A full range speaker?

I have my full range for the moment, thanks. What I'm wondering is what you define that as, and why, and speaker mentions are optional. 

In opposition to speaker manufacturers saying anything below 60hz, depending on manufacturer, can be full range. Looking for personal statements so that we can see what people think that is.

When I was younger, the first full Range speakers I heard were K-Horns, and after that I started to realize that a lot of floor standing full range speakers were just really large bookshelf speakers…

I’ve always understood full range to be 20hz - 20khz very few passives unless they are pretty large can do full range. I don't know of any that will do full range with an FR that looks decent without PEQ preferably DSP. 

I think the the 20's are the domain of plate amps. Some manufacturers are now including them in their full range speakers to drive the big woofers.

Something I have seen that seems like a good idea is a built in high pass filter on a preamp. This is something that should be a given, as all that comes from passing tones lower than your speakers can reproduce is distortion, and wasted power. What's the point of your amp receiving that info and wasting energy trying to reproduce it if your speaker can’t reproduce it? I think the Parasound Halo has that, although some people may frown on that as being marginally worthy of being lumped in with audiophile equipment. But I’m more like Steve Gutenberg and Herb Richert in my inclusiveness of trying to find a decent system for people that can only afford say a grand on their system.

But I digress…

Full range is a quadratic equation. If your mids and tweets are 100 watts, your subs have to have 800 watts and four times the surface area of the mid’s. 
And this is an area where class D amps don’t cut it, in my experience; so double that to 1600 watts RMS for 20- 80 hz.