Bobby, the 3808 and the other receivers simply amplify the voltages that come in from the source materials; when set flat they certainly don't in any way reduce any "shrillness" that may be present in some of that material. Neither do accurate speakers such as the M60s degrade their own quality by making the shrillness less audible. The usual way to partially compensate for poor material is to turn the treble tone control on the receiver down a bit.
You may have heard these comments before, but there's no good reason to change them, since they're still true.
