Experiences moving from high-power to lower-power system

One thing I can tell you is that you don't have to sacrifice anything by getting more efficient and easier to drive speakers! I've yet to hear anything with more resolution and my speakers go down flat to 20Hz. The are 98 db, so I don't need a lot of power. I usually run them with 60 watt tube amps, which allow me nearly unlimited volume levels. I am very used to going over to friend's houses and hearing systems with 800 watts and realizing that by comparison, their systems are smaller and less capable because they lack the dynamic range and resolution.
That old adage about smaller amps sounding better may apply;  certainly if you are careful you won't miss the more powerful/less able amplifiers! The trick is the speaker...

Ralph, how would your speakers sound with 800 watts of tube power ? Or it would just be a waist of electricity and tubes ?

I don't understand speaker specs and such but I understand the concept that some can be driven effectively with lower watts (efficient) while others take more watts (less efficient).

So, does efficiency have any bearing on SQ across the board?

Does a more efficient speaker necessarily sound better at lower volume than a less efficient one.

I've heard that my speakers (Aerial Acoustic 7B towers) are not efficient and require a lot of power. To me they sound good at low volume but I have nothing to compare them to.

https://www.galaxyaudio.com/education/efficiency-vs-sensitivity