I'd be careful not to tie the overall sound of a component to one aspect of it's design.
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The late 70s/early 80s dogma (as advertised) was that 'When Z1Z3=Z2Z4 something magical happens'. Or something like that, knowing that about everbody reading that copy had no idea what they were talking about. Although Quad was in the day very old school, they were not above advertising BS.
Quad power amps traditionally have pretty good design, but with (especially) their later solid state ones, crapola parts.And a small cottage industry evolved improving the quality of the 405 components without changing any of the design.
Thanks to all who have responded so far, especially BW supplied the technical article which is dense. However, I think we can understand enough, that Quad has been resting on its laurels too long. Their speakers over the years have offered great sound, but at too a high price, and required demanding set-up parameters and almost monster amps to drive them. With all due respect to Quad's founders and designers I think the company has seen its day.