Boldface Type, I gave my cites at the bottom of the post. Most of your issues will be addressed there.
I’m not a huge fan of online cites, unless there’s no other option. Frankly, it’s not really worth my time to have an argument with someone who’s incapable of using a library card, but here goes:
One example of a cartridge designed to reproduce outer limit frequencies, the ones you claim aren’t really in use:
http://www.audiophile.com.au/grado_specs/ref_mastspecs.html
Obviously, you don’t need a cartridge capable of reproducing frequencies from 10 to 60,000 hertz unless there’s a possibility of using them. And this is not atypical; a search on Yahoo on vinyl + cartridges + retail will turn up many, many more results.
And it doesn’t stop there. How about phono preamps?:
http://www.vxm.com/tone.sunfirepreamp.html
Why would you need a frequency response of 5 to 50,000 hertz in the phono stage unless the format was able to reproduce those frequencies?
And here’s an audio engineer who routinely reworks audio recorders to get great specs:
http://www.ear-usa.com/timdeparavicini.htm
Of specific interest:
“Although de Paravicini will upgrade any tape machine, his favorite is the legendary Studer C37…after de Paravicini’s modifications, the response is 7 Hz to 35 kHz, +/- 1 dB, and S/N is 90 dB!”
No need to do it unless there’s a format that can attempt to capture the sound of the tape. That would be vinyl, for now.
The problem with your assertions above is that they imply the inherent lack of doctoring in any mastering process in any format. Again, check any mastering-centered interviews with Bob Ludwig, or, frankly, any mastering engineer. It’s not like they’re sacrificing chickens to get results.
I’ll even help:
http://emusician.com/ar/emusic_masters_mastering/
or:
http://www.musictap.net/Interviews/LudwigBobInterview.html
I’d also recommend hunting a bit on prosoundweb.com, too.
I’m done hijacking this thread. In my opinion, the best U2 album was The Unforgettable Fire.