>>>When I get an optical jack installed into my noggin to bypass my ears, I'll agree with you... until then, it's the vibrations of the original musical instruments reproduced through the vibrations of the speakers that I hear, not the current running through wires!
Of course, literally, what you hear is coming out the speakers but it's reflective of what's it's hooked up to. It's a system afterall, a complex one at that, and everything is related.
>>>These trained ears have a hard time telling the difference between one good midrange CD player and a high end one in blind A/B tests... Don't even get me started on cables!
Depends on the conditions. If it's unideal, then that situation is more levelling to any component in the system. Since most people's systems are in not ideal situations, the reality is the difference is little. But when you put that one component in conditions which are better, it's usually easier to hear the differences between a better and lesser component.
It is hard to convince some people on cables, tweaks, etc. I won't argue about that. Those people that I invite over to my place can easily hear the differences in my system though.
>>>By the way, I know what you are talking about when you point to harsh treble being a problem in some CD players. That's a clever little trick the manufacturers are playing on you.
Maybe but in my modding and tweaking experience, the units just don't use better parts or designs.
>>>This is 100% related to the frequency response curve.
Frequency response isn't the only indication of quality. Lesser systems are less resolving.
>>>It's a lot easier to adjust an equalizer than it is to go through the menu screens on my new SACD/DVD player!
Maybe an analog EQ with knobs but not a digital one where you still have to go through a menu.
>>>Top end equipment is designed to reproduce frequencies people can't hear, dynamic ranges they will never be able to use without blowing their eardrums off, and power headroom that would shred the most rugged speaker voice coils.
That's just one philosophy. Top end equipment also makes frequencies you hear better. It's less harsh, there's more low level detail. This is usually the most obvious when I turn down the system very low. A top notch system can reproduce a low volume playback with still very fine detail.
>>>It's very easy to lose perspective on how much of a difference things make.
Well for me I disagree with those expensive components. Some people say they have upgraded to a better source and I hear that "better" one but it never sounds that much better to me. I believe more in tweaking and not in throwing a bunch of money to solve the problem. The problem to getting better and better sound is not in the component approach but a system wide approach. Any upgrading I'd do or recommend has to be upstream more toward the source.