My apologies for snarking at Bose.

In my own experience (subjective), I do not find Bose worthy of praise.

However, 'loudness' is subjective and not measurable.

Sound pressure level (SPL) is an objective measure and useful for comparison.

To some people, Bose may sound wonderful. Especially when a salesman is subtly suggesting 'how good they sound'.

In a live sound reinforcement situation, the name of the game is sensitivity - the relationship between power in and audio out.

For folks who have to live with standard 120 VAC / 15 Amp circuits, it's nice to have a sound system that sips 'the juice' while pumping the air.

Frankly, I've had to adjust my thinking on a lot of audio tech, after reading about BFD speakers.

For example, the "sage wisdom" of pro sound suggests that a subwoofer will need 3 times the power as does the midrange, and the horn will take about 1/3 as much as the midrange.
So you might have to provide 300W/100W/30W power spread to each unit of a tri-amped system.

BFM speakers, especially the subwoofers, are so sensitive, that you don't need 3x the power for the subs. And since he uses Piezos for tweeters, you don't need a crossover, and thus save on another amp.

Thus (4) DR200 and (4)Titan 39 speaker set up may only require a stereo amp 2 x 200W for a balanced full range sound (40 Hz to 20 kHz).

Measured at 100 Hz (crossover point)
4 x DR200 = 115 dB SPL at 1 meter (2.83 v)
4 x T39 = 115 dB SPL at 1 meter (2.83 v)

(Interesting point - BF suggests that you never increase power to get louder. Add more cabinets first. Apparently folded horn speakers do not distort as readily, so users have been known to blow their speakers from overdriving them to destruction. There's no benefit from high power voice coils speakers, either. Apparently power compression occurs at such power levels and output does not increase.)