Does my amp have enough juice to power my speakers?

Horns such as the classic Klipsch  can sound excellent .The Key
is getting rid of the stock crossover and putting in Quality 
capacitors, inductors,resistors and wiring . A Night and Day
better more coherent speaker . This too applies to most speakers ,
especially under $10k. I have been modding Loudspeakers and 
electronics a Loong time and a pretty accurate statement.

udog
Having just read a review in Stereophile of my Audio Physic Step Plus speakers. The author states that his Shindo Haut-Briton Power amp (20wpc) couldn’t drive the Step

I believe it, a 20w tube amp, and knowing Japanese probably very low feedback.

Audio Physic Step having been tested at only 84db efficient, and with an impedance/phase curve (linked)
The one in the Stereophile review I believe "y" axis maybe a misprint.

This must be another one they did, and could be the right one.
3ohms from 150hz to 400hz and then 5ohms with -45 negative phase angle.
https://www.stereophile.com/images/119APStepfig1.jpg

Cheers George

My modified Klipsch Lascalas do not need much power, but when I listen to certain music, at certain levels ( 100db peaks and above ), my ears do appreciate a larger, higher wattage amp. My ears check out fine, btw. Of course I am talking about good clean watts. The playback of cannon shots and explosions ( an example would be from Roger Waters " Amused To Death ", etc., definitely satisfies me more with larger output amps, and needless to say, my system handles it beautifully. Chamber music and some Jazz trios do great with any smaller amp I have, but there is still a " heft " and a " meat on the bones " thing going on with a larger amp. FYI, I drive all of my amps passively. Enjoy ! MrD. 

Well, that was fun.  Kind of all over the map.  I'm confused.  So you are running these speakers with the Line Magnetics.  And they sound heavenly, except when they don't.

How about the room dynamics?  Is the room over damped?  Line Magnetics makes a fine product and the 22 watts is surprisingly strong.  How far away are you sitting?  Do you need ear bleed levels?  What time of the day/night does it sound heavenly?

Inclined to agree power quality is better at times and worse at times.

At 100 db you ears will check out bad one of these days .
The greatest jump in doc numbers is ear guys which have increased
10X since the 60's . Young docs know that's the sure road to wealth
for doing little or nothing .