Perplexed on how single driver speakers can cover such a large Hz range

It is the reason why the best headphone and the only one i like is a Hybrid with a dynamic cell specialized in bass and a electrostatic cell specialized in higher frequencies over 4,000 hertz the cross over slowly decreasing point for the two cells..And a grid of Helmholtz tuned resonators inside to clean bass and mid bass... it work so much well that none of my past 9 headphones compared one second to the K340... All are under my bed for eternity or for computer use... 😊

The AKG K340 can make a soundfield more defined and clearer than my speakers because of what atmasphere explained so well...

My room dedicated acoustic so well it was tuned , was limited by my Mission Cyrus speakers under 50 hertz...And their tweeter limitation and roll off..

When i lost my dedicated room i was sad... When i optimized this headphone i enter in sonic heaven anew but with no more too much acoustic limitations... A well optimized modified AKG K340 rival any headphone today... It is the only successful  hybrid headphone where one of the cell is not only a super tweeter as the dharma was..

Any designer in audio is an artist not only a scientist... because he must work and jugg with many trade-off at the same times... The designers who are not artist are not the great one , they apply a recipe...

As dynamiclinearity mentioned, at any given, whatever any driver is doing at any given time is a complex combination of many different frequencies albeit in a more limited way in a classic woofer, midrange or tweeter than a single driver design. It’s always amazing to me that this can occur & sound realistic. 
 

Even more amazing to me is that a single stylus in a phono cartridge can somehow do a similar but inverse thing &  react to the full range squiggles in a spinning vinyl disc & do so accurately!  Also similarly but not always true, the better cartridges can’t “ play loudly” either & general their outputs  are very low & require substantial amplification to be “heard”.  Thomas Edison was one smart dude!! 

@dlcockrum 

How?

@kokakolia 

You are obviously comparing single driver speakers to lower end multi driver speakers. Do you feel the same when comparing them to higher end speakers ?

I've heard a few systems with a single driver where I thought the sound was quite good, overall, and particularly good in certain aspects.  The single driver systems I liked were the Charney Audio Companion (particularly with the AER driver) and the Voxativ Ampeggio and Songer Audio S1.  Most of the others I heard had too rough and peaky upper midrange colorations; I did not mind as much the lack of really deep bass.  I agree with those above who say that using the full-range driver as a wide range driver in a multi-way system is a better application of such drivers. With the right wide-range driver, the crossover points can be set low enough and high enough to be out of the range where the ear is most sensitive to crossover anomalies.  Also, wide range drivers allow for the use of simpler crossovers with shallower slopes.

I've heard a number of successful custom builds using such drivers in multi-way system.  Many are custom-built systems using some fairly exotic Western Electric and Jensen drivers (like the field coil M 10 and M 18 drivers).  Among successful modern multi-ways are the two-way are the Cube Audio Nenuphar Basis (to me, MUCH better than their single driver systems), and the Songer Audio S2.  I've heard really nice horn-based systems where gigantic horns were used to allow a very low crossover such that the compression midrange was crossed over to the bass driver at 150 hz and the crossover to the tweeter was around 8,000 hz.  Even the best of these systems have compromises, of course, mostly in that they don't go extremely deep.  But, the speed, purity, liveliness and vivid quality of wide-range drivers used correctly makes such compromises worthwhile.