the two Quads are not mixed alike, so whether you're using an old Quad Receiver or a more modern AVR, or have a Centre speaker or not, or are using a Subwoofer or not, or are using Bass Management or not, is irrelevant when comparing the Quads of "Blow By Blow" and "Wired" to one another because the two Quads are not mixed in the same way.
This is beyond pedantic, it is in the realm of willfully obtuse. It is dogged mountain-building from a molehill.
Sir, it is indisputable that both of these Jeff Beck album quad mixes often place his lead guitar in a rear channel, for extended periods of time. I'm not a fan of that.
However, my opinion on such 70s quad 'mix philosophy' aka 'approach to mixing' aka 'mixing decisions' was not even close to being my main topic in that post about Wired. It was a aside, as in 'Misgivings about the mix itself aside" as I literally wrote in the post . Other than glancing on the indisputable fact that I note above, I have no concern for Blow By Blow at all in this particular investigation. And I was definitely not 'comparing them to one another' beyond that side note.
What I was comparing, was the sound of Wired, on my system, when the LFE and C are silenced, vs not.