Bob, it's a shame that the only time the consumer sees the specs on hearing aids is AFTER they are purchased. The user guide for my Resound Linx3d's do list technical specifications. Fortunately, we can google the specs to find out what they mean. You say that your hearing may have diminished due to the constant exposure to amplified sound. It's hard to know for sure. I was born with mild loss but am in the profound range now. I did not get a hearing aid until I was 20 and then 21 for my other ear. I only hope that the hearing aids did not contribute to the loss I now have.
Tony