"Up until this point, the concept of a small hi-fi speaker didn’t exist."
Really? I think Celestion might beg to differ. The Celestion 10 dates back to the 60s: 5" mid bass and HF1300 tweeter
i have to agree with Mr.Chris P. Didn´t had ever heard such a ridiculous sentence " ...,small hi-fi speaker didn´t exist."
You should look to some early 70´s speakers catalogs that are available for free on-line, i have Celestion ,JBL, Tannoy, Technics , Philips ,Kenwwod and Pioneer speakers from the 70´s.
There are litle and very big speakers from that decade, also being bigger doesn´t reflect the quality but only the type of speaker, all are hi-fi ,none of the brands refered had low-fi speakers .
maybe if not restored it might sound not that good today as they sounded when new with some use,
Speakers when new and never used they don´t have their maximum quality but only after some hours of working they do release their best sound.