold of the listener while at the same time boosting regions with speech by applying extra gain in these regions.