why higher DB gain aid has similar results to another with a lower DB aid in practice?any other factor?

while in numbers some aids are higher in DB gain and feeting range in practice it is similar or lower than other aid with a theroritical lower numbers, does company matter? chanels? do i miss something?also why some models extreme costly having lower DB gain from way less costly?

The amount of power an aid produces isn’t really a cost factor.

The biggest defining factor for cost is the claimed performance in background noise/speech and the higher number of channels used to refine this process.

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