You've been misled by experiences with nasty commercial sound systems, and their inefficient distorted sound.
Just check out this post about an A/B test of cabinets: http://billfitzmaurice.com/phpBB2/viewtopic.php?f=13&t=4304&start=90&st=0&sk=t&sd=a
"I took them [DR200] to a Christmas party that is attended by about 60-70 people, 15-20 of which are musicians. One guy in particular, the keyboardist from my old 8-piece blues band, commented on how natural they sound. he said: It's just like listening to someone sing unamplified, only louder.
We also ran an acoustic through them that night (for those that have asked) and it was STELLAR! Very exciting to hear that."
What's "in" these cabinets?
Complex split folded horns that couple the speaker driver to move air (generate LOUD soundwaves) with minimal power input.
The DR200 + Titan 39 (full range) has a 10" driver for the subwoofer (!), 8" driver for the midrange, and a cross fired transmission line array made from inexpensive piezo tweeters. Based on user reports, they sound louder / better than a typical power sucking 18" subwoofer, 15" driver, compression horn system costing 10 times as much and needing 4 times the power.
Why aren't they made by commercial companies?
The woodwork is so labor intensive (DIY), that it's cheaper to build plain cubes that need kilowatts to drive them.
SPL chart: http://billfitzmaurice.com/phpBB2/viewtopic.php?f=12&t=1669
A DR200 measured at 1000 Hz, 103 dB/watt @ 1 M (input 2.83 V)
With 100 W amp, that adds 10 dB, resulting in 113 dB SPL. (A riveter generates 120 dB)
To put that into perspective, see chart: http://home.new.rr.com/trumpetb/audio/dBexamp.html
The right column lists "Professional sound reinf. equip, typ. all horn; 102 dB/watt "
Now, here's the "gotcha"... the 1000 Hz measurement is the LOW POINT.
The DR200 has 108 dB/Watt SPL at 150 Hz.
3 dB is a DOUBLING of sound pressure level.
So the DR200 has almost FOUR times the output as a "professional sound reinforcement" box for the same input.
The secret is the folded horn. Just as a trumpet makes "one lung power" into loud music, the folded horn makes modest speaker drivers into prodigious air movers.