Tone controls- to use or not?

I advice you not to do so

Your ears are already damaged, if you put gain on the trebble you will accelerate even more the déterioration

I mean at a stage you will be deaf even when people just speak !

Stay with your system as it is

Carl, get a hearing test done first. A hearing specialist can tell you what frequencies you have problems with and what things will agitate you or cause more damage. You would do the same for your eyes if you were having trouble reading, right?

Second, make sure sure your room acoustics fit what you need. Your difficulty with high end may be because it's being buried in echo or muddied by booming lows. The effect you describe in your second post sounds similar to the problem I was having at one point (blurry/unclear high end because of excessive corner echo). Play with your positioning and ask your dealer if you can try out a handful of acoustic treatments - you may be very surprised at the results.

If you still aren't satisfied, at least you have a better idea of where the problem lies and what the compensation options are.

Good luck!

Absolutely use the tone controls. The idea of purity of signal only applies if you have hearing in the normal range. If you don't, as most people don't at some point in their lives, then you are not hearing the music as it was intended anyway. Adjusting the strength at the frequencies that are attenuated by your physiology actually restores you to a point of listening to the music the way it was written. People forget that there each set of ears is part of a given system. I have often thought that a tweak that makes sense is to get a hearing test with a graph that shows the attenuation from normal over the audio range , take your music in a digital format and apply filters to overlay that graph so as to adjust the sound for your own hearing. You would end up with a very personalized recording. ALso a complex project that could be fun.

Most of high end preamps don't even have tone controls and all amps sold in Best Buy do. This alone should suggest something.

Tone control destroys imaging, clarity, and even tone. It changes harmonic structure by improper summing of harmonics (high quality constant group delay Bessel like adjustable filters ain't cheap).

Purists would also say that capacitors shouldn't even be in the signal path.

In addition - system should restore original concert performance. So here is the question: How do you adjust treble when you are at the concert?

Get your ears checked by a specialist. About 20 years ago J. Gordon Holt thought his HF hearing was going. Turned out he just had waxy buildup, which the ear/nose/throat specialist removed.