What creates the effortlessness in sound reproduction?


Hello, 
I have a chance to listen some speakers in the last 10 years. I notice that there are 2 speakers which produced sound 'effortlessly', even at low or high volume levels (I never tried max levels on them since they are not mine). With this effortlessness, listening to music is very relaxing. 

I wonder what makes the effortlessness in these speakers? 

Please shed some light on this. 

Thank you. 
Huy
Ag insider logo xs@2xquanghuy147
I think it could be efficiency, at least in the case of a pair of 99db efficient speakers I use (Klipsch Heresy IIIs). The sound gets thrown out from the speaker post haste. 
@wolf_garcia 

As others have pointed out, high efficiency drivers tend to have a lot less compression due to low power and low heat.

The coils and motors just don't heat up the same way.
What’s upstream driving the speakers is a major, MAJOR influence in the audio performance you wines ..... planning for system synergy and investing here first matters. 

the old adage still applies: “garbage in = garbage out“


There are about six or eight critical system factors that result in the "effortless" sound of speakers. It's a holistic system result, not just the speakers.   
effortless can mean different things to people. The only way to find out the answer is to become involved in speaker design. There are no shortcuts.