In reply to:
The Denon actually might have trouble running those M80's at sustained high volume . The Denon is only rated stable to 6 ohms
The rating is moot.
The Denons have been tried and true with the M80s for quite some time now which is why Axiom recommends them (along with H/K).
You cannot compare what the Thiels may do to a receiver against the M80s. They are not the same speaker regardless of the listed average ohm rating.
In reply to:
As a firm believer in break-in and the proud owner of M22's and M3's .... I test all speakers before and after and IMO they both definately benefitted from a wee bit of break in.
Like so many others have gone before you, they all conclude that speakers break-in without having accounted for the largest variable in the listening test...their own mental preconceptions.
You cannot control this consciously.
That is why Axiom uses blind tests for such experiments and have concluded the following.
These are not casual listening tests but are experimental results from a controlled setting. The general theory on break-in is fundamentally flawed as the experimental process for concluding the results as fact did not cover a major influencing variable.
A submitted paper for publication with such an experimental design would get tossed into the "completely unacceptable" pile. Return to writer with suggestions on redoing the experiment.