If you read the manufacturer’s literature or read some of the forum comments by people who earn their living selling hearing aids, you are told that more is better. Is it really true that all these features, like echo block, adaptive directional microphones, wind noise reducers, etc. really translate into better speech comprehension?
Is there scientifically derived proof that these gadgets help? Or do they actually reduce comprehension?
For example, every one says that adaptive directional mikes are a must in noisy situations. Are they better than the lower cost fixed directional mikes?
This author reviews several actual tests of adaptive mikes and found they were no better than simple directional mikes.