I’m not really sure of the question. Yes, really old movies do not have not very good sounding sound tracks. The restoration on North by Northwest was phenomenal, both video and audio, the reason it sounds good.
Our home theater has B&W 805 for all five channels. They are great speakers and very faithfully reproduce whatever is on the disk. The center is the exact same speaker… except constructed as a center. As it should be since 85% of the sound in HT comes from the center. It is not just the speakers, top notch electronics are needed to get the best sound.
i have been noticing over the years more and more the rear channels carry real bass and volume and not just bullet sounds any more.