That's because you and Brad are thinking only from a horn driver point of view. If tone is there in a recording, it can be got back in...part of the reason I think that video does not have right tone is recording and electronics. All he needs to do is play a good recording and add a good phono - he is anti-valve though and he tries to create a Spectral sort of sound with his own electronics which is not working for him at the moment, imo.
Firstly I am not thinking of horns or horn drivers. This applies to any situation.
Secondly if tone is there in the recording, poor speakers can and will lose it.
A good hifi system is for sure crap in crap out - I agree on that. But if you put great in, you don’t necessarily get great out. The transducers themselves are highly influential of system tone. This is one of the reasons that many people spend endless sums of money chasing their tail trying to make their speakers something they just can’t be.