I'm 42 years old and never been diagnosed with any hearing problems. I have not worked in an industry where hearing damage can be caused. But every time I listen to music - whether it be on a PC, hi-fi separates system, in-car stereo, I always want to turn the treble control (when there is one) up, because otherwise things just sound so, well, flat and muffled. To me, turning up the treble makes music sound 'crisp' if you know what I mean - the crash of a cymbal sounds, for example, more like it does in real life, to my ears. Now I am aware that it appears to be sacrilege and somewhat embarrassing to admit using tone controls on a serious hi-fi forum, and I know there are posts about this already. but this is not one of those "I secretly use tone controls, do you still love me" kind of threads - I'm seriously wondering if my hearing might be deficient, given this need I seem to have to crank up the higher frequencies to arrive at a pleasant listening experience. Any thoughts?