??? I'd beg to seriously co differ with you on that one bro.
Yes the Quads could always deliver extremely detailed and mostly smooth midrange but,
they could never play louder that a good pair of headphones, had llimited bass response, a rolled off top, and would never have lasted
a week in my rig till I had lightning bolts shooting across the panels. LOL
Well - all I can say is that in the 15 years I owned them, and in the homes and systems in which I ran them, they never lacked for loudness
Low bass yes - but like anything it depends on your priorities.
The transparency and midrange purity is far beyond what the vast majority of speakers can achieve... not to mention that distortion is also substantialy beyond (below) what most standard speakers are capable of... (which is probably part of the transparency and purity recipe!)
And yes - they need to be positioned right, in the right kind of room, etc, etc, (but that is like any speaker!)
If you want an even better midrange, with even more extreme limitations in other ways - the earlier ESL57's do that - more limited bass, more limited highs, much more limited SPL's - but the most lifelike midrange I have ever heard - no exceptions.
There is no such thing as a perfect speaker - you have to choose the limitations you are willing to live with.
To many people, bass slam is king, often along with high SPL's.
To me a true to life midrange, and the ability to reproduce acoustic instruments (recorded right... which is itself rare!), as if they are there.... I find very few speakers can achieve that, and that is my #1 criteria.... I listen at typically 72db at my listening seat - so peaks of circa 92db are what needs to be achieved - and the Quad 63's achieved that with ease. (the later 989's that I also owned, filled out the bass a bit more...)